class assignments in java

Java Tutorial

What is Java
History of Java
Features of Java
C++ vs Java
Hello Java Program
Program Internal
How to set path?
JDK, JRE and JVM
JVM: Java Virtual Machine
Java Variables
Java Data Types
Unicode System

Control Statements

Java Control Statements
Java If-else
Java Switch
Java For Loop
Java While Loop
Java Do While Loop
Java Continue
Java Comments

Java Programs

Java object class.

Java OOPs Concepts
Naming Convention
Object and Class
Constructor
static keyword
this keyword

Java Inheritance

Inheritance(IS-A)
Aggregation(HAS-A)

Java Polymorphism

Method Overloading
Method Overriding
Covariant Return Type
super keyword
Instance Initializer block
final keyword
Runtime Polymorphism
Dynamic Binding
instanceof operator

Java Abstraction

Abstract class
Abstract vs Interface

Java Encapsulation

Access Modifiers
Encapsulation

Java OOPs Misc

Object class
Object Cloning
Wrapper Class
Java Recursion
Call By Value
strictfp keyword
javadoc tool
Command Line Arg
Object vs Class
Overloading vs Overriding

Java String

What is String
Immutable String
String Comparison
String Concatenation
Methods of String class
StringBuffer class
StringBuilder class
String vs StringBuffer
StringBuffer vs Builder
Creating Immutable class
toString method
StringTokenizer class
Java String FAQs

Java String Methods

String charAt()
String compareTo()
String concat()
String contains()
String endsWith()
String equals()
equalsIgnoreCase()
String format()
String getBytes()
String getChars()
String indexOf()
String intern()
String isEmpty()
String join()
String lastIndexOf()
String length()
String replace()
String replaceAll()
String split()
String startsWith()
String substring()
String toCharArray()
String toLowerCase()
String toUpperCase()
String trim()

Exception Handling

Java Exceptions
Java Try-catch block
Java Multiple Catch Block
Java Nested try
Java Finally Block
Java Throw Keyword
Java Exception Propagation
Java Throws Keyword
Java Throw vs Throws
Final vs Finally vs Finalize
Exception Handling with Method Overriding
Java Custom Exceptions

Java Inner Class

What is inner class
Member Inner class
Anonymous Inner class
Local Inner class
static nested class
Nested Interface

Java Multithreading

What is Multithreading
Life Cycle of a Thread
How to Create Thread
Thread Scheduler
Sleeping a thread
Start a thread twice
Calling run() method
Joining a thread
Naming a thread
Thread Priority
Daemon Thread
Thread Pool
Thread Group
ShutdownHook
Performing multiple task
Garbage Collection
Runtime class

Java Synchronization

Synchronization in java
synchronized block
static synchronization
Deadlock in Java
Inter-thread Comm
Interrupting Thread
Reentrant Monitor

Java Networking

Networking Concepts
Socket Programming
URLConnection class
HttpURLConnection
InetAddress class

Java Applet

Applet Basics
Graphics in Applet
Displaying image in Applet
Animation in Applet
EventHandling in Applet
JApplet class
Painting in Applet
Digital Clock in Applet
Analog Clock in Applet
Parameter in Applet
Applet Communication

Java Reflection

Reflection API
newInstance() method
creating javap tool
creating appletviewer
Call private method

Java Conversion

Java String to int
Java int to String
Java String to long
Java long to String
Java String to float
Java float to String
Java String to double
Java double to String
Java String to Date
Java Date to String
Java String to char
Java char to String
Java String to Object
Java Object to String
Java int to long
Java long to int
Java int to double
Java double to int
Java char to int
Java int to char
Java String to boolean
Java boolean to String
Date to Timestamp
Timestamp to Date
Binary to Decimal
Decimal to Binary
Hex to Decimal
Decimal to Hex
Octal to Decimal
Decimal to Octal
JDBC Introduction
JDBC Driver
DB Connectivity Steps
Connectivity with Oracle
Connectivity with MySQL
Access without DSN
DriverManager
PreparedStatement
ResultSetMetaData
DatabaseMetaData
Store image
Retrieve image
Retrieve file
CallableStatement
Transaction Management
Batch Processing
RowSet Interface
Internationalization
ResourceBundle class
I18N with Date
I18N with Time
I18N with Number
I18N with Currency
Java Array Class
getBoolean()
getDouble()
getLength()
newInstance()
setBoolean()
setDouble()
Java AtomicInteger Class
addAndGet(int delta)
compareAndSet(int expect, int update)
decrementAndGet()
doubleValue()
floatValue()
getAndAdd()
getAndDecrement()
getAndSet()
incrementAndGet()
getAndIncrement()
lazySet(int newValue)
longValue()
set(int newValue)
weakCompareAndSet(int expect,int newValue)
Java AtomicLong Methods
addAndGet()
compareAndSet()
weakCompareAndSet()
Java Authenticator
getPasswordAuthentication()
getRequestingHost()
getRequestingPort()
getRequestingPrompt()
getRequestingProtocol()
getRequestingScheme()
getRequestingSite()
getRequestingURL()
getRequestorType()
setDefault()
Java BigDecimal class
intValueExact()
movePointLeft()
movePointRight()
Big Integer Class
bitLength()
compareTo()
divideAndRemainder()
getLowestSetBit()
isProbablePrime()
modInverse()
nextProbablePrime()
probablePrime()
shiftLeft()
shiftRight()
toByteArray()
Java Boolean class
booleanValue()
logicalAnd()
logicalOr()
logicalXor()
parseBoolean()

Java Byte Class

byteValue()
compareUnsigned()
parseByte()
shortValue()
toUnsignedInt()
toUnsignedLong()
asSubclass()
desiredAssertionStatus()
getAnnotatedInterfaces()
getAnnotatedSuperclass()
getAnnotation()
getAnnotationsByType()
getAnnotations()
getCanonicalName()
getClasses()
getClassLoader()
getComponentType
getConstructor()
getConstructors()
getDeclaredAnnotation()
getDeclaredAnnotationsByType()
getDeclaredAnnotations()
getDeclaredConstructor()
getDeclaredConstructors()
getDeclaredField()
getDeclaredFields()
getDeclaredMethod()
getDeclaredMethods()
getDeclaringClass()
getFields()
getGenericInterfaces()
getGenericSuperClass()
getInterfaces()
getMethod()
getMethods()
getModifiers()
getPackage()
getPackageName()
getProtectionDomain()
getResource()
getSigners()
getSimpleName()
getSuperClass()
isAnnotation()
isAnnotationPresent()
isAnonymousClass()
isInstance()
isInterface()
isPrimitive()
isSynthetic()
Java Collections class
asLifoQueue()
binarySearch()
checkedCollection()
checkedList()
checkedMap()
checkedNavigableMap()
checkedNavigableSet()
checkedQueue()
checkedSet()
checkedSortedMap()
checkedSortedSet()
emptyEnumeration()
emptyIterator()
emptyList()
emptyListIterator()
emptyNavigableMap()
emptyNavigableSet()
emptySortedMap()
emptySortedSet()
enumeration()
frequency()
indexOfSubList()
lastIndexOfSubList()
newSetFromMap()
replaceAll()
reverseOrder()
singleton()
singletonList()
singletonMap()
synchronizedCollection()
synchronizedList()
synchronizedMap()
synchronizedNavigableMap()
synchronizedNavigableSet()
synchronizedSet()
synchronizedSortedMap()
synchronizedSortedSet()
unmodifiableCollection()
unmodifiableList()
unmodifiableMap()
unmodifiableNavigableMap()
unmodifiableNavigableSet()
unmodifiableSet()
unmodifiableSortedMap()
unmodifiableSortedSet()

Java Compiler Class

Java Compiler
compileClass()
compileClasses()

CopyOnWriteArrayList

Java CopyOnWriteArrayList
lastIndexOf()

Java Math Methods

Math.round()
Math.sqrt()
Math.cbrt()
Math.signum()
Math.ceil()
Math.copySign()
Math.nextAfter()
Math.nextUp()
Math.nextDown()
Math.floor()
Math.floorDiv()
Math.random()
Math.rint()
Math.hypot()
Math.getExponent()
Math.IEEEremainder()
Math.addExact()
Math.subtractExact()
Math.multiplyExact()
Math.incrementExact()
Math.decrementExact()
Math.negateExact()
Math.toIntExact()
Math.log10()
Math.log1p()
Math.expm1()
Math.asin()
Math.acos()
Math.atan()
Math.sinh()
Math.cosh()
Math.tanh()
Math.toDegrees
Math.toRadians

LinkedBlockingDeque

Java LinkedBlockingDeque
descendingIterator()
offerFirst()
offerLast()
peekFirst()
pollFirst()
Java Long class

LinkedTransferQueue

Java LinkedTransferQueue
spliterator()
Difference between Array and ArrayList
When to use ArrayList and LinkedList in Java
Difference between ArrayList and Vector
How to Compare Two ArrayList in Java
How to reverse ArrayList in Java
How to make ArrayList Read Only
Difference between length of array and size() of ArrayList in Java
How to Synchronize ArrayList in Java
How to convert ArrayList to Array and Array to ArrayList in java
Array vs ArrayList in Java
How to Sort Java ArrayList in Descending Order
How to remove duplicates from ArrayList in Java
Java MulticastSocket
getInterface()
getLoopbackMode()
getNetworkInterface()
getTimeToLive()
joinGroup()
leaveGroup()
setInterface()
setLoopbackMode()
setNetworkInterface()
setTimeToLive()
Java Number Class

Java Phaser Class

Java Phaser
arriveAndAwaitAdvance()
arriveAndDeregister()
getParent()
awaitAdvanceInterruptibly()
awaitAdvance()
bulkRegister()
forceTermination()
getArrivedParties()
getRegisteredParties()
getUnarrivedParties()
isTerminated()

ArrayList Methods

listIterator()
removeRange

Java Thread Methods

currentThread()
getPriority()
setPriority()
setDaemon()
interrupt()
isinterrupted()
interrupted()
activeCount()
checkAccess()
dumpStack()
getStackTrace()
enumerate()
getThreadGroup()
notifyAll()
setContextClassLoader()
getContextClassLoader()
getDefaultUncaughtExceptionHandler()
setDefaultUncaughtExceptionHandler()

Java Projects

Free Java Projects
Payment Bill(JSP)
Transport (JSP)
Connect Globe (JSP)
Online Banking (JSP)
Online Quiz (JSP)
Classified (JSP)
Mailcasting (JSP)
Online Library (JSP)
Pharmacy (JSP)
Mailer (Servlet)
Baby Care (Servlet)
Chat Server (Core)
Library (Core)
Exam System (Core)
Java Apps (Core)
Fee Report (Core)
Fee (Servlet)
eLibrary (Servlet)
Fire Detection
Attendance System
Fibonacci Series in Java
Prime Number Program in Java
Palindrome Program in Java
Factorial Program in Java
Armstrong Number in Java
How to Generate Random Number in Java
How to Print Pattern in Java
How to Compare Two Objects in Java
How to Create Object in Java
How to Print ASCII Value in Java
How to Reverse a Number in Java
Java Program to convert Number to Word
Automorphic Number Program in Java
Peterson Number in Java
Sunny Number in Java
Tech Number in Java
Fascinating Number in Java
Keith Number in Java
Neon Number in Java
Spy Number in Java
ATM program Java
Autobiographical Number in Java
Emirp Number in Java
Sphenic Number in Java
Buzz Number Java
Duck Number Java
Evil Number Java
ISBN Number Java
Krishnamurthy Number Java
Bouncy Number in Java
Mystery Number in Java
Smith Number in Java
Strontio Number in Java
Xylem and Phloem Number in Java
nth Prime Number Java
Java Program to Display Alternate Prime Numbers
Java Program to Find Square Root of a Number Without sqrt Method
Java Program to Swap Two Numbers Using Bitwise Operator
Java Program to Find GCD of Two Numbers
Java Program to Find Largest of Three Numbers
Java Program to Find Smallest of Three Numbers Using Ternary Operator
Java Program to Check if a Number is Positive or Negative
Java Program to Check if a Given Number is Perfect Square
Java Program to Display Even Numbers From 1 to 100
Java Program to Display Odd Numbers From 1 to 100
Java Program to Find Sum of Natural Numbers
Java Program to copy all elements of one array into another array
Java Program to find the frequency of each element in the array
Java Program to left rotate the elements of an array
Java Program to print the duplicate elements of an array
Java Program to print the elements of an array
Java Program to print the elements of an array in reverse order
Java Program to print the elements of an array present on even position
Java Program to print the elements of an array present on odd position
Java Program to print the largest element in an array
Java Program to print the smallest element in an array
Java Program to print the number of elements present in an array
Java Program to print the sum of all the items of the array
Java Program to right rotate the elements of an array
Java Program to sort the elements of an array in ascending order
Java Program to sort the elements of an array in descending order
Java Program to Find 3rd Largest Number in an array
Java Program to Find 2nd Largest Number in an array
Java Program to Find Largest Number in an array
Java to Program Find 2nd Smallest Number in an array
Java Program to Find Smallest Number in an array
Java Program to Remove Duplicate Element in an array
Java Program to Print Odd and Even Numbers from an array
How to Sort an Array in Java
Java Matrix Programs
Java Program to Add Two Matrices
Java Program to Multiply Two Matrices
Java Program to subtract the two matrices
Java Program to determine whether two matrices are equal
Java Program to display the lower triangular matrix
Java Program to display the upper triangular matrix
Java Program to find the frequency of odd & even numbers in the given matrix
Java Program to find the product of two matrices
Java Program to find the sum of each row and each column of a matrix
Java Program to find the transpose of a given matrix
Java Program to determine whether a given matrix is an identity matrix
Java Program to determine whether a given matrix is a sparse matrix
Java Program to Transpose matrix
Java Program to count the total number of characters in a string
Java Program to count the total number of characters in a string 2
Java Program to count the total number of punctuation characters exists in a String
Java Program to count the total number of vowels and consonants in a string
Java Program to determine whether two strings are the anagram
Java Program to divide a string in 'N' equal parts.
Java Program to find all subsets of a string
Java Program to find the longest repeating sequence in a string
Java Program to find all the permutations of a string
Java Program to remove all the white spaces from a string
Java Program to replace lower-case characters with upper-case and vice-versa
Java Program to replace the spaces of a string with a specific character
Java Program to determine whether a given string is palindrome
Java Program to determine whether one string is a rotation of another
Java Program to find maximum and minimum occurring character in a string
Java Program to find Reverse of the string
Java program to find the duplicate characters in a string
Java program to find the duplicate words in a string
Java Program to find the frequency of characters
Java Program to find the largest and smallest word in a string
Java Program to find the most repeated word in a text file
Java Program to find the number of the words in the given text file
Java Program to separate the Individual Characters from a String
Java Program to swap two string variables without using third or temp variable.
Java Program to print smallest and biggest possible palindrome word in a given string
Reverse String in Java Word by Word
Reserve String without reverse() function
Linear Search in Java
Binary Search in Java
Bubble Sort in Java
Selection Sort in Java
Insertion Sort in Java
How to convert String to int in Java
How to convert int to String in Java
How to convert String to long in Java
How to convert long to String in Java
How to convert String to float in Java
How to convert float to String in Java
How to convert String to double in Java
How to convert double to String in Java
How to convert String to Date in Java
How to convert Date to String in Java
How to convert String to char in Java
How to convert char to String in Java
How to convert String to Object in Java
How to convert Object to String in Java
How to convert int to long in Java
How to convert long to int in Java
How to convert int to double in Java
How to convert double to int in Java
How to convert char to int in Java
How to convert int to char in Java
How to convert String to boolean in Java
How to convert boolean to String in Java
How to convert Date to Timestamp in Java
How to convert Timestamp to Date in Java
How to convert Binary to Decimal in Java
How to convert Decimal to Binary in Java
How to convert Hex to Decimal in Java
How to convert Decimal to Hex in Java
How to convert Octal to Decimal in Java
How to convert Decimal to Octal in Java
Java program to print the following spiral pattern on the console
Java program to print the following pattern
Java program to print the following pattern 2
Java program to print the following pattern 3
Java program to print the following pattern 4
Java program to print the following pattern 5
Java program to print the following pattern on the console
Java program to print the following pattern on the console 2
Java program to print the following pattern on the console 3
Java program to print the following pattern on the console 4
Java program to print the following pattern on the console 5
Java program to print the following pattern on the console 6
Java program to print the following pattern on the console 7
Java program to print the following pattern on the console 8
Java program to print the following pattern on the console 9
Java program to print the following pattern on the console 10
Java program to print the following pattern on the console 11
Java program to print the following pattern on the console 12
Singly linked list Examples in Java
Java Program to create and display a singly linked list
Java program to create a singly linked list of n nodes and count the number of nodes
Java program to create a singly linked list of n nodes and display it in reverse order
Java program to delete a node from the beginning of the singly linked list
Java program to delete a node from the middle of the singly linked list
Java program to delete a node from the end of the singly linked list
Java program to determine whether a singly linked list is the palindrome
Java program to find the maximum and minimum value node from a linked list
Java Program to insert a new node at the middle of the singly linked list
Java program to insert a new node at the beginning of the singly linked list
Java program to insert a new node at the end of the singly linked list
Java program to remove duplicate elements from a singly linked list
Java Program to search an element in a singly linked list
Java program to create and display a Circular Linked List
Java program to create a Circular Linked List of N nodes and count the number of nodes
Java program to create a Circular Linked List of n nodes and display it in reverse order
Java program to delete a node from the beginning of the Circular Linked List
Java program to delete a node from the end of the Circular Linked List
Java program to delete a node from the middle of the Circular Linked List
Java program to find the maximum and minimum value node from a circular linked list
Java program to insert a new node at the beginning of the Circular Linked List
Java program to insert a new node at the end of the Circular Linked List
Java program to insert a new node at the middle of the Circular Linked List
Java program to remove duplicate elements from a Circular Linked List
Java program to search an element in a Circular Linked List
Java program to sort the elements of the Circular Linked List
Java program to convert a given binary tree to doubly linked list
Java program to create a doubly linked list from a ternary tree
Java program to create a doubly linked list of n nodes and count the number of nodes
Java program to create a doubly linked list of n nodes and display it in reverse order
Java program to create and display a doubly linked list
Java program to delete a new node from the beginning of the doubly linked list
Java program to delete a new node from the end of the doubly linked list
Java program to delete a new node from the middle of the doubly linked list
Java program to find the maximum and minimum value node from a doubly linked list
Java program to insert a new node at the beginning of the Doubly Linked list
Java program to insert a new node at the end of the Doubly Linked List
Java program to insert a new node at the middle of the Doubly Linked List
Java program to remove duplicate elements from a Doubly Linked List
Java program to rotate doubly linked list by N nodes
Java program to search an element in a doubly linked list
Java program to sort the elements of the doubly linked list
Java Program to calculate the Difference between the Sum of the Odd Level and the Even Level Nodes of a Binary Tree
Java program to construct a Binary Search Tree and perform deletion and In-order traversal
Java program to convert Binary Tree to Binary Search Tree
Java program to determine whether all leaves are at same level
Java program to determine whether two trees are identical
Java program to find maximum width of a binary tree
Java program to find the largest element in a Binary Tree
Java program to find the maximum depth or height of a tree
Java program to find the nodes which are at the maximum distance in a Binary Tree
Java program to find the smallest element in a tree
Java program to find the sum of all the nodes of a binary tree
Java program to find the total number of possible Binary Search Trees with N keys
Java program to implement Binary Tree using the Linked List
Java program to search a node in a Binary Tree
Java Main Method
System.out.println()
Java Memory Management
Java ClassLoader
Java Decompiler
Java vs. JavaScript
Java vs. Kotlin
Java vs. Python
Java Absolute Value
How to Create File
Delete a File in Java
Open a File in Java
Sort a List in Java
Convert byte Array to String
Java Basics
How to Compile & Run Java Program
How to Run Java Program in Eclipse
How to Verify Java Version
Ways to Create an Object in Java
How to Run a Java program in Windows 10
Runnable Interface in Java
Java Keystore
Get input from user in Java
Read file line by line in Java
Take String input in Java
How to Read Excel File in Java
Read XML File in Java
CompletableFuture in Java
Java ExecutorService
How to iterate Map in Java
How to Return an Array in Java
How to Sort HashMap by Value
How to Sort HashMap in Java
Load Factor in HashMap
Array vs ArrayList
HashMap vs TreeMap
HashSet vs HashMap class
Compare Two ArrayList in Java
Merge Two Arrays in Java
Print Array in Java
Read CSV File in Java
Remove Special Characters from String
ArrayIndexOutOfBoundsException
ConcurrentModificationException
NoSuchElementException
NumberFormatException
How to Sort ArrayList in Java
How to Download Java
How to Call a Method in Java
How to Create Singleton Class in Java
How to Find Array Length in Java
How to Read Character in Java
Can We Overload main() Method in Java
How to Convert Char Array to String in Java
How to Run Java Program in CMD Using Notepad
How to Sort String Array in Java
How to Compare Dates in Java
How to Take Multiple String Input in Java Using Scanner
How to Remove Last Character from String in Java
How TreeMap Works Internally in Java
Java Program to Break Integer into Digits
Java Program to Calculate Area and Circumference of Circle
What is Diamond Problem in Java
Java Program to Read Number from Standard Input
How to Download Minecraft Java Edition
Can We Override Static Method in Java
How to Avoid Deadlock in Java
How to Achieve Abstraction in Java
How Garbage Collection Works in Java
How to Take Array Input in Java
How to Create Array of Objects in Java
How to Create Package in Java
How to Print in Java
What is Framework in Java
Why Java is Secure
How to Iterate List in Java
How to Use Eclipse for Java
Which Package is Imported by Default in Java
Could Not Find or Load Main Class in Java
How to Compare Two Arrays in Java
How to Convert String to JSON Object in Java
Which is Better Java or Python
How to Update Java
How to Get Value from JSON Object in Java Example
How to Split a String in Java with Delimiter
Structure of Java Program
Why We Use Constructor in Java
Java Create Excel File
Java Interpreter
javac is not Recognized
Dynamic Array in Java
Shunting yard algorithm
Java Destructor
Custom ArrayList in Java
ArrayList vs HashMap
Java Constant
Java Tokens
How to Enable Java in Chrome
Java Semaphore
Array to List in Java
JIT in Java
How to Clear Screen in Java
Java Logger
Reverse a String Using Recursion in Java
Java Path Vs File
Float Vs Double Java
Stack vs Heap Java
Abstraction vs Encapsulation
Top 10 Java Books
Public vs Private
What is Java Used For
Bitwise Operator in Java
SOLID Principles Java
Type Casting in Java
Conditional Operator in Java
Ternary Operator Java
Java Architecture
REPL in Java
Types of Exception in Java
Why String is Immutable or Final in Java
Java vs Kotlin
Set in Java
Why non-static variable cannot be referenced from a static context in Java
Java Developer Roles and Responsibilities
Types of Classes in Java
Marker Interface in Java
Static Function in Java
Unary Operators in Java
What is Advance Java
ArrayList Implementation
Convert ArrayList to String Array
Hashmap vs ConcurrentHashMap
List vs ArrayList
Map vs HashMap
HashSet vs LinkedHashSet
How TreeSet Works Internally
LinkedHashMap vs HashMap
Java Program to Solve Quadratic Equation
Scope Resolution Operator in Java
Composition in Java
File Operations in Java
NoClassDefFoundError in Java
Thread Concept in Java
Upcasting and Downcasting in Java
Dynamic Polymorphism in Java
String Pool in Java
What is constructor chaining in Java
Add elements to Array in Java
Advantages and disadvantages of Java
Advantages of JavaBeans
AWS SDK for Java with Apache Maven
AWT and Swing in Java
AWT Program in Java
Boolean values in Java
ByteStream Classes in Java
CharacterStream Classes in Java
Class and Interface in Java
ClassCast Exception in Java
Cloneable in Java
Constructor overloading in Java
Control Flow in Java
Convert Java Object to Json using GSON
Convert XML to JSON in Java
How to avoid null pointer exception in Java
Java constructor returns a value, but what
Singleton Class in Java
Doubly Linked List Program in Java
Association in Java
Big data Java vs Python
Branching Statements in Java
Collections Sort in Java 8
List vs Set in Java
How many days required to learn Java
Implicitly Typecasting in Java
Legacy Class in Java
Character Array in Java
Equals() and Hashcode() in Java
Externalization in Java
Identifiers in Java
InvocationTargetException
Java Pass by Value
Mutable and Immutable in Java
Power Function in Java
Primitive Data Types in Java
String Array in Java
Virtual Function in Java
C vs C++ vs Java
Java String Max Size
Convert Java object to JSON
How to Calculate Date Difference in Java
How to Improve Coding Skills in Java
Java Email Validation
Java Testing Tools
Permutation and Combination in Java
Unique Number in Java Program
Java Code for DES
Pig Latin Program in Java
Array Rotation in Java
Equilibrium Index of an Array in Java
Different Ways to Print Exception Message in Java
Java Copy Constructor Example
Why We Use Static Class in Java
What is Core Java
Set vs Map in Java
How to Create a New Folder in Java
Remove an Element from ArrayList in Java
How to Create Test Cases for Exceptions in Java
How to Convert JSON Array to ArrayList in Java
How to Create a Class File in Java
Java Spring Pros & Cons
Java Stack Trace
Array Slicing in Java
Flutter vs Java
Permutation of Numbers in Java
Magic Number in Java
Reference Data Types in Java
Counter variable in Java
How to take Character Input in Java using BufferedReader Class
Java employee details program
Java is case sensitive explain
Ramanujan Number or Taxicab Number in Java
Advanced Java Books in 2021
Fail Fast and Fail Safe Iterator in Java
How to build a Web Application Using Java
Is Java Interpreted or Compiled
Java Big Data Frameworks
Java Get Data From URL
No Main Manifest Attribute
Java missing return statement
Java program to remove duplicate characters from a string
JUnit test case example in Java
List of logical programs in Java
PermGen space Java
Unsigned Right Shift Operator in Java
Infix to Postfix Java
Memory Leak in Java
How To Write Test Cases In Java
Java 32-Bit Download For Windows 10
FizzBuzz Program in Java
A Java Runtime Environment JRE Or JDK Must Be Available
Java Does Not Open
No Java Virtual Machine was Found
Java Program Number to Word
Types of Garbage Collector in Java
No Suitable Driver Found For JDBC
AVL Tree program in Java
Fail-fast and Fail-safe in Java
Find unique elements in array Java
Highest precedence in Java
Java Closure
Java String Encoding
Prim's algorithm Java
Quartz scheduler java
Red Black Tree Java
GC Overhead Limit Exceeded
Generating QR Code in Java
Delegation Event Model in Java
Java Profilers
Java Flight Recorder
Bucket Sort in Java
Java Atomic
Wait vs Sleep in Java
Executor Framework Java
Gregorian calendar Java
int vs Integer Java
What is truncation in Java
Java HTTP Proxy Server
Java Static Constructor
How to prepare for Java Interview
Java callback function
Java 8 vs Java 11
Login Form Java
Vaadin Framework Java
EJB vs. Spring
Types of Applets in Java
Visitor Design Pattern Java
Advantages of Python over Java
Design Principles in Java
JSON Validator Java
Pseudocode Java
Windows Programming Using Java
Vert.x Java
Complex Java Programs
ORE Number Java
PalPrime Number Java
Twin Prime Numbers
Twisted Prime Number Java
Ugly number Java
Achilles Number in Java
Amicable Pair Number in Java
Playfair Cipher Program in Java
Java.lang.outofmemoryerror: java heap space
Banker's Algorithm Java
Kruskal Algorithm Java
Longest Common Subsequence
Travelling Salesman Problem
& vs && in Java
Jumping Number in Java
Lead Number in Java
Lucky Number in Java
Middle Digit Number in Java
Special Number in Java
Passing Array to Function In Java
Lexicographical Order Java
Adam Number in Java
Bell Number in Java
Reduce Java
LRU Cache Implementation
Goldbach Number in Java
How to Find Number of Objects Created in Java
Multiply Two Numbers Without Using Arithmetic Operator in Java
Sum of Digits of a Number in Java
Sum of Numbers in Java
Power of a Number in Java
Sum of Prime Numbers in Java
Cullen Number in Java
Mobile Number Validation in Java
Fermat Number in Java
Instantiation in Java
Exception Vs Error in Java
flatMap() Method in Java 8
How to Print Table in Java
Java Create PDF
Mersenne Number in Java
Pandigital Number in Java
Pell Number in Java
Java Get Post
Fork Join in Java
Java Callable Example
Blockchain Java
Design of JDBC
Java Anon Proxy
Knapsack Problem Java
Session Tracking in Java
What is Object-Oriented Programming
Literals in Java
Square Free Number in Java
What is an anagram in Java
What is programming
Iterate JSON Array Java
Java Date Add Days
Javac Command Not Found
Factorial Program in Java Using while Loop
Frugal Number in Java
Java Digital Signature
Catalan Number in Java
Partition Number in Java
Powerful Number in Java
Practical Number in Java
Chromatic Number in Java
Sublime Number in Java
Advanced Java Viva Questions
Getter and Setter Method in Java Example
How to convert String to String array in Java
How to Encrypt Password in Java
Instance Variable in Java
Java File Extension
Types of Inheritance in Java
Untouchable Number in Java
AES 256 Encryption in Java
Applications of Array in Java
Example of Static Import in Java
Hill Cipher Program in Java
Lazy Loading in Java
Rectangular Number in Java
How to Print Table in Java Using Formatter
IdentityHashMap Class in Java
Undulating Number in Java
Java Obfuscator
Java Switch String
Applet Life Cycle in Java
Banking Application in Java
Duodecimal in Java
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Figurate Number in Java
How to resolve IllegalStateException in Java
Java Coding Software
Java Create Jar Files
Java Framework List
Java Initialize array
java lang exception no runnable methods
Nonagonal Number in Java
SexagesimalFormatter in Java
Sierpinski Number in Java
Vigesimal in Java
Java Color Codes
JDoodle Java
Online Java Compiler
Pyramidal Number in Java
Relatively Prime in Java
Java Modulo
Repdigit Numbers in Java
Abstract Method in Java
Convert Text-to-Speech in Java
Java Editors
MVC Architecture in Java
Narcissistic Number in Java
Hashing Algorithm in Java
Java Escape Characters
Java Operator Precedence
Private Constructor in Java
Scope of Variables in Java
Groovy vs Java
Java File Upload to a Folder
Java Full Stack
Java Developer
Thread States in Java
Java EE vs Node.js
Loose Coupling in Java
Java Top 10 Libraries
Method Hiding in Java
Dijkstra Algorithm Java
Extravagant Number in Java
Java Unicode
New Line in Java
Return Statement in Java
Order of Execution of Constructors in Java Inheritance
Cardinal Number in Java
Hyperfactorial in Java
Identifier Expected Error in Java
Java Generate UUID
Labeled Loop in Java
Lombok Java
Ordinal Number in Java
Tetrahedral Number in Java
Cosmic Superclass in Java
Shallow Copy Java
BiFunction Java 8
Equidigital Number in Java
Fall Through in Java
Java Reserved Keywords
Parking Lot Design Java
Boyer Moore Java
Java Security Framework
Tetranacci Number in Java
BFS Algorithm in Java
CountDownLatch in Java
Counting sort in Java
CRC Program in Java
FileNotFoundException in Java
InputMismatchException in Java
Java ASCII Table
Lock in Java
Segment Tree in Java
Why main() method is always static in Java
Bellman-Ford Algorithm Java
BigDecimal toString() in Java
.NET vs Java
Java ZipFile
Lazy Propagation in Segment Tree in Java
Magnanimous Number in Java
Binary Tree Java
How to Create Zip File in Java
Java Dot Operator
Associativity of Operators in Java
Fenwick Tree in Java
How annotation works in Java
How to Find Length of Integer in Java
Java 8 filters
List All Files in a Directory in Java
How to Get Day Name from Date in Java
Zigzag Array in Java
Class Definition in Java
Find Saddle Point of a Matrix in Java
Non-primitive data types in Java
Pancake Number in Java
Pancake Sorting in Java
Print Matrix Diagonally in Java
Sort Dates in Java
Carmichael Numbers in Java
Contextual Keywords in Java
How to Open Java Control Panel
How to Reverse Linked List in Java
Interchange Diagonal Elements Java Program
Java Set to List
Level Order Traversal of a Binary Tree in Java
Bully algorithm in Java
Convert JSON File to String in Java
Convert Milliseconds to Date in Java
Copy Content/ Data From One File to Another in Java
Constructor vs Method in Java
Access Specifiers vs Modifiers
Java vs PHP
replace() vs replaceAll() in Java
this vs super in Java
Heap implementation in Java
How to Check null in Java
Java Arrays Fill
Rotate Matrix by 90 Degrees in Java
Exception Class in Java
Transient variable in Java
Web crawler Java
Zigzag Traversal of a Binary Tree in Java
Java Get File Size
Internal Working of ArrayList in Java
Java Program to Print Matrix in Z Form
Vertical Order Traversal of a Binary Tree in Java
Group By in Java 8
Hashing Techniques in Java
Implement Queue Using Array in Java
Java 13 Features
Package Program in Java
Canonical Name Java
Method Chaining in Java
Orphaned Case Java
Bottom View of a Binary Tree in Java
Coercion in Java
Dictionary Class in Java
Left View of a Binary Tree in Java
Pangram Program in Java
Top View of a Binary Tree in Java
Tribonacci Series in Java
Hollow Diamond Pattern in Java
Normal and Trace of a Matrix in Java
Right View of a Binary Tree in Java
Dining Philosophers Problem and Solution in Java
Shallow Copy vs Deep Copy in Java
Java Password Generator
Java Program for Shopping Bill
Lock Interface in Java
Convert JSON to Map in Java
Convert JSON to XML in Java
Middle Node of a Linked List in Java
Pernicious Number in Java
Cohesion in Java
How to get UTC time in Java
Jacobsthal Number in Java
Java Calculate Age
Tribonacci Number Java
Bernoulli number in Java
Cake Number in Java
Compare time in Java
Compare Two Sets in Java
Crown Pattern in Java
Convert List to Array in Java
Aggregation vs Composition
Morris Traversal for Inorder in Java
Morris Traversal for Preorder in Java
Package Naming Conversion in Java
India Map Pattern in Java
Ladder Pattern in Java
ORM Tools in Java
Odious Number in Java
Rat in a Maze Problem in Java
Sudoku in Java
Christmas Tree Pattern in Java
Double Hashing in Java
Magic Square in Java
Possible Paths from Top Left to Bottom Right of a Matrix in Java
Palindrome Partitioning Problem in Java
Rehashing in Java
Round Robin Scheduling Program in Java
Types of Statements in Java
Compound Assignment Operator in Java
Prime Points in Java
Butterfly Pattern in Java
Fish Pattern in Java
Flag Pattern in Java
Kite pattern in Java
Swastika Pattern in Java
Tug of War in Java
Clone HashMap in Java
Fibodiv Number in Java
Heart Pattern in Java
How to check data type in Java
Java Array Clone
Use of final Keyword in Java
Factorial of a Large Number in Java
Race Condition in Java
Static Array in Java
Water Jug Problem in Java
Electricity Bill Program in Java
Facts about null in Java
Maximizing Profit in Stock Buy Sell in Java
Permutation Coefficient in Java
Convert List to String in Java
List of Constants in Java
MOOD Factors to Assess a Java Program
Computing Digit Sum of All Numbers From 1 to n in Java
Read PDF File in Java
Finding Odd Occurrence of a Number in Java
Java Indentation
Zig Zag Star and Number Pattern in Java
Check Whether a Number is a Power of 4 or not in Java
Kth Smallest in an Unsorted Array in Java
BlockingQueue in Java
Next Greater Element in Java
Star Numbers in Java
3N+1 Problem in Java
Java Program to Find Local Minima in An Array
Processing Speech in Java
Java Output Formatting
House Numbers in Java
Java Program to Generate Binary Numbers
Longest Odd-Even Subsequence in Java
Java Subtract Days from Current Date
Java Future Example
Minimum Cost Path Problem in Java
Diffie-Hellman Algorithm in Java
Ganesha's Pattern in Java
Hamming Code in Java
Map of Map in Java
Print Pencil Shape Pattern in Java
Zebra Puzzle in Java
Display Unique Rows in a Binary Matrix in Java
Rotate A Matrix By 180 Degree in Java
Dangling Else Problem in Java
Java Application vs Java Applet
Dutch National Flag Problem in Java
Java Calculate Average of List
compareToIgnoreCase Java
Trimorphic Numbers in Java
Arithmetic Exception in Java
Java instanceof operator
Java Localization
Minimum XOR Value Pair in Java
Iccanobif Numbers in Java
Java Program to Count the Occurrences of Each Character
Java Technologies List
Java Program to Find the Minimum Number of Platforms Required for a Railway Station
Shift Operators in Java
Final Object in Java
Object Definition in Java
Shadowing in Java
Zipping and Unzipping Files in Java
Display the Odd Levels Nodes of a Binary Tree in Java
Java Variable Declaration
Nude Numbers in Java
Java Programming Challenges
Java URL Encoder
anyMatch() in Java 8
Sealed Class in Java
Camel case in Java
Career Options for Java Developers to Aim in 2022
Java Progress Bar
Maximum Rectangular Area in a Histogram in Java
Polygonal Number in Java
Two Sorted LinkedList Intersection in Java
Set Matrix Zeros in Java
Find Number of Island in Java
Balanced Prime Number in Java
Minecraft Bedrock vs Java Minecraft
arr.length vs arr[0].length vs arr[1].length in Java
Future in Java 8
How to Set Timer in Java
Construct the Largest Number from the Given Array in Java
Minimum Coins for Making a Given Value in Java
Eclipse Shortcuts Java
Empty Statement in Java
Java Program to Implement Two Stacks in an Array
Java Snippet
Longest Arithmetic Progression Sequence in Java
Types of Sockets in Java
Java Program to Add Digits Until the Number Becomes a Single Digit Number
Next Greater Number with Same Set of Digits in Java
Split the Number String into Primes in Java
Java Cron Expression
Huffman Coding Java
Java Snippet Class
Why Java is So Popular
Java Project idea
Java Web Development
Brilliant Numbers in Java
Sort Elements by Frequency in Java
Beautiful Array in Java
Moran Numbers in Java
Intersection Point of Two Linked List in Java
Sparse Number in Java
How to Check JRE Version
Java Programming Certification
Two Decimal Places Java
Eclipse Change Theme
Java how to Convert Bytes to Hex
Decagonal Numbers in Java
Java Binary to Hexadecimal Conversion
Java Hexadecimal to Binary Conversion
How to Capitalize the First Letter of a String in Java
Java &0XFF Example
Stream findFirst() Method in Java
Balanced Parentheses in Java
Caesar Cipher Program in Java
next() vs nextLine()
Java Split String by Comma
Spliterator in java 8
Tree Model Nodes in Jackson
Types of events in Java
Callable and Future in Java
How to Check Current JDK Version installed in Your System Using CMD
How to Round Double and Float up to Two Decimal Places in Java
Java 8 Multimap
Parallel Stream in Java
Java Convert Bytes to Unsigned Bytes
Display List of TimeZone with GMT and UTC in Java
Binary Strings Without Consecutive Ones in Java
Convert IP to Binary in Java
Returning Multiple Values in Java
Centered Square Numbers in Java
ProcessBuilder in Java
How to Clear Java Cache
IntSummaryStatistics Class in Java
Java ProcessBuilder Example
Java Program to Delete a Directory
Java Program to Print Even Odd Using Two Threads
Java Variant
MessageDigest in Java
Alphabet Pattern in Java
Java Linter
Java Mod Example
Stone Game in Java
TypeErasure in Java
How to Remove substring from String in Java
Program to print a string in vertical in Java
How to Split a String between Numbers and Letters
String Handling in Java
Isomorphic String in Java
Java ImageIO Class
Minimum Difference Subarrays in Java
Plus One to Array Problem in Java
Unequal Adjacent Elements in Java
Java Parallel Stream Example
SHA Hashing in Java
How to make Java projects
Java Fibers
Java MD5 Hashing Example
Hogben Numbers in Java
Self-Descriptive Numbers in Java
Hybrid Inheritance in Java
Java IP Address (IPv4) Regex Examples
Converting Long to Date in JAVA
Java 17 new features
GCD of Different SubSequences in Java
Sylvester Sequence in Java
Console in Java
Asynchronous Call in Java
Minimum Window Substring in Java
Nth Term of Geometric Progression in Java
Coding Guidelines in Java
Couple Holding Hands Problem in Java
Count Ones in a Sorted binary array in Java
Ordered Pair in Java
Tetris Game in Java
Factorial Trailing Zeroes in Java
Java Assert Examples
Minimum Insertion To Form A Palindrome in Java
Wiggle Sort in Java
Java Exit Code 13
Java JFileChooser
What is LINQ
NZEC in Java
Box Stacking Problem
K Most Frequent Elements in Java
Parallel Programming in Java
How to Generate JVM Heap Memory Dump
Java Program to use Finally Block for Catching Exceptions
Count Login Attempts Java
Largest Independent Set in Java
Longest Subarray With All Even or Odd Elements in Java
Open and Closed Hashing in Java
DAO Class in Java
Kynea Numbers in Java
UTF in Java
Zygodromes in Java
ElasticSearch Java API
Form Feed in Java
Java Clone Examples
Payment Gateway Integration in Java
What is PMD
RegionMatches() Method in Java
Repaint() Method in Java
Serial Communication in Java
Count Double Increasing Series in A Range in Java
Longest Consecutive Subsequence in Java
Smallest Subarray With K Distinct Numbers in Java
String Sort Custom in Java
Count Number of Distinct Substrings in a String in Java
Display All Subsets of An Integer Array in Java
Digit Count in a Factorial Of a Number in Java
Valid Parentheses Problem in Java
Median Of Stream Of Running Integers in Java
Arrow Operator in Java
Java Learning app
Create Preorder Using Postorder and Leaf Nodes Array
Display Leaf nodes from Preorder of a BST in Java
Unicodes for Operators in Java
XOR and XNOR operators in Java
AWS Lambda in Java
AWS Polly in Java
SAML in Java
SonarQube in Java
UniRest in Java
Override equals method in Java
Undo and Redo Operations in Java
Size of longest Divisible Subset in an Array in Java
Sort An Array According To The Set Bits Count in Java
Two constructors in one class in Java
Union in Java
What is New in Java 15
ART in Java
Definite Assignment in Java
Cast Operator in Java
Diamond operator in Java
Java Singleton Enum
Three-way operator | Ternary operator in Java
GoF Design Pattern Java
Shorthand Operator in Java
What is new in Java 17
How to Find the Java Version in Linux
What is New in Java 12
Exception in Thread Main java.util.NoSuchElementException no line Found
How to reverse a string using recursion in Java
Java Program to Reverse a String Using Stack
Java Program to Reverse a String Using the Stack Data Structure
Reverse Middle Words of a String in Java
Sastry Numbers in Java
Sum of LCM in Java
Tilde Operator in Java
8 Puzzle problems in Java
Maximum Sum Such That No Two Elements Are Adjacent in Java
Reverse a String in Place in Java
Reverse a string Using a Byte array in Java
Reverse a String Using Java Collections
Reverse String with Special Characters in Java
get timestamp in java
How to convert file to hex in java
AbstractSet in java
List vs Set vs Map in Java
Birthday Problem in Java
How to Calculate the Time Difference Between Two Dates in Java
Number of Mismatching Bits in Java
Palindrome Permutation of a String in Java
Grepcode java.util.Date
How to add 24 hrs to date in Java
How to Change the Day in The Date Using Java
Java ByteBuffer Size
java.lang.NoSuchMethodError
Maximum XOR Value in Java
How to Add Hours to The Date Object in Java
How to Increment and Decrement Date Using Java
Multithreading Scenarios in Java
Switch case with enum in Java
Longest Harmonious Subsequence in Java
Count OR Pairs in Java
Merge Two Sorted Arrays Without Extra Space in Java
How to call a concrete method of abstract class in Java
How to create an instance of abstract class in Java
Java Console Error
503 error handling retry code snippets Java
Implementation Of Abstraction In Java
How to avoid thread deadlock in Java
Number of Squareful Arrays in Java
One-Time Password Generator Code In Java
Real-Time Face Recognition In Java
Converting Integer Data Type to Byte Data Type Using Typecasting in Java
How to Generate File checksum Value
Index Mapping (or Trivial Hashing) With Negatives allowed in Java
Shortest Path in a Binary Maze in Java
customized exception in Java
Difference between error and exception in Java
How to solve deprecated error in Java
Jagged Array in Java
CloneNotSupportedException in Java with Examples
Difference Between Function and Method in Java
Immutable List in Java
Nesting Of Methods in Java
How to Convert Date into Character Month and Year Java
How to Mock Lambda Expression in Java
How to Return Value from Lambda Expression Java
if Condition in Lambda Expression Java
Chained Exceptions in Java
Final static variable in Java
Java File Watcher
Various Operations on HashSet in Java
Word Ladder Problem in Java
Various Operations on Queue in Java
Various Operations on Queue Using Linked List in Java
Various Operations on Queue Using Stack in Java
Get Yesterday's Date from Localdate Java
Get Yesterday's Date by No of Days in Java
Advantages of Lambda Expression in Java 8
Cast Generic Type to Specific type Java
ConcurrentSkipListSet in Java
Fail Fast Vs. Fail-Safe in Java
Get Yesterday's Date in Milliseconds Java
Get Yesterday's Date Using Date Class Java
Getting First Date of Month in Java
Gregorian Calendar Java Current Date
How to Calculate Time Difference Between Two Dates in Java
How to Calculate Week Number from Current Date in Java
Keystore vs Truststore
Leap Year Program in Java
Online Java Compiler GDB
Operators in Java MCQ
Separators In Java
StringIndexOutOfBoundsException in Java
Anonymous Function in Java
Default Parameter in Java
Group by Date Code in Java
How to add 6 months to Current Date in Java
How to Reverse A String in Java Letter by Letter
Java 8 Object Null Check
Java Synchronized
Types of Arithmetic Operators in Java
Types of JDBC Drivers in Java
Unmarshalling in Java
Write a Program to Print Reverse of a Vowels String in Java
ClassNotFound Exception in Java
Null Pointer Exception in Java
Why Does BufferedReader Throw IOException in Java
Java Program to Add two Complex Numbers
Read and Print All Files From a Zip File in Java
Reverse an Array in Java
Right Shift Zero Fill Operator in Java
Static Block in Java
Accessor and Mutator in Java
Array of Class Objects in Java
Benefits of Generics in Java
Can Abstract Classes Have Static Methods in Java
ClassNotFoundException Java
Creating a Custom Generic Class in Java
Generic Queue Java
Getting Total Hours From 2 Dates in Java
How to add 2 dates in Java
How to Break a Date and Time in Java
How to Call Generic Method in Java
How to Increment and Decrement Date using Java
Java Class Methods List
Java Full Stack Developer
Java.lang.NullPointerException
Least Operator to Express Number in Java
Shunting Yard Algorithm in Java
Switch Case Java
Treeset Java Operations
Types of Logical Operators in Java
What is Cast Operator in Java
What is Jersey in Java
Alternative to Java Serialization
API Development in Java
Disadvantage of Multithreading in Java
Find the row with the maximum number of 1s
Generic Comparator in Java
Generic LinkedList in Java
Generic Programming in Java Example
How Can I Give the Default Date in The Array Java
How to Accept Date in Java
How to add 4 years to Date in Java
How to Check Date Equality in Java
How to Modify HTML File Using Java
Java 8 Multithreading Features
Java Abstract Class and Methods
Java Thread Dump Analyser
Process vs. Thread in Java
Reverse String Using Array in Java
Types of Assignment Operators in Java
Types of Bitwise Operators in Java
Union and Intersection Of Two Sorted Arrays In Java
Vector Operations Java
Java Books Multithreading
Advantages of Generics in Java
Arrow Operator Java
Generic Code in Java
Generic Method in Java Example
Getting a Range of Dates in Java
Getting the Day from a Date in Java
How Counter Work with Date Using Java
How to Add Date in Arraylist Java
How to Create a Generic List in Java
Java Extend Multiple Classes
Java Function
Java Generics Design Patterns
Why Are Generics Used in Java
XOR Binary Operator in Java
Check if the given string contains all the digits in Java
Constructor in Abstract Class in Java
Count number of a class objects created in Java
Difference Between Byte Code and Machine Code in Java
Java Program to Append a String in an Existing File
Main thread in Java
Store Two Numbers in One Byte Using Bit Manipulation in Java
The Knight's Tour Problem in Java
Business Board Problem in Java
Business Consumer Problem in Java
Buy as Much Candles as Possible Java Problem
Get Year from Date in Java
How to Assign Static Value to Date in Java
Java List Node
Java List Sort Lambda
Java Program to Get the Size of a Directory
Misc Operators in Java
Reverse A String and Reverse Every Alternative String in Java
Reverse a String in Java Using StringBuilder
Reverse Alternate Words in A String Java
Size of Empty Class in Java
Titniry Operation in Java
Triple Shift Operator in Java
Types of Conditional Operators in Java
View Operation in Java
What is Linked list Operation in Java
What is Short Circuit && And or Operator in Java
What is the & Operator in Java
Why to use enum in Java
XOR Bitwise Operator in Java
XOR Logical Operator Java
Compile-Time Polymorphism in Java
Convert JSON to Java Object Online
Difference between comparing String using == and .equals() method in Java
Difference Between Singleton Pattern and Static Class in Java
Difference Between Static and Non-Static Nested Class in Java
Getting Date from Calendar in Java
How to Swap or Exchange Objects in Java
Java Get Class of Generic Parameter
Java Interface Generic Parameter
Java Map Generic
Java Program for Maximum Product Subarray
Java Program To Print Even Length Words in a String
Logger Class in Java
Manacher's Algorithm in Java
Mutable Class in Java
Online Java IDE
Package getImplementationVersion() method in Java with Examples
Set Default Close Operation in Java
Sorting a Java Vector in Descending Order Using Comparator
Types of Interfaces in Java
Understanding String Comparison Operator in Java
User-Defined Packages in Java
Valid variants of main() in Java
What is a Reference Variable in Java
What is an Instance in Java
What is Retrieval Operation in ArrayList Java
When to Use the Static Method in Java
XOR Operations in Java
7th Sep - Array Declaration in Java
7th Sep - Bad Operand Types Error in Java
7th Sep - Data Structures in Java
7th Sep - Generic Type Casting In Java
7th Sep - Multiple Inheritance in Java
7th Sep - Nested Initialization for Singleton Class in Java
7th Sep - Object in Java
7th Sep - Recursive Constructor Invocation in Java
7th Sep - Java Language / What is Java
7th Sep - Why is Java Platform Independent
7th Sep - Card Flipping Game in Java
7th Sep - Create Generic Method in Java
7th Sep - Difference between super and super() in Java with Examples
7th Sep - for loop enum Java
7th Sep - How to Convert a String to Enum in Java
7th Sep - Illustrate Class Loading and Static Blocks in Java Inheritance
7th Sep - Introduction To Java
7th Sep - Java Lambda foreach
7th Sep - Java Latest Version
7th Sep - Java Method Signature
7th Sep - Java Practice Programs
7th Sep - Java SwingWorker Class
7th Sep - java.util.concurrent.RecursiveAction class in Java With Examples
7th Sep - Largest Palindrome by Changing at Most K-digits in Java
7th Sep - Parameter Passing Techniques in Java with Examples
7th Sep - Reverse a String in Java Using a While Loop
7th Sep - Reverse a String Using a For Loop in Java
7th Sep - Short Circuit Operator in Java
7th Sep - Java 8 Stream API
7th Sep - XOR Operation on Integers in Java
7th Sep - XOR Operation on Long in Java
Array Programs in Java
Concrete Class in Java
Difference between Character Stream and Byte Stream in Java
Difference Between Static and non-static in Java
Different Ways to Convert java.util.Date to java.time.LocalDate in Java
Find the Good Matrix Problem in Java
How Streams Work in Java
How to Accept Different Formats of Date in Java
How to Add Date in MySQL from Java
How to Find the Size of int in Java
How to Make a Field Serializable in Java
How to Pass an Array to Function in Java
How to Pass an ArrayList to a Method in Java
Implementing the Java Queue Interface
Initialization of local variable in a conditional block in Java
isnull() Method in Java
Java Array Generic
Java Program to Demonstrate the Lazy Initialization Non-Thread-Safe
Java Program to Demonstrate the Non-Lazy Initialization Thread-Safe
Java Static Field Initialization
Machine Learning Using Java
Mars Rover Problem in Java
Model Class in Java
Nested Exception Handling in Java
Program to Convert List to Stream in Java
Static Polymorphism in Java
Static Reference Variables in Java
Sum of Two Arrays in Java
What is Is-A-Relationship in Java
When to Use Vector in Java
Which Class cannot be subclassed in Java
Word Search Problem in Java
XOR Operation Between Sets in Java
Burger Problem in Java Game
Convert Set to List in Java
Floyd Triangle in Java
How to Call Static Blocks in Java
Interface Attributes in Java
Java Applications in the Real World
Java Concurrent Array
Java Detect Date Format
Java Interface Without Methods
Java Iterator Performance
Java Packet
Java Static Instance of Class
Java TreeMap Sort by Value
Length of List in Java
List of Checked Exceptions in Java
Message Passing in Java
Product Maximization Problem in Java
Terminal Operations in Java 8
Understanding Base Class in Java
Difference between Early Binding and Late Binding in Java
Collectors toCollection() in Java
Difference between ExecutorService execute() and submit() method in Java
Difference between Java and Core Java
Different Types of Recursions in Java
Initialize a static map in Java with Examples
Merge Sort Using Multithreading in Java
Why Thread.stop(), Thread.suspend(), and Thread.resume() Methods are Deprecated After JDK 1.1 Version
Circular Primes in Java
Difference Between poll() and remove() Method of a Queue
EvalEx Java: Expression Evaluation in Java
Exeter Caption Contest Java Program
FileInputStream finalize() Method in Java
Find the Losers of the Circular Game problem in Java
Finding the Differences Between Two Lists in Java
Finding the Maximum Points on a Line in Java
Get Local IP Address in Java
Handling "Handler dispatch failed" Nested Exception: java.lang.StackOverflowError in Java
Harmonic Number in Java
How to Find the Percentage of Uppercase Letters, Lowercase Letters, Digits, and Special Characters in a String Using Java
Interface Variables in Java
Java 8 Interface Features
Java Class Notation
Java Exception Messages Examples and Explanations
Java Package Annotation
Java Program to Find First Non-Repeating Character in String
Java Static Type Vs. Dynamic Type
Kaprekar Number in Java
Multitasking in Java
Niven Number in Java
Rhombus Pattern in Java
Shuffle an Array in Java
Static Object in Java
The Scope of Variables in Java
Toggle String in Java
Use of Singleton Class in Java
What is the Difference Between Future and Callable Interfaces in Java
Aggregate Operation in Java 8
Bounded Types in Java
Calculating Batting Average in Java
Compare Two LinkedList in Java
Comparison of Autoboxed Integer objects in Java
Count Tokens in Java
Cyclomatic Complexity in Java
Deprecated Meaning in Java
Double Brace Initialization in Java
Functional Interface in Java
How to prevent objects of a class from Garbage Collection in Java
Java Cast Object to Class
Java isAlive() Method
Java Line Feed Character
java.net.MulticastSocket class in Java
Keytool Error java.io.FileNotFoundException
Matrix Diagonal Sum in Java
Number of Boomerangs Problem in Java
Sieve of Eratosthenes Algorithm in Java
Similarities Between Bastar and Java
Spring vs. Struts in Java
Switch Case in Java 12
The Pig Game in Java
Unreachable Code Error in Java
Who Were the Kalangs of Java
2048 Game in Java
Abundant Number in Java
Advantages of Applet in Java
Alpha-Beta Pruning Java
ArgoUML Reverse Engineering Java
Can Constructor be Static in Java
Can we create object of interface in Java
Chatbot Application in Java
Difference Between Component and Container in Java
Difference Between Java.sql and Javax.sql
Find A Pair with Maximum Product in Array of Integers
Goal Stack Planning Program in Java
Half Diamond Pattern in Java
How to find trigonometric values of an angle in Java
How to Override tostring() method in Java
Inserting a Node in a Doubly Linked List in Java
Java 9 Immutable Collections
Java 9 Interface Private Methods
Java Convert Array to Collection
Java Transaction API
Methods to Take Input in Java
Parallelogram Pattern in Java
Reminder Program in Java
Sliding Window Protocol in Java
Static Method in Java
String Reverse in Java 8 Using Lambdas
Types of Threads in Java
What is thread safety in Java? How do you achieve it?
xxwxx.dll Virus Java 9
Java 8 Merge Two Maps with Same Keys
Java 8 StringJoiner, String.join(), and Collectors.joining()
Java 9 @SafeVarargs Annotation Changes
Java 9 Stream API Improvements
Java 11 var in Lambda Expressions
Sequential Search Java
Thread Group in Java
User Thread Vs. Daemon Thread in Java
Collections Vs. Streams in Java
Import statement in Java
init() Method in Java
Java Generics Jenkov
Ambiguity in Java
Benefits of Learning Java
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Java is a popular programming language that software developers use to construct a wide range of applications. It is a simple, robust, and platform-independent object-oriented language. There are various types of assignment operators in Java, each with its own function.

In this section, we will look at Java's many types of assignment operators, how they function, and how they are utilized.

To assign a value to a variable, use the basic assignment operator (=). It is the most fundamental assignment operator in Java. It assigns the value on the right side of the operator to the variable on the left side.

In the above example, the variable x is assigned the value 10.

To add a value to a variable and subsequently assign the new value to the same variable, use the addition assignment operator (+=). It takes the value on the right side of the operator, adds it to the variable's existing value on the left side, and then assigns the new value to the variable.

To subtract one numeric number from another, use the subtraction operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we create two integer variables, a and b, subtract b from a, and then assign the result to the variable c.

To combine two numerical numbers, use the multiplication operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we declare two integer variables, a and b, multiply their values using the multiplication operator, and then assign the outcome to the third variable, c.

To divide one numerical number by another, use the division operator. All numeric data types, including integers and floating-point values, can be utilised with it. Here's an illustration:

In this example, we declare two integer variables, a and b, divide them by one another using the division operator, and then assign the outcome to the variable c.

It's vital to remember that when two numbers are divided, the outcome will also be an integer, and any residual will be thrown away. For instance:

The modulus assignment operator (%=) computes the remainder of a variable divided by a value and then assigns the resulting value to the same variable. It takes the value on the right side of the operator, divides it by the current value of the variable on the left side, and then assigns the new value to the variable on the left side.

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Introduction to programming in java, lecture 4: classes and objects.

Lecture presentation on programming in Java. Topics include: object oriented programming, defining classes, using classes, constructors, methods, accessing fields, primitives versus references, references versus values, and static types and methods.

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Java Assignment Operators

Description.

Assigning a value to a variable seems straightforward enough; you simply assign the stuff on the right side of the '= 'to the variable on the left. Below statement 1 assigning value 10 to variable x and statement 2 is creating String object called name and assigning value "Amit" to it.

Assignment can be of various types. Let’s discuss each in detail.

Primitive Assignment:

The equal (=) sign is used for assigning a value to a variable. We can assign a primitive variable using a literal or the result of an expression.

Primitive Casting

Casting lets you convert primitive values from one type to another. We need to provide casting when we are trying to assign higher precision primitive to lower precision primitive for example If we try to assign int variable (which is in the range of byte variable) to byte variable then the compiler will throw an exception called "possible loss of precision". Eclipse IDE will suggest the solution as well as shown below. To avoid such problem we should use type casting which will instruct compiler for type conversion.

For cases where we try to assign smaller container variable to larger container variables we do not need of explicit casting. The compiler will take care of those type conversions. For example, we can assign byte variable or short variable to an int without any explicit casting.

Assigning Literal that is too large for a variable

When we try to assign a variable value which is too large (or out of range ) for a primitive variable then the compiler will throw exception “possible loss of precision” if we try to provide explicit cast then the compiler will accept it but narrowed down the value using two’s complement method. Let’s take an example of the byte which has 8-bit storage space and range -128 to 127. In below program we are trying to assign 129 literal value to byte primitive type which is out of range for byte so compiler converted it to -127 using two’s complement method. Refer link for two’s complement calculation (http://en.wikipedia.org/wiki/Two's_complement)

Java Code: Go to the editor

Reference variable assignment

We can assign newly created object to object reference variable as below

First line will do following things,

Makes a reference variable named s of type String
Creates a new String object on the heap memory
Assigns the newly created String object to the reference variables

You can also assign null to an object reference variable, which simply means the variable is not referring to any object. The below statement creates space for the Employee reference variable (the bit holder for a reference value) but doesn't create an actual Employee object.

Compound Assignment Operators

Sometime we need to modify the same variable value and reassigned it to a same reference variable. Java allows you to combine assignment and addition operators using a shorthand operator. For example, the preceding statement can be written as:

The += is called the addition assignment operator. Other shorthand operators are shown below table

Operator	Name	Example	Equivalent
+=	Addition assignment	i+=5;	i=i+5
-=	Subtraction assignment	j-=10;	j=j-10;
*=	Multiplication assignment	k*=2;	k=k*2;
/=	Division assignment	x/=10;	x=x/10;
%=	Remainder assignment	a%=4;	a=a%4;

Below is the sample program explaining assignment operators:

Assigning a value to can be straight forward or casting.
If we assign the value which is out of range of variable type then 2’s complement is assigned.
Java supports shortcut/compound assignment operator.

Java Code Editor:

Previous: Wrapper classes Next: Arithmetic Operator

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Java Classes: writing your own classes, constructors

Creating your own classes. Abstraction

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Museum of Antiquities.

Your task is to design an Artifact class. There are three types of artifacts kept at the museum. We know nothing about the first type except the serial number assigned by the museum (for example: 212121). For the second type, we know the serial number and the culture that created it (for example: 212121, "Aztecs"). For the third type, we know the serial number, the culture that created it, and the century it was created in (for example: 212121, "Aztecs", 12).

Create an Artifact class that describes the antiquities kept at the museum, and write the required set of constructors for the class. Then, in the main() method, create one artifact of each kind.

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More reading:

Java Assignment Operators

Operators	Example	Explanation
=	x = 9	Value 25 is assigned to x
+=	x += 9	This is same as x = x + 9
-=	x -= 9	This is same as x = x – 9
*=	x *= 9	This is same as x = x * 9
/=	x /= 9	This is same as x = x / 9
%=	x %= 9	This is same as x = x % 9

Java Assignment Operators example

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Assigning in Java?

Say I set int A = int B. When I change A after, it will not change the value of B. But when I set a SomeClass A = SomeClass B, and I change A's contents (like a.cost), it changes B.cost as well. Can someone explain this to me?

I thought Java is assigned by value, not reference?

5 Answers 5

Yes, it does - but the value of A is a reference, not a copy of the object itself.

I like to give the following analogy...

Suppose two people both have my address: that's like two variables of type House in Java. Now one of them comes and paints my door red. The second person will still see the red door if they visit:

Basically, remember a few rules and things will become clear:

The value of an expression in Java is never an object - only ever a reference or a primitive value
(Corollary of first point) A variable never holds an object - only ever a reference or a primitive value
Assignment (and argument passing) always copies the value, whether that value is a reference or a primitive value

What does "assigned by value" mean? Are you maybe confusing it with "pass by value/reference"?

At any rate, if you handle a class instance in Java, you are actually handling a reference to that class (much like a pointer in C/C++). Your assignment only copies the reference, so both A and B refer to the same instance, i.e. the data is shared, hence the result.

A is a reference to the object. So if you change the object internal state , it will be reflected to every other variable pointing to it.

If you re-assign A , then B will not change:

(Java is pass by value. Check this article about it.)

Java is strictly pass by value. When passing a reference by value only the reference is duplicated, not the object being referenced. – Russell Zornes Commented Oct 4, 2010 at 22:03
@Maven, of course, a stupid mistake, I thought one and wrote the other :) thanks – Bozho Commented Oct 4, 2010 at 22:07

In Java, your variables can be split into two categories: Objects, and everything else (int, long, byte, etc).

A primitive type (int, long, etc), holds whatever value you assign it. An object variable, by contrast, holds a reference to an object somewhere. So if you assign one object variable to another, you have copied the reference, both A and B point to the same object.

NOTE: Strings in Java are actually objects, not primitives, which beginners often assume.

Hope this helps

In java when you assign Object to Object its assign by reference. Int is non an Object in java so when you assign int to int its assign by value.

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Fixing ClassCastException: java.math.BigInteger cannot be cast to java.lang.Integer

The ClassCastException occurs when Java attempts to cast an object of one type to another, incompatible type. One common occurrence is the exception message: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Integer . This article explores why this exception happens and ways to prevent and fix it.

1. Understanding the Cause of ClassCastException

In Java, a ClassCastException arises when you attempt to cast an object to a type that it cannot be cast to. In the case of BigInteger and Integer , both represent numbers, but they belong to different classes and cannot be cast directly.

1.1 BigInteger vs Integer

BigInteger : Part of java.math package, which is used to represent arbitrarily large integers.
Integer : A wrapper class for primitive type int and part of the java.lang package, which stores a fixed 32-bit signed integer.

Because BigInteger can hold larger values than Integer , Java does not allow automatic casting between the two. Forcing such a cast causes a ClassCastException .

1.2 Reproducing the Issue

Consider the following scenario where data is fetched from a database or an external source that stores numeric values as BigInteger . Attempting to cast this to an Integer will throw the exception:

2. Safely Converting BigInteger to Integer in Java

To avoid this issue, we need to convert BigInteger to Integer properly rather than using direct casting.

2.1 Using BigInteger.intValue()

The simplest way to convert a BigInteger to an Integer is by calling the intValue() method on the BigInteger object. This converts the BigInteger to a primitive int , and it can be boxed to an Integer .

In this code snippet, BigInteger.intValue() safely converts the value to int . However, if the value exceeds the range of an int , it will result in data loss (the most significant bits are truncated).

2.2 Checking Value Range Before Conversion

If we are dealing with large numbers, it’s important to check whether the BigInteger can fit into an Integer without data loss.

This example demonstrates a range check to ensure the BigInteger can safely be converted to an int . The code initializes a BigInteger object named bigIntValue with the value "2147483648" . This value is much larger than what a Java Integer can represent, as the Integer type has a maximum capacity far smaller than the BigInteger object in this case.

To ensure the value can safely be converted, the code checks if the BigInteger falls within the range of an Integer . The maximum value an Integer can hold is 2,147,483,647 ( Integer.MAX_VALUE ), and the minimum is -2,147,483,648 ( Integer.MIN_VALUE ). The BigInteger.compareTo() method is used to compare bigIntValue against these limits. Since 2147483648 is greater than 2147483647 , the first comparison ( bigIntValue.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) <= 0 ) returns false .

Expected Output from running the code above is:

java biginteger integer classcast example output

Let’s consider the scenario where the BigInteger value passed is within the range of a Java Integer , i.e., less than 2147483647 .

In this case, since 123,456,789 is less than 2,147,483,647 , the comparison bigIntValue.compareTo(BigInteger.valueOf(Integer.MAX_VALUE)) <= 0 evaluates to true . Additionally, because 123,456,789 is greater than -2,147,483,648 , the second comparison also returns true . With both conditions met, the code safely converts the BigInteger to an int using the intValue() method. This conversion is successful as the value is within the valid range for an Integer .

Expected Output: The converted value, 123,456,789 , is printed as an Integer . There is no data loss or overflow because the value lies within the limits of the Integer type in Java.

3. Conclusion

In this article, we explored how to safely convert a BigInteger to an Integer in Java, particularly focusing on checking the value range to avoid ClassCastException . By verifying that the BigInteger value is within the valid limits of the Integer type, we can confidently perform conversions without the risk of data loss or overflow. This practice enhances the robustness of our Java applications and helps ensure that data remains accurate during numeric operations.

4. Download the Source Code

This was an example of Java ClassCast Exception when converting BigInteger to Integer.

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Java Tutorial

Java methods, java classes, java file handling, java how to's, java reference, java examples, java inheritance, java inheritance (subclass and superclass).

In Java, it is possible to inherit attributes and methods from one class to another. We group the "inheritance concept" into two categories:

subclass (child) - the class that inherits from another class
superclass (parent) - the class being inherited from

To inherit from a class, use the extends keyword.

In the example below, the Car class (subclass) inherits the attributes and methods from the Vehicle class (superclass):

Try it Yourself »

Did you notice the protected modifier in Vehicle?

We set the brand attribute in Vehicle to a protected access modifier . If it was set to private , the Car class would not be able to access it.

Why And When To Use "Inheritance"?

- It is useful for code reusability: reuse attributes and methods of an existing class when you create a new class.

Tip: Also take a look at the next chapter, Polymorphism , which uses inherited methods to perform different tasks.

The final Keyword

If you don't want other classes to inherit from a class, use the final keyword:

If you try to access a final class, Java will generate an error:

The output will be something like this:

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6 Sealed Classes

Sealed classes and interfaces restrict which other classes or interfaces may extend or implement them.

For background information about sealed classes and interfaces, see JEP 409 .

One of the primary purposes of inheritance is code reuse: When you want to create a new class and there is already a class that includes some of the code that you want, you can derive your new class from the existing class. In doing this, you can reuse the fields and methods of the existing class without having to write (and debug) them yourself.

However, what if you want to model the various possibilities that exist in a domain by defining its entities and determining how these entities should relate to each other? For example, you're working on a graphics library. You want to determine how your library should handle common geometric primitives like circles and squares. You've created a Shape class that these geometric primitives can extend. However, you're not interested in allowing any arbitrary class to extend Shape ; you don't want clients of your library declaring any further primitives. By sealing a class, you can specify which classes are permitted to extend it and prevent any other arbitrary class from doing so.

Declaring Sealed Classes

To seal a class, add the sealed modifier to its declaration. Then, after any extends and implements clauses, add the permits clause. This clause specifies the classes that may extend the sealed class.

For example, the following declaration of Shape specifies three permitted subclasses, Circle , Square , and Rectangle :

Figure 6-1 Shape.java

Define the following three permitted subclasses, Circle , Square , and Rectangle , in the same module or in the same package as the sealed class:

Figure 6-2 Circle.java

Figure 6-3 Square.java

Square is a non-sealed class . This type of class is explained in Constraints on Permitted Subclasses .

Figure 6-4 Rectangle.java

Rectangle has a further subclass, FilledRectangle :

Figure 6-5 FilledRectangle.java

Alternatively, you can define permitted subclasses in the same file as the sealed class. If you do so, then you can omit the permits clause:

Constraints on Permitted Subclasses

Permitted subclasses have the following constraints:

They must be accessible by the sealed class at compile time.

For example, to compile Shape.java , the compiler must be able to access all of the permitted classes of Shape : Circle.java , Square.java , and Rectangle.java . In addition, because Rectangle is a sealed class, the compiler also needs access to FilledRectangle.java .

They must directly extend the sealed class.

They must have exactly one of the following modifiers to describe how it continues the sealing initiated by its superclass:

final : Cannot be extended further

sealed : Can only be extended by its permitted subclasses

non-sealed : Can be extended by unknown subclasses; a sealed class cannot prevent its permitted subclasses from doing this

For example, the permitted subclasses of Shape demonstrate each of these three modifiers: Circle is final while Rectangle is sealed and Square is non-sealed .

They must be in the same module as the sealed class (if the sealed class is in a named module) or in the same package (if the sealed class is in the unnamed module, as in the Shape.java example).

For example, in the following declaration of com.example.graphics.Shape , its permitted subclasses are all in different packages. This example will compile only if Shape and all of its permitted subclasses are in the same named module.

Declaring Sealed Interfaces

Like sealed classes, to seal an interface, add the sealed modifier to its declaration. Then, after any extends clause, add the permits clause, which specifies the classes that can implement the sealed interface and the interfaces that can extend the sealed interface.

The following example declares a sealed interface named Expr . Only the classes ConstantExpr , PlusExpr , TimesExpr , and NegExpr may implement it:

Record Classes as Permitted Subclasses

You can name a record class in the permits clause of a sealed class or interface. See Record Classes for more information.

Record classes are implicitly final , so you can implement the previous example with record classes instead of ordinary classes:

Narrowing Reference Conversion and Disjoint Types

Narrowing reference conversion is one of the conversions used in type checking cast expressions. It enables an expression of a reference type S to be treated as an expression of a different reference type T , where S is not a subtype of T . A narrowing reference conversion may require a test at run time to validate that a value of type S is a legitimate value of type T . However, there are restrictions that prohibit conversion between certain pairs of types when it can be statically proven that no value can be of both types.

Consider the following example:

The cast expression Polygon p = (Polygon) r is allowed because it's possible that the Rectangle value r could be of type Polygon ; Rectangle is a subtype of Polygon . However, consider this example:

Even though the class Triangle and the interface Polygon are unrelated, the cast expression Polygon p = (Polygon) t is also allowed because at run time these types could be related. A developer could declare the following class:

However, there are cases where the compiler can deduce that there are no values (other than the null reference) shared between two types; these types are considered disjoint . For example:

Because the class UtahTeapot is final , it's impossible for a class to be a descendant of both Polygon and UtahTeapot . Therefore, Polygon and UtahTeapot are disjoint, and the cast statement Polygon p = (Polygon) u isn't allowed.

The compiler has been enhanced to navigate any sealed hierarchy to check if your cast statements are allowed. For example:

The first cast statement UtahTeapot u = (UtahTeapot) s isn't allowed; a Shape can only be a Polygon because Shape is sealed . However, as Polygon is non-sealed , it can be extended. However, no potential subtype of Polygon can extend UtahTeapot as UtahTeapot is final . Therefore, it's impossible for a Shape to be a UtahTeapot .

In contrast, the second cast statement Ring r = (Ring) s is allowed; it's possible for a Shape to be a Ring because Ring is not a final class.

APIs Related to Sealed Classes and Interfaces

The class java.lang.Class has two new methods related to sealed classes and interfaces:

java.lang.constant.ClassDesc[] permittedSubclasses() : Returns an array containing java.lang.constant.ClassDesc objects representing all the permitted subclasses of the class if it is sealed; returns an empty array if the class is not sealed
boolean isSealed() : Returns true if the given class or interface is sealed; returns false otherwise

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An Interview Question

How C# Generics is different from Java Generics

Kautilya Utkarsh
Sep 24, 2024
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In this article, we explore the distinctive features of C# generics and how they enhance programming efficiency. We compare generics with non-generic types, focusing on benefits like type safety, code reusability, and performance optimization.

Introduction

Generics in programming refer to a feature that allows a coder to write type-safe, flexible, and reusable code that works with different data types without specifying a concrete data type while coding. It lets you use a placeholder i.e. a “generic type”, which allows a coder to create classes, methods, and data structures that operate on various data types. The popular object-oriented programming languages i.e. “Java” and “C#” support generics, but both handle it in a unique way.

What are Generics?

Generics allows us to write Classes, methods, and interfaces that can work with any data type without losing type safety. Because of this, we don’t require rewriting code for each type; we can write it, and it will work on each type.

Let’s see an example of creating a generic list.

Generic: C# vs. Java

In Java, after compilation, generic type information is removed. This makes Java generics compatible with older versions but limits what you can do with them at runtime, so we say that Java uses type erasure. Where C# generics are reified, that means the type information is kept during both compile-time and runtime. It makes C# more flexible and runtime safety.

Let's understand this with examples,

As type information is retained at runtime in C#, we can inspect the generic type using reflection.

In Java we can’t use primitive type in generics, we use their wrapper classes like ‘Integer’ for “int” but C# supports the primitive classes directly in generics, which makes code simpler and more efficient. Let’s see.

C#’s ability to work with primitive types directly makes it faster and more convenient for developers.

Both languages allow you to make generic types flexible with inheritance, but they handle it differently: Java uses wildcards(?) for both covariance and contravariant, which confuses developers sometimes, whereas C# uses the “out” keyword for covariant types and “in” for contravariant types. This is generally easier to understand. Let’s see

C#’s out and in keywords make it clear whether a type is covariant or contravariant, reducing confusion.

Contravariance: we can pass an Animal to the method.

Constraints on Generics: Java vs. C#

Feature	Java	C#
Basic Constraints	extends keyword for subclasses or interfaces	where T: base class for subclassing
Constructor Constraint	Not available	where T : new() ensures a parameterless constructor
Reference Type Constraint	Not available	where T: class ensures the type is a reference type
Value Type Constraint	Not available	where T: struct ensures the type is a value type
Interface Constraint	Can implement interfaces	Can implement interfaces (where T: IInterface)
Type Safety	Limited by runtime type erasure	Full-type information is retained at runtime

Generics in both C# and Java allow for flexible, reusable code, but C# generics stand out due to their ability to handle primitive types, runtime type retention, and more powerful constraints. C#’s support for covariance and contravariance is also easier to understand compared to Java’s wildcard system. Understanding these differences can help you make better decisions when writing or transitioning between C# and Java code. C# generics offer more flexibility and performance benefits in many cases, especially when you need runtime type checks, work with primitive types, or require more control over type constraints.

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Java Exercises - Basic to Advanced Java Practice Programs with Solutions

Looking for Java exercises to test your Java skills, then explore our topic-wise Java practice exercises? Here you will get 25 plus practice problems that help to upscale your Java skills.

As we know Java is one of the most popular languages because of its robust and secure nature. But, programmers often find it difficult to find a platform for Java Practice Online. In this article, we have provided Java Practice Programs. That covers various Java Core Topics that can help users with Java Practice.

So, with ado further take a look at our free Java Exercises to practice and develop your Java programming skills. Our Java programming exercises Practice Questions from all the major topics like loops, object-oriented programming, exception handling, and many more.

Topic Wise Java Exercises List

Pattern Programs in Java
Array Programs in Java
String Programs in Java

Java Practice Problems for Searching Algorithms

Practice problems in java sorting algorithms, more java practice exercises.

Java Practice Programs

This Java exercise is designed to deepen your understanding and refine your Java coding skills, these programs offer hands-on experience in solving real-world problems, reinforcing key concepts, and mastering Java programming fundamentals. Whether you’re a beginner who looking to build a solid foundation or a professional developer aiming to sharpen your expertise, our Java practice programs provide an invaluable opportunity to sharpen your craft and excel in Java programming language .

By diving into these exercises, you’ll not only reinforce key concepts but also gain the practical experience needed to tackle real-world problems effectively. This hands-on practice is essential for mastering Java fundamentals and advancing your career as a proficient Java developer. To further enhance your skills, consider enrolling in our Java Course . This course offers comprehensive lessons and practical exercises, making it an excellent resource for both beginners and experienced developers.

1. Write Hello World Program in Java

The solution to the Problem is mentioned below:

2. Write a Program in Java to Add two Numbers.

Click here for the solution, 3. write a program to swap two numbers, 4. write a java program to convert integer numbers and binary numbers., 5. write a program to find factorial of a number in java., 6. write a java program to add two complex numbers., 7. write a program to calculate simple interest in java, 8. write a program to print the pascal’s triangle in java, 9. write a program to find sum of fibonacci series number, java exercise on pattern.

10. Write a Program to Print Pyramid Number Pattern in Java.

11. write a java program to print pattern., 12. write a java program to print pattern., 13. java program to print patterns., array exercises in java.

14. Write a Java Program to Compute the Sum of Array Elements.

15. write a java program to find the largest element in array, 16. write java program to find the tranpose of matrix, 17. java array program for array rotation, 18. java array program to remove duplicate elements from an array, 19. java array program to remove all occurrences of an element in an array, string exercises in java.

20. Java program to check whether a string is a Palindrome

21. java string program to check anagram, 22. java string program to reverse a string, 23. java string program to remove leading zeros.

24. Write a Java Program for Linear Search.

Time Complexity: O(N) Space Complexity: O(N)

25. Write a Binary Search Program in Java.

Time Complexity: O(logN) Space Complexity: O(N)

26. Java Program for Bubble Sort.

Time Complexity: O(N 2 ) Space Complexity: O(1)

27. Write a Program for Insertion Sort in Java.

28. java program for selection sort., 29. java program for merge sort..

Time Complexity: O(N logN) Space Complexity: O(N)

30. Java Program for QuickSort.

Time Complexity: O(N logN) Space Complexity: O(1)

After completing these Java exercises you are a step closer to becoming an advanced Java programmer. We hope these exercises have helped you understand Java better and you can solve beginner to advanced-level questions on Java programming.

Solving these Java programming exercise questions will not only help you master theory concepts but also grasp their practical applications, which is very useful in job interviews.

Java Array Exercise Java String Exercise Java Collection Exercise Click Here – To Practice Java Online please check our Practice Portal.

Java Exercise – FAQ

1. how to do java projects for beginners.

To do Java projects you need to know the fundamentals of Java programming. Then you need to select the desired Java project you want to work on. Plan and execute the code to finish the project. Some beginner-level Java projects include: Reversing a String Number Guessing Game Creating a Calculator Simple Banking Application Basic Android Application

2. Is Java easy for beginners?

As a programming language, Java is considered moderately easy to learn. It is unique from other languages due to its lengthy syntax. As a beginner, you can learn beginner to advanced Java in 6 to 18 months.

3. Why Java is used?

Java provides many advantages and uses, some of which are: Platform-independent Robust and secure Object-oriented Popular & in-demand Vast ecosystem

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Java Assignment Operators with Examples
Note: The compound assignment operator in Java performs implicit type casting. Let's consider a scenario where x is an int variable with a value of 5. int x = 5; If you want to add the double value 4.5 to the integer variable x and print its value, there are two methods to achieve this: Method 1: x = x + 4.5. Method 2: x += 4.5.
Classes and Objects in Java
A class in Java is a set of objects which shares common characteristics/ behavior and common properties/ attributes. It is a user-defined blueprint or prototype from which objects are created. For example, Student is a class while a particular student named Ravi is an object. Properties of Java Classes. Class is not a real-world entity.
Types of Assignment Operators in Java
Simple Assignment Operator (=) To assign a value to a variable, use the basic assignment operator (=). It is the most fundamental assignment operator in Java. It assigns the value on the right side of the operator to the variable on the left side. In the above example, the variable x is assigned the value 10.
Lecture 4: Classes and Objects
Lecture presentation on programming in Java. Topics include: object oriented programming, defining classes, using classes, constructors, methods, accessing fields, primitives versus references, references versus values, and static types and methods. ... assignment Programming Assignments. Download Course.
Assignment, Arithmetic, and Unary Operators (The Java™ Tutorials
This beginner Java tutorial describes fundamentals of programming in the Java programming language ... You saw this operator in the Bicycle class; it assigns the value on its right to the operand on its left: ... You can also combine the arithmetic operators with the simple assignment operator to create compound assignments. For example, x+=1; ...
Java Class and Objects (With Example)
Java Class and Objects. Java is an object-oriented programming language. The core concept of the object-oriented approach is to break complex problems into smaller objects. An object is any entity that has a state and behavior. For example, a bicycle is an object. It has. States: idle, first gear, etc. Behaviors: braking, accelerating, etc.
Compound assignment operators in Java
Java provides a class with name Class in java.lang package. Instances of the class Class represent classes and interfaces in a running Java application. The primitive Java types (boolean, byte, char, short, int, long, float, and double), and the keyword void are also represented as Class objects. It has no public constructor. Class objects are cons
Lesson: Classes and Objects (The Java™ Tutorials
Lesson: Classes and Objects. With the knowledge you now have of the basics of the Java programming language, you can learn to write your own classes. In this lesson, you will find information about defining your own classes, including declaring member variables, methods, and constructors. You will learn to use your classes to create objects ...
Classes (The Java™ Tutorials > Learning the Java Language > Classes and
Classes. The introduction to object-oriented concepts in the lesson titled Object-oriented Programming Concepts used a bicycle class as an example, with racing bikes, mountain bikes, and tandem bikes as subclasses. Here is sample code for a possible implementation of a Bicycle class, to give you an overview of a class declaration.
Java Assignment Operators
Compound Assignment Operators. Sometime we need to modify the same variable value and reassigned it to a same reference variable. Java allows you to combine assignment and addition operators using a shorthand operator. For example, the preceding statement can be written as: i +=8; //This is same as i = i+8; The += is called the addition ...
Java Classes and Objects
Java Classes/Objects. Java is an object-oriented programming language. Everything in Java is associated with classes and objects, along with its attributes and methods. For example: in real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake. A Class is like an object constructor, or ...
Java OOP (Object-Oriented Programming)
OOP is faster and easier to execute. OOP provides a clear structure for the programs. OOP helps to keep the Java code DRY "Don't Repeat Yourself", and makes the code easier to maintain, modify and debug. OOP makes it possible to create full reusable applications with less code and shorter development time. Tip: The "Don't Repeat Yourself" (DRY ...
Java Classes: writing your own classes, constructors
Hi! Today we will talk about classes in Java. You could say that classes form the cornerstone of Java programming. When you become a programmer, nearly your entire job will be writing your own classes that have various functions. Let's see what that means and how it works. :) As you know, Java is an object-oriented programming language.
Java Assignment Operators
The Java Assignment operators are used to assign the values to the declared variables. The equals ( = ) operator is the most commonly used Java assignment operator. For example: int i = 25; The table below displays all the assignment operators in the Java programming language. Operators.
Java Operators: Arithmetic, Relational, Logical and more
For example, + is an operator used for addition, while * is also an operator used for multiplication. Operators in Java can be classified into 5 types: Arithmetic Operators. Assignment Operators. Relational Operators. Logical Operators. Unary Operators. Bitwise Operators. 1.
Java Object Assignment
I am new to Java and I have some questions in mind regarding object assignment. For instance, Test t1 = new Test(); Test t2 = t1; t1.i=1; Assuming variable i is defined inside Test class, am I right to assume both t1 and t2 point to the same object where the modification t1.i=1 affects both t1 and t2?Actually I tested it out and seems like I was right.
Introduction to Programming in Java · Computer Science
Programming assignments. Creative programming assignments that we have used at Princeton. You can explore these resources via the sidebar at left. Introduction to Programming in Java. Our textbook Introduction to Programming in Java [ Amazon · Pearson · InformIT] is an interdisciplinary approach to the traditional CS1 curriculum with Java. We ...
Understanding Classes and Objects in Java
Classes: A class is a user-defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one type. Classes are required in OOPs because: It provides the template for creating objects, which can bind code into data. It has definitions of methods and data.
Java Constructors (With Examples)
In the above example, we have created a constructor named Main(). Inside the constructor, we are initializing the value of the name variable. Notice the statement creating an object of the Main class. Main obj = new Main(); Here, when the object is created, the Main() constructor is called. And the value of the name variable is initialized.
Assigning in Java?
Assignment (and argument passing) always copies the value, whether that value is a reference or a primitive value; Share. Follow ... At any rate, if you handle a class instance in Java, you are actually handling a reference to that class (much like a pointer in C/C++). Your assignment only copies the reference, so both A and B refer to the same ...
Fixing ClassCastException: java.math.BigInteger cannot be cast to java
The ClassCastException occurs when Java attempts to cast an object of one type to another, incompatible type. One common occurrence is the exception message: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Integer. This article explores why this exception happens and ways to prevent and fix it. 1.
Java Inheritance (Subclass and Superclass)
Java Inheritance (Subclass and Superclass) In Java, it is possible to inherit attributes and methods from one class to another. We group the "inheritance concept" into two categories: subclass (child) - the class that inherits from another class. superclass (parent) - the class being inherited from. To inherit from a class, use the extends keyword.
6 Sealed Classes
Declaring Sealed Classes. To seal a class, add the sealed modifier to its declaration. Then, after any extends and implements clauses, add the permits clause. This clause specifies the classes that may extend the sealed class. For example, the following declaration of Shape specifies three permitted subclasses, Circle, Square, and Rectangle:
How C# Generics is different from Java Generics
Generic: C# vs. Java. In Java, after compilation, generic type information is removed. This makes Java generics compatible with older versions but limits what you can do with them at runtime, so we say that Java uses type erasure. Where C# generics are reified, that means the type information is kept during both compile-time and runtime.
Java Exercises
Java is also an object-oriented language, which means that it organizes data and behaviour into reusable units called classes and objects. Java is known for its portability, performance, security, and robust. 2 min read. Java Threading Programs - Basic to Advanced.

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Fixing ClassCastException: java.math.BigInteger cannot be cast to java.lang.Integer

1. Understanding the Cause of ClassCastException

1.1 BigInteger vs Integer

1.2 Reproducing the Issue

2. Safely Converting BigInteger to Integer in Java

2.1 Using BigInteger.intValue()

2.2 Checking Value Range Before Conversion

3. Conclusion

4. Download the Source Code

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Java 8 Streams – Group By Multiple Fields with Collectors.groupingBy()

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Why And When To Use "Inheritance"?

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6 Sealed Classes

How C# Generics is different from Java Generics

Introduction

What are Generics?

Generic: C# vs. Java

Constraints on Generics: Java vs. C#

Java Exercises - Basic to Advanced Java Practice Programs with Solutions

Java Practice Problems for Searching Algorithms

Java Practice Programs

1. Write Hello World Program in Java

2. Write a Program in Java to Add two Numbers.

10. Write a Program to Print Pyramid Number Pattern in Java.

14. Write a Java Program to Compute the Sum of Array Elements.