assignment on java

The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases. See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.

Assignment, Arithmetic, and Unary Operators

The simple assignment operator.

One of the most common operators that you'll encounter is the simple assignment operator " = ". You saw this operator in the Bicycle class; it assigns the value on its right to the operand on its left:

This operator can also be used on objects to assign object references , as discussed in Creating Objects .

The Arithmetic Operators

The Java programming language provides operators that perform addition, subtraction, multiplication, and division. There's a good chance you'll recognize them by their counterparts in basic mathematics. The only symbol that might look new to you is " % ", which divides one operand by another and returns the remainder as its result.

Operator	Description
	Additive operator (also used for String concatenation)
	Subtraction operator
	Multiplication operator
	Division operator
	Remainder operator

The following program, ArithmeticDemo , tests the arithmetic operators.

This program prints the following:

You can also combine the arithmetic operators with the simple assignment operator to create compound assignments . For example, x+=1; and x=x+1; both increment the value of x by 1.

The + operator can also be used for concatenating (joining) two strings together, as shown in the following ConcatDemo program:

By the end of this program, the variable thirdString contains "This is a concatenated string.", which gets printed to standard output.

The Unary Operators

The unary operators require only one operand; they perform various operations such as incrementing/decrementing a value by one, negating an expression, or inverting the value of a boolean.

Operator	Description
	Unary plus operator; indicates positive value (numbers are positive without this, however)
	Unary minus operator; negates an expression
	Increment operator; increments a value by 1
	Decrement operator; decrements a value by 1
	Logical complement operator; inverts the value of a boolean

The following program, UnaryDemo , tests the unary operators:

The increment/decrement operators can be applied before (prefix) or after (postfix) the operand. The code result++; and ++result; will both end in result being incremented by one. The only difference is that the prefix version ( ++result ) evaluates to the incremented value, whereas the postfix version ( result++ ) evaluates to the original value. If you are just performing a simple increment/decrement, it doesn't really matter which version you choose. But if you use this operator in part of a larger expression, the one that you choose may make a significant difference.

The following program, PrePostDemo , illustrates the prefix/postfix unary increment operator:

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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 Synchronization

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Java Networking

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Java Applet

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Java Reflection

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Java Conversion

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Java Array Class
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Java AtomicInteger Class
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Java AtomicLong Methods
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Java Authenticator
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Java BigDecimal class
intValueExact()
movePointLeft()
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Big Integer Class
bitLength()
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Java Boolean class
booleanValue()
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Java Byte Class

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Java Collections class
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Java Compiler Class

Java Compiler
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CopyOnWriteArrayList

Java CopyOnWriteArrayList
lastIndexOf()

Java Math Methods

Math.round()
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Math.nextAfter()
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Math.random()
Math.rint()
Math.hypot()
Math.getExponent()
Math.IEEEremainder()
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Math.log10()
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LinkedBlockingDeque

Java LinkedBlockingDeque
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Java Long class

LinkedTransferQueue

Java LinkedTransferQueue
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Difference between Array and ArrayList
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How to reverse ArrayList in Java
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Difference between length of array and size() of ArrayList in Java
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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()
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Java Number Class

Java Phaser Class

Java Phaser
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getParent()
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ArrayList Methods

listIterator()
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Java Thread Methods

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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
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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
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Finding the Maximum Points on a Line in Java
Get Local IP Address in Java
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Java isAlive() Method
Java Line Feed Character
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Java Maps to JSON
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Swap First and Last Digit of a Number in Java
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Best Automation Frameworks for Java
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Caching Mechanism in Java
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Cryptosystem Project in Java
Farthest from Zero Program in Java
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Unreachable Code or Statement in Java
What is Architecture Neutral in Java
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Dyck Path in Java
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Java Program to open the command prompt and insert commands
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Compare Two Excel Files in Java
Consecutive Prime Sum Program in Java
Count distinct XOR values among pairs using numbers in range 1 to N
Difference Between Two Tier and Three Tier Architecture in Java
Different Ways of Reading a Text File in Java
Empty Array in Java
FCFS Program in Java with Arrival Time
Immutable Map in Java
K-4 City Program in Java
Kahn's algorithm for Topological Sorting in Java
Most Popular Java Backend Tools
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Applet Program in Java to Draw House with Output
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Bitset Class in Java
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Number of digits in N factorial to the power N in Java
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Immutable Class with Mutable Object in Java
Java instanceOf() Generics
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Elements of Java Programming
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Interface Vs. Abstract Class After Java 8
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Version Enhancements in Exception Handling introduced in Java SE 7
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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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Java - Assignment Operators with Examples

Java assignment operators.

Following are the assignment operators supported by Java language −

Operator	Description	Example
=	Simple assignment operator. Assigns values from right side operands to left side operand.	C = A + B will assign value of A + B into C
+=	Add AND assignment operator. It adds right operand to the left operand and assign the result to left operand.	C += A is equivalent to C = C + A
-=	Subtract AND assignment operator. It subtracts right operand from the left operand and assign the result to left operand.	C -= A is equivalent to C = C − A
*=	Multiply AND assignment operator. It multiplies right operand with the left operand and assign the result to left operand.	C = A is equivalent to C = C A
/=	Divide AND assignment operator. It divides left operand with the right operand and assign the result to left operand.	C /= A is equivalent to C = C / A
%=	Modulus AND assignment operator. It takes modulus using two operands and assign the result to left operand.	C %= A is equivalent to C = C % A
<<=	Left shift AND assignment operator.	C <<= 2 is same as C = C << 2
>>=	Right shift AND assignment operator.	C >>= 2 is same as C = C >> 2
&=	Bitwise AND assignment operator.	C &= 2 is same as C = C & 2
^=	bitwise exclusive OR and assignment operator.	C ^= 2 is same as C = C ^ 2
\|=	bitwise inclusive OR and assignment operator.	C \|= 2 is same as C = C \| 2

The following programs are simple examples which demonstrate the assignment operators. Copy and paste the following Java programs as Test.java file, and compile and run the programs −

In this example, we're creating three variables a,b and c and using assignment operators . We've performed simple assignment, addition AND assignment, subtraction AND assignment and multiplication AND assignment operations and printed the results.

In this example, we're creating two variables a and c and using assignment operators . We've performed Divide AND assignment, Multiply AND assignment, Modulus AND assignment, bitwise exclusive OR AND assignment, OR AND assignment operations and printed the results.

In this example, we're creating two variables a and c and using assignment operators . We've performed Left shift AND assignment, Right shift AND assignment, operations and printed the results.

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Types of Assignment Operators in Java

1. simple assignment operator (=):, explanation, 2. addition assignment operator (+=) :, 3. subtraction operator (-=):, 4. multiplication operator (*=):, 5. division operator (/=):, 6. modulus assignment operator (%=):, example of assignment operator in java, q1. can i use multiple assignment operators in a single statement, q2. are there any other compound assignment operators in java, q3. how many types of assignment operators, live classes schedule.

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Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering embedded and mobile applications, games, Web-based content, and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop, deploy and use exciting applications and services.

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Hope, these exercises help you to improve your Java programming coding skills. Currently, following sections are available, we are working hard to add more exercises .... Happy Coding!

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Operators are symbols that perform operations on variables and values. 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 Arithmetic Operators

Arithmetic operators are used to perform arithmetic operations on variables and data. For example,

Here, the + operator is used to add two variables a and b . Similarly, there are various other arithmetic operators in Java.

Operator	Operation
	Addition
	Subtraction
	Multiplication
	Division
	Modulo Operation (Remainder after division)

Example 1: Arithmetic Operators

In the above example, we have used + , - , and * operators to compute addition, subtraction, and multiplication operations.

/ Division Operator

Note the operation, a / b in our program. The / operator is the division operator.

If we use the division operator with two integers, then the resulting quotient will also be an integer. And, if one of the operands is a floating-point number, we will get the result will also be in floating-point.

% Modulo Operator

The modulo operator % computes the remainder. When a = 7 is divided by b = 4 , the remainder is 3 .

Note : The % operator is mainly used with integers.

2. Java Assignment Operators

Assignment operators are used in Java to assign values to variables. For example,

Here, = is the assignment operator. It assigns the value on its right to the variable on its left. That is, 5 is assigned to the variable age .

Let's see some more assignment operators available in Java.

Operator	Example	Equivalent to

Example 2: Assignment Operators

3. java relational operators.

Relational operators are used to check the relationship between two operands. For example,

Here, < operator is the relational operator. It checks if a is less than b or not.

It returns either true or false .

Operator	Description	Example
	Is Equal To	returns
	Not Equal To	returns
	Greater Than	returns
	Less Than	returns
	Greater Than or Equal To	returns
	Less Than or Equal To	returns

Example 3: Relational Operators

Note : Relational operators are used in decision making and loops.

4. Java Logical Operators

Logical operators are used to check whether an expression is true or false . They are used in decision making.

Operator	Example	Meaning
(Logical AND)	expression1 expression2	only if both and are
(Logical OR)	expression1 expression2	if either or is
(Logical NOT)	expression	if is and vice versa

Example 4: Logical Operators

Working of Program

(5 > 3) && (8 > 5) returns true because both (5 > 3) and (8 > 5) are true .
(5 > 3) && (8 < 5) returns false because the expression (8 < 5) is false .
(5 < 3) || (8 > 5) returns true because the expression (8 > 5) is true .
(5 > 3) || (8 < 5) returns true because the expression (5 > 3) is true .
(5 < 3) || (8 < 5) returns false because both (5 < 3) and (8 < 5) are false .
!(5 == 3) returns true because 5 == 3 is false .
!(5 > 3) returns false because 5 > 3 is true .

5. Java Unary Operators

Unary operators are used with only one operand. For example, ++ is a unary operator that increases the value of a variable by 1 . That is, ++5 will return 6 .

Different types of unary operators are:

Operator	Meaning
	: not necessary to use since numbers are positive without using it
	: inverts the sign of an expression
	: increments value by 1
	: decrements value by 1
	: inverts the value of a boolean

Increment and Decrement Operators

Java also provides increment and decrement operators: ++ and -- respectively. ++ increases the value of the operand by 1 , while -- decrease it by 1 . For example,

Here, the value of num gets increased to 6 from its initial value of 5 .

Example 5: Increment and Decrement Operators

In the above program, we have used the ++ and -- operator as prefixes (++a, --b) . We can also use these operators as postfix (a++, b++) .

There is a slight difference when these operators are used as prefix versus when they are used as a postfix.

To learn more about these operators, visit increment and decrement operators .

6. Java Bitwise Operators

Bitwise operators in Java are used to perform operations on individual bits. For example,

Here, ~ is a bitwise operator. It inverts the value of each bit ( 0 to 1 and 1 to 0 ).

The various bitwise operators present in Java are:

Operator	Description
	Bitwise Complement
	Left Shift
	Right Shift
	Unsigned Right Shift
	Bitwise AND
	Bitwise exclusive OR

These operators are not generally used in Java. To learn more, visit Java Bitwise and Bit Shift Operators .

Other operators

Besides these operators, there are other additional operators in Java.

The instanceof operator checks whether an object is an instanceof a particular class. For example,

Here, str is an instance of the String class. Hence, the instanceof operator returns true . To learn more, visit Java instanceof .

The ternary operator (conditional operator) is shorthand for the if-then-else statement. For example,

Here's how it works.

If the Expression is true , expression1 is assigned to the variable .
If the Expression is false , expression2 is assigned to the variable .

Let's see an example of a ternary operator.

In the above example, we have used the ternary operator to check if the year is a leap year or not. To learn more, visit the Java ternary operator .

Now that you know about Java operators, it's time to know about the order in which operators are evaluated. To learn more, visit Java Operator Precedence .

Introduction
Java Arithmetic Operators
Java Assignment Operators
Java Relational Operators
Java Logical Operators
Java Unary Operators
Java Bitwise Operators

Before we wrap up, let’s put your knowledge of Java Operators: Arithmetic, Relational, Logical and more to the test! Can you solve the following challenge?

Write a function to return the largest of two given numbers.

Return the largest of two given numbers num1 and num2 .
For example, if num1 = 4 and num2 = 5 , the expected output is 5 .

Sorry about that.

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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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Java provides many types of operators to perform a variety of calculations and functions, such as logical , arithmetic , relational , and others. With so many operators to choose from, it helps to group them based on the type of functionality they provide. This programming tutorial will focus on Java’s numerous a ssignment operators.

Before we begin, however, you may want to bookmark our other tutorials on Java operators, which include:

Arithmetic Operators
Comparison Operators
Conditional Operators
Logical Operators
Bitwise and Shift Operators

Assignment Operators in Java

As the name conveys, assignment operators are used to assign values to a variable using the following syntax:

The left side operand of the assignment operator must be a variable, whereas the right side operand of the assignment operator may be a literal value or another variable. Moreover, the value or variable on the right side must be of the same data type of the operand on the left side. Otherwise, the compiler will raise an error. Assignment operators have a right to left associativity in that the value given on the right-hand side of the operator is assigned to the variable on the left. Therefore, the right-hand side variable must be declared before assignment.

You can learn more about variables in our programming tutorial: Working with Java Variables .

Types of Assignment Operators in Java

Java assignment operators are classified into two types: simple and compound .

The Simple assignment operator is the equals ( = ) sign, which is the most straightforward of the bunch. It simply assigns the value or variable on the right to the variable on the left.

Compound operators are comprised of both an arithmetic, bitwise, or shift operator in addition to the equals ( = ) sign.

Equals Operator (=) Java Example

First, let’s learn to use the one-and-only simple assignment operator – the Equals ( = ) operator – with the help of a Java program. It includes two assignments: a literal value to num1 and the num1 variable to num2 , after which both are printed to the console to show that the values have been assigned to the numbers:

The += Operator Java Example

A compound of the + and = operators, the += adds the current value of the variable on the left to the value on the right before assigning the result to the operand on the left. Here is some sample code to demonstrate how to use the += operator in Java:

The -= Operator Java Example

Made up of the – and = operators, the -= first subtracts the variable’s value on the right from the current value of the variable on the left before assigning the result to the operand on the left. We can see it at work below in the following code example showing how to decrement in Java using the -= operator:

The *= Operator Java Example

This Java operator is comprised of the * and = operators. It operates by multiplying the current value of the variable on the left to the value on the right and then assigning the result to the operand on the left. Here’s a program that shows the *= operator in action:

The /= Operator Java Example

A combination of the / and = operators, the /= Operator divides the current value of the variable on the left by the value on the right and then assigns the quotient to the operand on the left. Here is some example code showing how to use the /= operator in Java:

%= Operator Java Example

The %= operator includes both the % and = operators. As seen in the program below, it divides the current value of the variable on the left by the value on the right and then assigns the remainder to the operand on the left:

Compound Bitwise and Shift Operators in Java

The Bitwise and Shift Operators that we just recently covered can also be utilized in compound form as seen in the list below:

&= – Compound bitwise Assignment operator.
^= – Compound bitwise ^ assignment operator.
>>= – Compound right shift assignment operator.
>>>= – Compound right shift filled 0 assignment operator.
<<= – Compound left shift assignment operator.

The following program demonstrates the working of all the Compound Bitwise and Shift Operators :

Final Thoughts on Java Assignment Operators

This programming tutorial presented an overview of Java’s simple and compound assignment Operators. An essential building block to any programming language, developers would be unable to store any data in their programs without them. Though not quite as indispensable as the equals operator, compound operators are great time savers, allowing you to perform arithmetic and bitwise operations and assignment in a single line of code.

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Java's Basic and Shorthand Assignment Operators

Reference assignment, primitive assignment, primitive casting, shorthand assignment operators, basic assignment operator.

Java's basic assignment operator is a single equals-to (=) sign that assigns the right-hand side value to the left-hand side operand. On left side of the assignment operator there must be a variable that can hold the value assigned to it. Assignment operator operates on both primitive and reference types. It has the following syntax: var = expression; Note that the type of var must be compatible with the type of expression .

Chaining of assignment operator is also possible where we can create a chain of assignments in order to assign a single value to multiple variables. For example,

The above piece of code sets the variables x, y, and z to 100 using a single statement. This works because the = is an operator that yields the value of the right-hand expression. Thus, the value of z = 100 is 100, which is then assigned to y , which in turn is assigned to x . Using a "chain of assignment" is an easy way to set a group of variables to a common value.

A variable referring to an object is a reference variable not an object. We can assign a newly created object to an object reference variable as follows:

The above line of code performs three tasks

Creates a reference variable named st1 , of type Student .
Creates a new Student object on the heap.
Assigns the newly created Student object to the reference variable st1

We can also assign null to an object reference variable, which simply means the variable is not referring to any object:

Above line of code creates space for the Student reference variable st2 but doesn't create an actual Student object.

Note that, we can also use a reference variable to refer to any object that is a subclass of the declared reference variable type.

Primitive variables can be assigned either by using a literal or the result of an expression. For example,

The most important point that we should keep in mind, while assigning primitive types is if we are going to assign a bigger value to a smaller type, we have to typecast it properly. In Above piece of code the literal integer 130 is implicitly an int but it is acceptable here because the variable x is of type int . It gets weird if you try 130 to assign to a byte variable. For example, The below piece of code will not compile because literal 130 is implicitly an integer and it does not fit into a smaller type byte x . Likewise, byte c = a + b will also not compile because the result of an expression involving anything int-sized or smaller is always an int .

Casting lets us convert primitive values from one type to another (specially from bigger to smaller types). Casts can be implicit or explicit. An implicit cast means we don't have to write code for the cast; the conversion happens automatically. Typically, an implicit cast happens when we do a widening conversion. In other words, putting a smaller thing (say, a byte ) into a bigger container (like an int ). Remember those "possible loss of precision" compiler errors we saw during assignments. Those happened when we tried to put a larger thing (say, an int ) into a smaller container (like a byte ). The large-value-into-small-container conversion is referred to as narrowing and requires an explicit cast, where we tell the compiler that we are aware of the danger and accept full responsibility.

As a final note on casting, it is very important to note that the shorthand assignment operators let us perform addition, subtraction, multiplication or division without putting in an explicit cast. In fact, +=, -=, *=, and /= will all put in an implicit cast. Below is an example:

In addition to the basic assignment operator, Java also defines 12 shorthand assignment operators that combine assignment with the 5 arithmetic operators ( += , -= , *= , /= , %= ) and the 6 bitwise and shift operators ( &= , |= , ^= , <<= , >>= , >>>= ). For example, the += operator reads the value of the left variable, adds the value of the right operand to it, stores the sum back into the left variable as a side effect, and returns the sum as the value of the expression. Thus, the expression x += 2 is almost the same x = x + 2 .

The difference between these two expressions is that when we use the += operator, the left operand is evaluated only once. This makes a difference when that operand has a side effect. Consider the following two expressions a[i++] += 2; and a[i++] = a[i++] + 2; , which are not equivalent:

In this tutorial we discussed basic and shorthand (compound) assignment operators of Java. Hope you have enjoyed reading this tutorial. Please do write us if you have any suggestion/comment or come across any error on this page. Thanks for reading!

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Java Object Assignment

I am new to Java and I have some questions in mind regarding object assignment. For instance,

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. However when I try the same thing on String , the modification happens only on one side where the other side is unaffected. What is the reason behind this?

Edit: The case I tried with String.

I realise my mistake by testing the cases on String since it is immutable. The situation where I thought s1="1" modify the string is in fact returning the reference of "1" to the s1. Nevertheless, my question remains. Does Test t2 = t1; cause both t2 and t1 point to the same object or each now have their own objects? Does this situation applies on all objects on Java?

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What do you mean under 'try same thing on String'? There are no methods in String object to modify the string itself. Please read documentation carefully. – DRCB Commented Jun 13, 2012 at 9:20
If you post the code of the test you're doing on String, we can be more specific on what you're doing wrong – Andrea Parodi Commented Jun 13, 2012 at 9:21

8 Answers 8

You are right, but Strings are a special case; they are immutable and act like primitives in this case.

I quote http://docs.oracle.com/javase/tutorial/java/data/strings.html :

Note: The String class is immutable, so that once it is created a String object cannot be changed. The String class has a number of methods, some of which will be discussed below, that appear to modify strings. Since strings are immutable, what these methods really do is create and return a new string that contains the result of the operation.

This is what makes strings a special case. If you don't know this, you might expect the methods discussed in the quote not to return new strings, wich would lead to unexpected results.

@user1238193

Considering your following question: "Does Test t2 = t1; cause both t2 and t1 point to the same object or each now have their own objects? Does this situation applies on all objects on Java?"

t1 and t2 will point to the same object. This is true for any java object (immutable objects included)

3 There are no "special cases". Assignment to a reference of any type changes the object it points to, without affecting the object it used to point to. – newacct Commented Jun 13, 2012 at 17:52
Strings are a special case; they are objects, but they are immutable, meaning if you try to change them by for example String.replace you'll get a new object instead of the same object mutated. – Tom Commented Jun 13, 2012 at 21:04
3 No, String simply happens to not have any method that changes it. "try to change them" does not make sense; you cannot "try" to do something that doesn't exist. String.replace gives you a new object -- what's your point? That is what its documentation says it will do. Integer and many other classes are immutable. You can trivially write a class that is immutable, by making fields private and providing no methods to change its fields. And in any case, mutability is irrelevant to the question, which originally was about changing a field on Test , but there are no public fields on String – newacct Commented Jun 13, 2012 at 22:35
and then what do you do with the String pool, all classes have something like that ? – Tom Commented Jun 14, 2012 at 4:11
2 the String interning pool is completely irrelevant to this question or mutability. Any class may or may not have an interning pool like String – newacct Commented Jun 14, 2012 at 5:56

You are right with your first assumption. With the following line of code:

you create a new Test object, and in the same time you create a Test reference named t1 to refer to it.

At the second line of the code you posted:

You are actually creating another Test reference, and you assign it to refer to the same object that t1 refers to.

So t1.i = 1; will affect t2.i for it is the same object after all.

As for the Strings, Strings are immutable and can not be modified after instantiated.

Regarding your edit:

They will print different results, because when you actually say

you are actually binding s1 to another String object, but s2 will still be refering to the object with value "0".

You are doing completely different things in the two cases. In the first case, with t1.i = 1; , you are modifying the object pointed to by t1 . In the second case, with t1 = "1"; , you are changing the reference to point to another object (similar to when you did t2 = t1; .

If you do the same thing to Test that you did in the second case, you would get the same result (assuming Test has a constructor that takes an integer):

People mention that String is immutable. But that is irrelevant and there is no concept of "mutability" in the language and there is no difference between how "mutable" and "immutable" classes work. We informally say a class is "immutable" if it happens to not have any fields you can set or any methods that can change its internal content. Such is the case with String . But a mutable class would work the exact same way if you simply do not do anything to mutate it.

Before downvoting and commenting on other answers, please kindly bother to see the question edit history. That'll give you a hint as to why many answers,saying the same thing, were upvoted. – Kazekage Gaara Commented Jun 13, 2012 at 18:09

You are absolutely right, as both t1 and t2 refering to same object, any chane in the object state will affect to both.

String is an immutable object. So it cannot be modified at all. see this for more info on immutable object in java.

That doesn't explain the problem. The same thing is true of Test : Test s1 = new Test(2); Test s2 = s1; s1 = new Test(1); – newacct Commented Jun 13, 2012 at 17:55

String objects are immutable .

Does Test t2 = t1; cause both t2 and t1 point to the same object or each now have their own objects?

Yes. Although t2 is a new reference, but it will point to the same object, because you told it to do so. Create a new reference t2 of type Test and let it point to the same object which t1 is pointing at.

But, when you do this with String s and then do something like s1 = "1" ; you are making s1 point to another String object. You can think of it in terms s1 = new String(1); .

@newacct The OP edited the post later on. Initial post was answerable with these few words only. I'll edit my post now. Thanks for pointing it out though. – Kazekage Gaara Commented Jun 13, 2012 at 18:02
1 Even before the edit, "String is immutable" is not the correct answer. He said "when I tried the same thing on String"; the answer should be "What you said is impossible. It is impossible to do the same thing to String" – newacct Commented Jun 13, 2012 at 18:50

String are object like any other. So any variable you assign them refer to the very same instance of the object, like you are doing with your test object.

But keep in mind that String have no field you can set like you do on Test, so you basically cannot do the same test, so there is no way to port your code from Test object to String object.

You get opposite behaviour using primitive types, such long,int etc. They are assigned to variables "by value", so if you do

t2 still has value 12

Use StringBuilder as an example would be a litter bit clearer. Following example shows the object assignment just using the reference instead of the value.

{ StringBuilder str = new StringBuilder();

Because java uses the concept of string literal. Suppose there are 5 reference variables, all refers to one object "0".If one reference variable changes the value of the object, it will be affected to all the reference variables. That is why string objects are immutable in java.

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