assignment statement java program

Java Arrays
Java Strings
Java Collection
Java 8 Tutorial
Java Multithreading
Java Exception Handling
Java Programs
Java Project
Java Collections Interview
Java Interview Questions
Spring Boot
Java Tutorial

Overview of Java

Introduction to Java
The Complete History of Java Programming Language
C++ vs Java vs Python
How to Download and Install Java for 64 bit machine?
Setting up the environment in Java
How to Download and Install Eclipse on Windows?
JDK in Java
How JVM Works - JVM Architecture?
Differences between JDK, JRE and JVM
Just In Time Compiler
Difference between JIT and JVM in Java
Difference between Byte Code and Machine Code
How is Java platform independent?

Basics of Java

Java Basic Syntax
Java Hello World Program
Java Data Types
Primitive data type vs. Object data type in Java with Examples
Java Identifiers

Operators in Java

Java Variables
Scope of Variables In Java

Wrapper Classes in Java

Input/output in java.

How to Take Input From User in Java?
Scanner Class in Java
Java.io.BufferedReader Class in Java
Difference Between Scanner and BufferedReader Class in Java
Ways to read input from console in Java
System.out.println in Java
Difference between print() and println() in Java
Formatted Output in Java using printf()
Fast I/O in Java in Competitive Programming

Flow Control in Java

Decision Making in Java (if, if-else, switch, break, continue, jump)
Java if statement with Examples
Java if-else
Java if-else-if ladder with Examples
Loops in Java
For Loop in Java
Java while loop with Examples
Java do-while loop with Examples
For-each loop in Java
Continue Statement in Java
Break statement in Java
Usage of Break keyword in Java
return keyword in Java
Java Arithmetic Operators with Examples
Java Unary Operator with Examples

Java Assignment Operators with Examples

Java Relational Operators with Examples
Java Logical Operators with Examples
Java Ternary Operator with Examples
Bitwise Operators in Java
Strings in Java
String class in Java
Java.lang.String class in Java | Set 2
Why Java Strings are Immutable?
StringBuffer class in Java
StringBuilder Class in Java with Examples
String vs StringBuilder vs StringBuffer in Java
StringTokenizer Class in Java
StringTokenizer Methods in Java with Examples | Set 2
StringJoiner Class in Java
Arrays in Java
Arrays class in Java
Multidimensional Arrays in Java
Different Ways To Declare And Initialize 2-D Array in Java
Jagged Array in Java
Final Arrays in Java
Reflection Array Class in Java
util.Arrays vs reflect.Array in Java with Examples

OOPS in Java

Object Oriented Programming (OOPs) Concept in Java
Why Java is not a purely Object-Oriented Language?
Classes and Objects in Java
Naming Conventions in Java
Java Methods

Access Modifiers in Java

Java Constructors
Four Main Object Oriented Programming Concepts of Java

Inheritance in Java

Abstraction in java, encapsulation in java, polymorphism in java, interfaces in java.

'this' reference in Java
Inheritance and Constructors in Java
Java and Multiple Inheritance
Interfaces and Inheritance in Java
Association, Composition and Aggregation in Java
Comparison of Inheritance in C++ and Java
abstract keyword in java
Abstract Class in Java
Difference between Abstract Class and Interface in Java
Control Abstraction in Java with Examples
Difference Between Data Hiding and Abstraction in Java
Difference between Abstraction and Encapsulation in Java with Examples
Difference between Inheritance and Polymorphism
Dynamic Method Dispatch or Runtime Polymorphism in Java
Difference between Compile-time and Run-time Polymorphism in Java

Constructors in Java

Copy Constructor in Java
Constructor Overloading in Java
Constructor Chaining In Java with Examples
Private Constructors and Singleton Classes in Java

Methods in Java

Static methods vs Instance methods in Java
Abstract Method in Java with Examples
Overriding in Java
Method Overloading in Java
Difference Between Method Overloading and Method Overriding in Java
Differences between Interface and Class in Java
Functional Interfaces in Java
Nested Interface in Java
Marker interface in Java
Comparator Interface in Java with Examples
Need of Wrapper Classes in Java
Different Ways to Create the Instances of Wrapper Classes in Java
Character Class in Java
Java.Lang.Byte class in Java
Java.Lang.Short class in Java
Java.lang.Integer class in Java
Java.Lang.Long class in Java
Java.Lang.Float class in Java
Java.Lang.Double Class in Java
Java.lang.Boolean Class in Java
Autoboxing and Unboxing in Java
Type conversion in Java with Examples

Keywords in Java

Java Keywords
Important Keywords in Java
Super Keyword in Java
final Keyword in Java
static Keyword in Java
enum in Java
transient keyword in Java
volatile Keyword in Java
final, finally and finalize in Java
Public vs Protected vs Package vs Private Access Modifier in Java
Access and Non Access Modifiers in Java

Memory Allocation in Java

Java Memory Management
How are Java objects stored in memory?
Stack vs Heap Memory Allocation
How many types of memory areas are allocated by JVM?
Garbage Collection in Java
Types of JVM Garbage Collectors in Java with implementation details
Memory leaks in Java
Java Virtual Machine (JVM) Stack Area

Classes of Java

Understanding Classes and Objects in Java
Singleton Method Design Pattern in Java
Object Class in Java
Inner Class in Java
Throwable Class in Java with Examples

Packages in Java

Packages In Java
How to Create a Package in Java?
Java.util Package in Java
Java.lang package in Java
Java.io Package in Java
Java Collection Tutorial

Exception Handling in Java

Exceptions in Java
Types of Exception in Java with Examples
Checked vs Unchecked Exceptions in Java
Java Try Catch Block
Flow control in try catch finally in Java
throw and throws in Java
User-defined Custom Exception in Java
Chained Exceptions in Java
Null Pointer Exception In Java
Exception Handling with Method Overriding in Java
Multithreading in Java
Lifecycle and States of a Thread in Java
Java Thread Priority in Multithreading
Main thread in Java
Java.lang.Thread Class in Java
Runnable interface in Java
Naming a thread and fetching name of current thread in Java
What does start() function do in multithreading in Java?
Difference between Thread.start() and Thread.run() in Java
Thread.sleep() Method in Java With Examples
Synchronization in Java
Importance of Thread Synchronization in Java
Method and Block Synchronization in Java
Lock framework vs Thread synchronization in Java
Difference Between Atomic, Volatile and Synchronized in Java
Deadlock in Java Multithreading
Deadlock Prevention And Avoidance
Difference Between Lock and Monitor in Java Concurrency
Reentrant Lock in Java

File Handling in Java

Java.io.File Class in Java
Java Program to Create a New File
Different ways of Reading a text file in Java
Java Program to Write into a File
Delete a File Using Java
File Permissions in Java
FileWriter Class in Java
Java.io.FileDescriptor in Java
Java.io.RandomAccessFile Class Method | Set 1
Regular Expressions in Java
Regex Tutorial - How to write Regular Expressions?
Matcher pattern() method in Java with Examples
Pattern pattern() method in Java with Examples
Quantifiers in Java
java.lang.Character class methods | Set 1
Java IO : Input-output in Java with Examples
Java.io.Reader class in Java
Java.io.Writer Class in Java
Java.io.FileInputStream Class in Java
FileOutputStream in Java
Java.io.BufferedOutputStream class in Java
Java Networking
TCP/IP Model
User Datagram Protocol (UDP)
Differences between IPv4 and IPv6
Difference between Connection-oriented and Connection-less Services
Socket Programming in Java
java.net.ServerSocket Class in Java
URL Class in Java with Examples

JDBC - Java Database Connectivity

Introduction to JDBC (Java Database Connectivity)
JDBC Drivers
Establishing JDBC Connection in Java
Types of Statements in JDBC
JDBC Tutorial
Java 8 Features - Complete Tutorial

Operators constitute the basic building block of any programming language. Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they provide.

Types of Operators:

Arithmetic Operators
Unary Operators
Assignment Operator
Relational Operators
Logical Operators
Ternary Operator
Bitwise Operators
Shift Operators

This article explains all that one needs to know regarding Assignment Operators.

Assignment Operators

These operators are used to assign values to a variable. The left side operand of the assignment operator is a variable, and the right side operand of the assignment operator is a value. The value 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. This means that the assignment operators have right to left associativity, i.e., the value given on the right-hand side of the operator is assigned to the variable on the left. Therefore, the right-hand side value must be declared before using it or should be a constant. The general format of the assignment operator is,

Types of Assignment Operators in Java

The Assignment Operator is generally of two types. They are:

1. Simple Assignment Operator: The Simple Assignment Operator is used with the “=” sign where the left side consists of the operand and the right side consists of a value. The value of the right side must be of the same data type that has been defined on the left side.

2. Compound Assignment Operator: The Compound Operator is used where +,-,*, and / is used along with the = operator.

Let’s look at each of the assignment operators and how they operate:

1. (=) operator:

This is the most straightforward assignment operator, which is used to assign the value on the right to the variable on the left. This is the basic definition of an assignment operator and how it functions.

Syntax:

Example:

2. (+=) operator:

This operator is a compound of ‘+’ and ‘=’ operators. It operates by adding 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.

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 As per the previous example, you might think both of them are equal. But in reality, Method 1 will throw a runtime error stating the “i ncompatible types: possible lossy conversion from double to int “, Method 2 will run without any error and prints 9 as output.

Reason for the Above Calculation

Method 1 will result in a runtime error stating “incompatible types: possible lossy conversion from double to int.” The reason is that the addition of an int and a double results in a double value. Assigning this double value back to the int variable x requires an explicit type casting because it may result in a loss of precision. Without the explicit cast, the compiler throws an error. Method 2 will run without any error and print the value 9 as output. The compound assignment operator += performs an implicit type conversion, also known as an automatic narrowing primitive conversion from double to int . It is equivalent to x = (int) (x + 4.5) , where the result of the addition is explicitly cast to an int . The fractional part of the double value is truncated, and the resulting int value is assigned back to x . It is advisable to use Method 2 ( x += 4.5 ) to avoid runtime errors and to obtain the desired output.

Same automatic narrowing primitive conversion is applicable for other compound assignment operators as well, including -= , *= , /= , and %= .

3. (-=) operator:

This operator is a compound of ‘-‘ and ‘=’ operators. It operates by subtracting the variable’s value on the right from the current value of the variable on the left and then assigning the result to the operand on the left.

4. (*=) operator:

This operator is a compound of ‘*’ 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.

5. (/=) operator:

This operator is a compound of ‘/’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the quotient to the operand on the left.

6. (%=) operator:

This operator is a compound of ‘%’ and ‘=’ operators. It operates by dividing the current value of the variable on the left by the value on the right and then assigning the remainder to the operand on the left.

Please Login to comment...

Improve your Coding Skills with Practice

What kind of Experience do you want to share?

Table of Contents
Course Home
Assignments
Peer Instruction (Instructor)
Peer Instruction (Student)
Change Course
Instructor's Page
Progress Page
Edit Profile
Change Password
Scratch ActiveCode
Scratch Activecode
Instructors Guide
About Runestone
Report A Problem
1.1 Preface
1.2 Why Programming? Why Java?
1.3 Variables and Data Types
1.4 Expressions and Assignment Statements
1.5 Compound Assignment Operators
1.6 Casting and Ranges of Variables
1.7 Java Development Environments (optional)
1.8 Unit 1 Summary
1.9 Unit 1 Mixed Up Code Practice
1.10 Unit 1 Coding Practice
1.11 Multiple Choice Exercises
1.12 Lesson Workspace
1.3. Variables and Data Types" data-toggle="tooltip">
1.5. Compound Assignment Operators' data-toggle="tooltip" >

Before you keep reading...

Runestone Academy can only continue if we get support from individuals like you. As a student you are well aware of the high cost of textbooks. Our mission is to provide great books to you for free, but we ask that you consider a $10 donation, more if you can or less if $10 is a burden.

Making great stuff takes time and $$. If you appreciate the book you are reading now and want to keep quality materials free for other students please consider a donation to Runestone Academy. We ask that you consider a $10 donation, but if you can give more thats great, if $10 is too much for your budget we would be happy with whatever you can afford as a show of support.

1.4. Expressions and Assignment Statements ¶

In this lesson, you will learn about assignment statements and expressions that contain math operators and variables.

1.4.1. Assignment Statements ¶

Remember that a variable holds a value that can change or vary. Assignment statements initialize or change the value stored in a variable using the assignment operator = . An assignment statement always has a single variable on the left hand side of the = sign. The value of the expression on the right hand side of the = sign (which can contain math operators and other variables) is copied into the memory location of the variable on the left hand side.

Figure 1: Assignment Statement (variable = expression) ¶

Instead of saying equals for the = operator in an assignment statement, say “gets” or “is assigned” to remember that the variable on the left hand side gets or is assigned the value on the right. In the figure above, score is assigned the value of 10 times points (which is another variable) plus 5.

The following video by Dr. Colleen Lewis shows how variables can change values in memory using assignment statements.

As we saw in the video, we can set one variable to a copy of the value of another variable like y = x;. This won’t change the value of the variable that you are copying from.

Click on the Show CodeLens button to step through the code and see how the values of the variables change.

The program is supposed to figure out the total money value given the number of dimes, quarters and nickels. There is an error in the calculation of the total. Fix the error to compute the correct amount.

Calculate and print the total pay given the weekly salary and the number of weeks worked. Use string concatenation with the totalPay variable to produce the output Total Pay = $3000 . Don’t hardcode the number 3000 in your print statement.

Assume you have a package with a given height 3 inches and width 5 inches. If the package is rotated 90 degrees, you should swap the values for the height and width. The code below makes an attempt to swap the values stored in two variables h and w, which represent height and width. Variable h should end up with w’s initial value of 5 and w should get h’s initial value of 3. Unfortunately this code has an error and does not work. Use the CodeLens to step through the code to understand why it fails to swap the values in h and w.

1-4-7: Explain in your own words why the ErrorSwap program code does not swap the values stored in h and w.

Swapping two variables requires a third variable. Before assigning h = w , you need to store the original value of h in the temporary variable. In the mixed up programs below, drag the blocks to the right to put them in the right order.

The following has the correct code that uses a third variable named “temp” to swap the values in h and w.

The code is mixed up and contains one extra block which is not needed in a correct solution. Drag the needed blocks from the left into the correct order on the right, then check your solution. You will be told if any of the blocks are in the wrong order or if you need to remove one or more blocks.

After three incorrect attempts you will be able to use the Help Me button to make the problem easier.

Fix the code below to perform a correct swap of h and w. You need to add a new variable named temp to use for the swap.

1.4.2. Incrementing the value of a variable ¶

If you use a variable to keep score you would probably increment it (add one to the current value) whenever score should go up. You can do this by setting the variable to the current value of the variable plus one (score = score + 1) as shown below. The formula looks a little crazy in math class, but it makes sense in coding because the variable on the left is set to the value of the arithmetic expression on the right. So, the score variable is set to the previous value of score + 1.

Click on the Show CodeLens button to step through the code and see how the score value changes.

1-4-11: What is the value of b after the following code executes?

It sets the value for the variable on the left to the value from evaluating the right side. What is 5 * 2?
Correct. 5 * 2 is 10.

1-4-12: What are the values of x, y, and z after the following code executes?

x = 0, y = 1, z = 2
These are the initial values in the variable, but the values are changed.
x = 1, y = 2, z = 3
x changes to y's initial value, y's value is doubled, and z is set to 3
x = 2, y = 2, z = 3
Remember that the equal sign doesn't mean that the two sides are equal. It sets the value for the variable on the left to the value from evaluating the right side.
x = 1, y = 0, z = 3

1.4.3. Operators ¶

Java uses the standard mathematical operators for addition ( + ), subtraction ( - ), multiplication ( * ), and division ( / ). Arithmetic expressions can be of type int or double. An arithmetic operation that uses two int values will evaluate to an int value. An arithmetic operation that uses at least one double value will evaluate to a double value. (You may have noticed that + was also used to put text together in the input program above – more on this when we talk about strings.)

Java uses the operator == to test if the value on the left is equal to the value on the right and != to test if two items are not equal. Don’t get one equal sign = confused with two equal signs == ! They mean different things in Java. One equal sign is used to assign a value to a variable. Two equal signs are used to test a variable to see if it is a certain value and that returns true or false as you’ll see below. Use == and != only with int values and not doubles because double values are an approximation and 3.3333 will not equal 3.3334 even though they are very close.

Run the code below to see all the operators in action. Do all of those operators do what you expected? What about 2 / 3 ? Isn’t surprising that it prints 0 ? See the note below.

When Java sees you doing integer division (or any operation with integers) it assumes you want an integer result so it throws away anything after the decimal point in the answer, essentially rounding down the answer to a whole number. If you need a double answer, you should make at least one of the values in the expression a double like 2.0.

With division, another thing to watch out for is dividing by 0. An attempt to divide an integer by zero will result in an ArithmeticException error message. Try it in one of the active code windows above.

Operators can be used to create compound expressions with more than one operator. You can either use a literal value which is a fixed value like 2, or variables in them. When compound expressions are evaluated, operator precedence rules are used, so that *, /, and % are done before + and -. However, anything in parentheses is done first. It doesn’t hurt to put in extra parentheses if you are unsure as to what will be done first.

In the example below, try to guess what it will print out and then run it to see if you are right. Remember to consider operator precedence .

1-4-15: Consider the following code segment. Be careful about integer division.

What is printed when the code segment is executed?

0.666666666666667
Don't forget that division and multiplication will be done first due to operator precedence.
Yes, this is equivalent to (5 + ((a/b)*c) - 1).
Don't forget that division and multiplication will be done first due to operator precedence, and that an int/int gives an int result where it is rounded down to the nearest int.

1-4-16: Consider the following code segment.

What is the value of the expression?

Dividing an integer by an integer results in an integer
Correct. Dividing an integer by an integer results in an integer
The value 5.5 will be rounded down to 5

1-4-17: Consider the following code segment.

Correct. Dividing a double by an integer results in a double
Dividing a double by an integer results in a double

1-4-18: Consider the following code segment.

Correct. Dividing an integer by an double results in a double
Dividing an integer by an double results in a double

1.4.4. The Modulo Operator ¶

The percent sign operator ( % ) is the mod (modulo) or remainder operator. The mod operator ( x % y ) returns the remainder after you divide x (first number) by y (second number) so 5 % 2 will return 1 since 2 goes into 5 two times with a remainder of 1. Remember long division when you had to specify how many times one number went into another evenly and the remainder? That remainder is what is returned by the modulo operator.

Figure 2: Long division showing the whole number result and the remainder ¶

In the example below, try to guess what it will print out and then run it to see if you are right.

The result of x % y when x is smaller than y is always x . The value y can’t go into x at all (goes in 0 times), since x is smaller than y , so the result is just x . So if you see 2 % 3 the result is 2 .

1-4-21: What is the result of 158 % 10?

This would be the result of 158 divided by 10. modulo gives you the remainder.
modulo gives you the remainder after the division.
When you divide 158 by 10 you get a remainder of 8.

1-4-22: What is the result of 3 % 8?

8 goes into 3 no times so the remainder is 3. The remainder of a smaller number divided by a larger number is always the smaller number!
This would be the remainder if the question was 8 % 3 but here we are asking for the reminder after we divide 3 by 8.
What is the remainder after you divide 3 by 8?

1.4.5. FlowCharting ¶

Assume you have 16 pieces of pizza and 5 people. If everyone gets the same number of slices, how many slices does each person get? Are there any leftover pieces?

In industry, a flowchart is used to describe a process through symbols and text. A flowchart usually does not show variable declarations, but it can show assignment statements (drawn as rectangle) and output statements (drawn as rhomboid).

The flowchart in figure 3 shows a process to compute the fair distribution of pizza slices among a number of people. The process relies on integer division to determine slices per person, and the mod operator to determine remaining slices.

Figure 3: Example Flow Chart ¶

A flowchart shows pseudo-code, which is like Java but not exactly the same. Syntactic details like semi-colons are omitted, and input and output is described in abstract terms.

Complete the program based on the process shown in the Figure 3 flowchart. Note the first line of code declares all 4 variables as type int. Add assignment statements and print statements to compute and print the slices per person and leftover slices. Use System.out.println for output.

1.4.6. Storing User Input in Variables ¶

Variables are a powerful abstraction in programming because the same algorithm can be used with different input values saved in variables.

Figure 4: Program input and output ¶

A Java program can ask the user to type in one or more values. The Java class Scanner is used to read from the keyboard input stream, which is referenced by System.in . Normally the keyboard input is typed into a console window, but since this is running in a browser you will type in a small textbox window displayed below the code. The code below shows an example of prompting the user to enter a name and then printing a greeting. The code String name = scan.nextLine() gets the string value you enter as program input and then stores the value in a variable.

Run the program a few times, typing in a different name. The code works for any name: behold, the power of variables!

Run this program to read in a name from the input stream. You can type a different name in the input window shown below the code.

Try stepping through the code with the CodeLens tool to see how the name variable is assigned to the value read by the scanner. You will have to click “Hide CodeLens” and then “Show in CodeLens” to enter a different name for input.

The Scanner class has several useful methods for reading user input. A token is a sequence of characters separated by white space.

Run this program to read in an integer from the input stream. You can type a different integer value in the input window shown below the code.

A rhomboid (slanted rectangle) is used in a flowchart to depict data flowing into and out of a program. The previous flowchart in Figure 3 used a rhomboid to indicate program output. A rhomboid is also used to denote reading a value from the input stream.

Figure 5: Flow Chart Reading User Input ¶

Figure 5 contains an updated version of the pizza calculator process. The first two steps have been altered to initialize the pizzaSlices and numPeople variables by reading two values from the input stream. In Java this will be done using a Scanner object and reading from System.in.

Complete the program based on the process shown in the Figure 5 flowchart. The program should scan two integer values to initialize pizzaSlices and numPeople. Run the program a few times to experiment with different values for input. What happens if you enter 0 for the number of people? The program will bomb due to division by zero! We will see how to prevent this in a later lesson.

The program below reads two integer values from the input stream and attempts to print the sum. Unfortunately there is a problem with the last line of code that prints the sum.

Run the program and look at the result. When the input is 5 and 7 , the output is Sum is 57 . Both of the + operators in the print statement are performing string concatenation. While the first + operator should perform string concatenation, the second + operator should perform addition. You can force the second + operator to perform addition by putting the arithmetic expression in parentheses ( num1 + num2 ) .

More information on using the Scanner class can be found here https://www.w3schools.com/java/java_user_input.asp

1.4.7. Programming Challenge : Dog Years ¶

In this programming challenge, you will calculate your age, and your pet’s age from your birthdates, and your pet’s age in dog years. In the code below, type in the current year, the year you were born, the year your dog or cat was born (if you don’t have one, make one up!) in the variables below. Then write formulas in assignment statements to calculate how old you are, how old your dog or cat is, and how old they are in dog years which is 7 times a human year. Finally, print it all out.

Calculate your age and your pet’s age from the birthdates, and then your pet’s age in dog years. If you want an extra challenge, try reading the values using a Scanner.

1.4.8. Summary ¶

Arithmetic expressions include expressions of type int and double.

The arithmetic operators consist of +, -, * , /, and % (modulo for the remainder in division).

An arithmetic operation that uses two int values will evaluate to an int value. With integer division, any decimal part in the result will be thrown away, essentially rounding down the answer to a whole number.

An arithmetic operation that uses at least one double value will evaluate to a double value.

Operators can be used to construct compound expressions.

During evaluation, operands are associated with operators according to operator precedence to determine how they are grouped. (*, /, % have precedence over + and -, unless parentheses are used to group those.)

An attempt to divide an integer by zero will result in an ArithmeticException to occur.

The assignment operator (=) allows a program to initialize or change the value stored in a variable. The value of the expression on the right is stored in the variable on the left.

During execution, expressions are evaluated to produce a single value.

The value of an expression has a type based on the evaluation of the expression.

clear sunny desert yellow sand with celestial snow bridge

1.7 Java | Assignment Statements & Expressions

An assignment statement designates a value for a variable. An assignment statement can be used as an expression in Java.

After a variable is declared, you can assign a value to it by using an assignment statement . In Java, the equal sign = is used as the assignment operator . The syntax for assignment statements is as follows:

An expression represents a computation involving values, variables, and operators that, when taking them together, evaluates to a value. For example, consider the following code:

You can use a variable in an expression. A variable can also be used on both sides of the = operator. For example:

In the above assignment statement, the result of x + 1 is assigned to the variable x . Let’s say that x is 1 before the statement is executed, and so becomes 2 after the statement execution.

To assign a value to a variable, you must place the variable name to the left of the assignment operator. Thus the following statement is wrong:

Note that the math equation x = 2 * x + 1 ≠ the Java expression x = 2 * x + 1

Java Assignment Statement vs Assignment Expression

Which is equivalent to:

And this statement

is equivalent to:

Note: The data type of a variable on the left must be compatible with the data type of a value on the right. For example, int x = 1.0 would be illegal, because the data type of x is int (integer) and does not accept the double value 1.0 without Type Casting .

◄◄◄BACK | NEXT►►►

What's Your Opinion? Cancel reply

Enhance your Brain

Subscribe to Receive Free Bio Hacking, Nootropic, and Health Information

HTML for Simple Website Customization My Personal Web Customization Personal Insights

DISCLAIMER | Sitemap | ◘

HTML for Simple Website Customization My Personal Web Customization Personal Insights SEO Checklist Publishing Checklist My Tools

01 Career Opportunities

Top 50 Java Interview Questions and Answers
Java Developer Salary Guide in India – For Freshers & Experienced

02 Beginner

Best Java Developer Roadmap 2024
Hierarchical Inheritance in Java
Arithmetic operators in Java
Unary operator in Java
Ternary Operator in Java
Relational operators in Java

Assignment operator in Java

Logical operators in Java
Single Inheritance in Java
Primitive Data Types in Java
Multiple Inheritance in Java
Hybrid Inheritance in Java
Parameterized Constructor in Java
Constructor Chaining in Java
Constructor Overloading in Java
What are Copy Constructors In Java? Explore Types,Examples & Use
What is a Bitwise Operator in Java? Type, Example and More
Top 10 Reasons to know why Java is Important?
What is Java? A Beginners Guide to Java
Differences between JDK, JRE, and JVM: Java Toolkit
Variables in Java: Local, Instance and Static Variables
Data Types in Java - Primitive and Non-Primitive Data Types
Conditional Statements in Java: If, If-Else and Switch Statement
What are Operators in Java - Types of Operators in Java ( With Examples )
Looping Statements in Java - For, While, Do-While Loop in Java
Java VS Python
Jump Statements in JAVA - Types of Statements in JAVA (With Examples)
Java Arrays: Single Dimensional and Multi-Dimensional Arrays
What is String in Java - Java String Types and Methods (With Examples)

03 Intermediate

OOPs Concepts in Java: Encapsulation, Abstraction, Inheritance, Polymorphism
Access Modifiers in Java: Default, Private, Public, Protected
What is Class in Java? - Objects and Classes in Java {Explained}
Constructors in Java: Types of Constructors with Examples
Polymorphism in Java: Compile time and Runtime Polymorphism
Abstraction in Java: Concepts, Examples, and Usage
What is Inheritance in Java: Types of Inheritance in Java
Exception handling in Java: Try, Catch, Finally, Throw and Throws

04 Training Programs

Java Programming Course
C++ Programming Course
MERN: Full-Stack Web Developer Certification Training
Data Structures and Algorithms Training
Assignment Operator In Ja..

Java Programming For Beginners Free Course

Assignment operators in java: an overview.

We already discussed the Types of Operators in the previous tutorial Java. In this Java tutorial , we will delve into the different types of assignment operators in Java, and their syntax, and provide examples for better understanding. Because Java is a flexible and widely used programming language. Assignment operators play a crucial role in manipulating and assigning values to variables. To further enhance your understanding and application of Java assignment operator's concepts, consider enrolling in the best Java Certification Course .

What are the Assignment Operators in Java?

Assignment operators in Java are used to assign values to variables . They are classified into two main types: simple assignment operator and compound assignment operator.

The general syntax for a simple assignment statement is:

And for a compound assignment statement:

Read More - Advanced Java Interview Questions

Types of Assignment Operators in Java

Simple Assignment Operator: The Simple Assignment Operator is used with the "=" sign, where the operand is on the left side and the value is on the right. The right-side value must be of the same data type as that defined on the left side.
Compound Assignment Operator: Compound assignment operators combine arithmetic operations with assignments. They provide a concise way to perform an operation and assign the result to the variable in one step. The Compound Operator is utilized when +,-,*, and / are used in conjunction with the = operator.

1. Simple Assignment Operator (=):

The equal sign (=) is the basic assignment operator in Java. It is used to assign the value on the right-hand side to the variable on the left-hand side.

Explanation

2. addition assignment operator (+=) :, 3. subtraction operator (-=):, 4. multiplication operator (*=):.

5. Division Operator (/=):

6. modulus assignment operator (%=):, example of assignment operator in java.

Let's look at a few examples in our Java Playground to illustrate the usage of assignment operators in Java:

Unary Operator in Java
Arithmetic Operators in Java
Relational Operators in Java
Logical Operators 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.

1. (=) operator
1. (+=) operator
2. (-=) operator
3. (*=) operator
4. (/=) operator
5. (%=) operator

About Author

We use cookies to make interactions with our websites and services easy and meaningful. Please read our Privacy Policy for more details.

Java Assignment Operators

Java programming tutorial index.

The Java Assignment Operators are used when you want to assign a value to the expression. The assignment operator denoted by the single equal sign = .

In a Java assignment statement, any expression can be on the right side and the left side must be a variable name. For example, this does not mean that "a" is equal to "b", instead, it means assigning the value of 'b' to 'a'. It is as follows:

Java also has the facility of chain assignment operators, where we can specify a single value for multiple variables.

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.

Expressions, Statements, and Blocks

Now that you understand variables and operators, it's time to learn about expressions , statements , and blocks . Operators may be used in building expressions, which compute values; expressions are the core components of statements; statements may be grouped into blocks.

Expressions

An expression is a construct made up of variables, operators, and method invocations, which are constructed according to the syntax of the language, that evaluates to a single value. You've already seen examples of expressions, illustrated in bold below:

The data type of the value returned by an expression depends on the elements used in the expression. The expression cadence = 0 returns an int because the assignment operator returns a value of the same data type as its left-hand operand; in this case, cadence is an int . As you can see from the other expressions, an expression can return other types of values as well, such as boolean or String .

The Java programming language allows you to construct compound expressions from various smaller expressions as long as the data type required by one part of the expression matches the data type of the other. Here's an example of a compound expression:

In this particular example, the order in which the expression is evaluated is unimportant because the result of multiplication is independent of order; the outcome is always the same, no matter in which order you apply the multiplications. However, this is not true of all expressions. For example, the following expression gives different results, depending on whether you perform the addition or the division operation first:

You can specify exactly how an expression will be evaluated using balanced parenthesis: ( and ). For example, to make the previous expression unambiguous, you could write the following:

If you don't explicitly indicate the order for the operations to be performed, the order is determined by the precedence assigned to the operators in use within the expression. Operators that have a higher precedence get evaluated first. For example, the division operator has a higher precedence than does the addition operator. Therefore, the following two statements are equivalent:

When writing compound expressions, be explicit and indicate with parentheses which operators should be evaluated first. This practice makes code easier to read and to maintain.

Statements are roughly equivalent to sentences in natural languages. A statement forms a complete unit of execution. The following types of expressions can be made into a statement by terminating the expression with a semicolon ( ; ).

Assignment expressions
Any use of ++ or --
Method invocations
Object creation expressions

Such statements are called expression statements . Here are some examples of expression statements.

In addition to expression statements, there are two other kinds of statements: declaration statements and control flow statements . A declaration statement declares a variable. You've seen many examples of declaration statements already:

Finally, control flow statements regulate the order in which statements get executed. You'll learn about control flow statements in the next section, Control Flow Statements

A block is a group of zero or more statements between balanced braces and can be used anywhere a single statement is allowed. The following example, BlockDemo , illustrates the use of blocks:

About Oracle | Contact Us | Legal Notices | Terms of Use | Your Privacy Rights

What Is an Assignment Statement in Java?

Java programs store data values in variables. When a programmer creates a variable in a Java application, he declares the type and name of the variable, then assigns a value to it. The value of a variable can be altered at subsequent points in execution using further assignment operations. The assignment statement in Java involves using the assignment operator to set the value of a variable. The exact syntax depends on the type of variable receiving a value.

Video of the Day

In Java, variables are strongly typed. This means that when you declare a variable in a Java program, you must declare its type, followed by its name. The following sample Java code demonstrates declaring two variables, one of primitive-type integer and one of an object type for a class within the application: int num; ApplicationHelper myHelp;

Once a program contains a variable declaration, the kind of value assigned to the variable must be suited to the type declared. These variable declarations could be followed by assignment statements on subsequent lines. However, the assignment operation could also take place on the same line as the declaration.

Assignment in Java is the process of giving a value to a primitive-type variable or giving an object reference to an object-type variable. The equals sign acts as assignment operator in Java, followed by the value to assign. The following sample Java code demonstrates assigning a value to a primitive-type integer variable, which has already been declared: num = 5;

The assignment operation could alternatively appear within the same line of code as the declaration of the variable, as follows: int num = 5;

The value of the variable can be altered again in subsequent processing as in this example: num++;

This code increments the variable value, adding a value of one to it.

Instantiation

When the assignment statement appears with object references, the assignment operation may also involve object instantiation. When Java code creates a new object instance of a Java class in an application, the "new" keyword causes the constructor method of the class to execute, instantiating the object. The following sample code demonstrates instantiating an object variable: myHelp = new ApplicationHelper();

This could also appear within the same line as the variable declaration as follows: ApplicationHelper myHelp = new ApplicationHelper();

When this line of code executes, the class constructor method executes, returning an instance of the class, a reference to which is stored by the variable.

Referencing

Once a variable has been declared and assigned a value, a Java program can refer to the variable in subsequent processing. For primitive-type variables, the variable name refers to a stored value. For object types, the variable refers to the location of the object instance in memory. This means that two object variables can point to the same instance, as in the following sample code: ApplicationHelper myHelp = new ApplicationHelper(); ApplicationHelper sameHelp = myHelp;

This syntax appears commonly when programs pass object references as parameters to class methods.

Oracle: The Java Tutorials - Variables
Oracle: The Java Tutorials - Assignment, Arithmetic, and Unary Operators
Oracle: The Java Tutorials - Primitive Data Types
Oracle: The Java Tutorials - Creating Objects
Oracle: The Java Tutorials - What Is an Object?
Oracle: The Java Tutorials - Summary of Variables
Java Language Specification; Types, Values, and Variables; 2000
Oracle: The Java Tutorials - Understanding Instance and Class Members

Report an Issue

Screenshot loading...

Basics of Java
➤ Java Introduction
➤ History of Java
➤ Getting started with Java
➤ What is Path and Classpath
➤ Checking Java installation and Version
➤ Syntax in Java
➤ My First Java Program
➤ Basic terms in Java Program
➤ Runtime and Compile time
➤ What is Bytecode
➤ Features of Java
➤ What is JDK JRE and JVM
➤ Basic Program Examples
Variables and Data Types
➤ What is Variable
➤ Types of Java Variables
➤ Naming conventions for Identifiers
➤ Data Type in Java
➤ Mathematical operators in Java
➤ Assignment operator in Java
➤ Arithmetic operators in Java
➤ Unary operators in Java
➤ Conditional and Relational Operators
➤ Bitwise and Bit Shift Operators
➤ Operator Precedence
➤ Overflow Underflow Widening Narrowing
➤ Variable and Data Type Programs
Control flow Statements
➤ Java if and if else Statement
➤ else if and nested if else Statement
➤ Java for Loop
➤ Java while and do-while Loop
➤ Nested loops
➤ Java break Statement
➤ Java continue and return Statement
➤ Java switch Statement
➤ Control Flow Program Examples
Array and String in Java
➤ Array in Java
➤ Multi-Dimensional Arrays
➤ for-each loop in java
➤ Java String
➤ Useful Methods of String Class
➤ StringBuffer and StringBuilder
➤ Array and String Program Examples
Classes and Objects
➤ Classes in Java
➤ Objects in Java
➤ Methods in Java
➤ Constructors in Java
➤ static keyword in Java
➤ Call By Value
➤ Inner/nested classes in Java
➤ Wrapper Classes
➤ Enum in Java
➤ Initializer blocks
➤ Method Chaining and Recursion
Packages and Interfaces
➤ What is package
➤ Sub packages in java
➤ built-in packages in java
➤ Import packages
➤ Access modifiers
➤ Interfaces in Java
➤ Key points about Interfaces
➤ New features in Interfaces
➤ Nested Interfaces
➤ Structure of Java Program
OOPS Concepts
➤ What is OOPS
➤ Inheritance in Java
➤ Inheritance types in Java
➤ Abstraction in Java
➤ Encapsulation in Java
➤ Polymorphism in Java
➤ Runtime and Compile-time Polymorphism
➤ Method Overloading
➤ Method Overriding
➤ Overloading and Overriding Differences
➤ Overriding using Covariant Return Type
➤ this keyword in Java
➤ super keyword in Java
➤ final keyword in Java

Assignment Operator in Java with Example

Assignment operator is one of the simplest and most used operator in java programming language. As the name itself suggests, the assignment operator is used to assign value inside a variable. In java we can divide assignment operator in two types :

Assignment operator or simple assignment operator
Compound assignment operators

What is assignment operator in java

The = operator in java is known as assignment or simple assignment operator. It assigns the value on its right side to the operand(variable) on its left side. For example :

The left-hand side of an assignment operator must be a variable while the right side of it should be a value which can be in the form of a constant value, a variable name, an expression, a method call returning a compatible value or a combination of these.

The value at right side of assignment operator must be compatible with the data type of left side variable, otherwise compiler will throw compilation error. Following are incorrect assignment :

Another important thing about assignment operator is that, it is evaluated from right to left . If there is an expression at right side of assignment operator, it is evaluated first then the resulted value is assigned in left side variable.

Here in statement int x = a + b + c; the expression a + b + c is evaluated first, then the resulted value( 60 ) is assigned into x . Similarly in statement a = b = c , first the value of c which is 30 is assigned into b and then the value of b which is now 30 is assigned into a .

The variable at left side of an assignment operator can also be a non-primitive variable. For example if we have a class MyFirstProgram , we can assign object of MyFirstProgram class using = operator in MyFirstProgram type variable.

Is == an assignment operator ?

No , it's not an assignment operator, it's a relational operator used to compare two values.

Is assignment operator a binary operator

Yes , as it requires two operands.

Assignment operator program in Java

a = 2 b = 2 c = 4 d = 4 e = false

Java compound assignment operators

The assignment operator can be mixed or compound with other operators like addition, subtraction, multiplication etc. We call such assignment operators as compound assignment operator. For example :

Here the statement a += 10; is the short version of a = a + 10; the operator += is basically addition compound assignment operator. Similarly b *= 5; is short version of b = b * 5; the operator *= is multiplication compound assignment operator. The compound assignment can be in more complex form as well, like below :

List of all assignment operators in Java

The table below shows the list of all possible assignment(simple and compound) operators in java. Consider a is an integer variable for this table.

How many assignment operators are there in Java ?

Including simple and compound assignment we have total 12 assignment operators in java as given in above table.

What is shorthand operator in Java ?

Shorthand operators are nothing new they are just a shorter way to write something that is already available in java language. For example the code a += 5 is shorter way to write a = a + 5 , so += is a shorthand operator. In java all the compound assignment operator(given above) and the increment/decrement operators are basically shorthand operators.

Compound assignment operator program in Java

a = 20 b = 80 c = 30 s = 64 s2 = 110 b2 = 15

What is the difference between += and =+ in Java?

An expression a += 1 will result as a = a + 1 while the expression a =+ 1 will result as a = +1 . The correct compound statement is += , not =+ , so do not use the later one.

Java Tutorial

Control statements, java object class, java inheritance, java polymorphism, java abstraction, java encapsulation, java oops misc.

Send your Feedback to [email protected]

Help Others, Please Share

Learn Latest Tutorials

Transact-SQL

Reinforcement Learning

R Programming

React Native

Python Design Patterns

Python Pillow

Python Turtle

Preparation

Verbal Ability

Interview Questions

Company Questions

Trending Technologies

Artificial Intelligence

Cloud Computing

Data Science

Machine Learning

B.Tech / MCA

Data Structures

Operating System

Computer Network

Compiler Design

Computer Organization

Discrete Mathematics

Ethical Hacking

Computer Graphics

Software Engineering

Web Technology

Cyber Security

C Programming

Control System

Data Mining

Data Warehouse

Java Program To
Check Array Bounds
Integer X appears more than N/2 times
Transpose of A Matrix
Create a Jagged Array
Print the kth Element
Find Even and Odd Numbers in Array
Find the ceil
Print All the Repeated Numbers
Find Array Size
Find the Frequency of Odd and Even
interchange Rows and Columns
Add Two M*N Matrix
Matrix Multiplication
Reverse a Linked List
Reverse A List
Find Element in List
Sort an Array in Alphabetical Order
Find the Largest Element in an Array
Put Even and Odd Elements in Two Separate Arrays
Insert an Element at Specified Position
Delete the Specified Integer From an Array
Sort an Array in Ascending Order
Sort an Array in Descending Order
Find the Sum and Average of an Array
Find the Largest Two Numbers
Cyclically Permute the Elements of an Array
Increment Every Element of Array
Split an Array from Specified Position
Identify the Missing Number in Array
Find Largest Difference in Array
Count the Number of Occurrence of an Element
Accept Array Elements and Calculate the Sum
For Loop Program
Find nth Node Linked List
Java Program to
Find Factorial
Swap Two Numbers
Print ASCII Values
Armstrong Number
Perfect Number
Conditional Operator
Assignment Operations
Find Even or Odd
Is String Empty
Factorial of A Number
Display Upper Triangle Matrix
Find Sparse Matrix
Interchange Matrix Diagonals
Trace and Normal of a Matrix
Find Simple Interest
Separate 0s and 1s in Array
Integer To Binary
Gray Code Without Using Recursion
Sum of Digits
Area of Square
Area of a Trapezium
Find Perimeter of Circle
Find Product of Two Numbers
Find Surface Area of Cuboid
Find Surface Area of Sphere
Print Table in Triangular Form
Number to equivalent Gray’s Code
Sum of N Numbers
Find Area of the Rhombus
Area of Circle
Rhombus Star Pattern
Mirrored Rhombus Star Pattern
Rhombus star pattern
Print 8 Star Pattern
Print Inverted Star Pattern
Right Triangle Star Pattern
Hollow diamond star pattern
Detect a Loop In List
Half Diamond Star Pattern
Hollow Pyramid Star Pattern
Relational Operators
Print Fibonacci Series
While Loop Program
Check Whether a Number is Positive or Negative
Check Whether a Character is Alphabet or Not
Get Sum Of Natural Numbers
Find Percentage and Total Marks
If Else Program
Java Nested If
Find Max-Min Char Occurring
Print Compound Interest
Find All Roots of a Quadratic Equation
Find parallelogram
Bitwise Operations
Do While Program
For Each Loop Program
Break Statement Program
Continue Statement Program
Palindrome Number
Prime Number
GCD of two numbers
LCM of Two Numbers
Generate Pascal Triangle
Print Hollow Diamond Pattern
Print Star Pattern
Mirrored Right Triangle Pattern
Left Arrow Star Pattern
Inverted Right Triangle
Inverted Pyramid Star Pattern
Right Arrow Star Pattern
Square Star Pattern
Inverted Mirrored Right Triangle
Print X Star Pattern
Find Duplicate Char in String
Replace Spaces of String
Divide String N Equal Parts
Find Subsets of a String
Check Palindrome String
Compare Two Strings
Reverse String
Count Characters in String
Find Vowels and Consonants
Remove WhiteSpace
Count Frequency of Char

Java Program to Perform Assignment Operations

In this tutorial, we will learn how to perform assignment operations by taking input from the user. But before moving further, if you are not familiar with the concept of the assignment operator in java, then do check the article on Operators in Java .

Input: num1=10

Value of num1=30

Value of num1=10

Two cases arise for the above problem:

Case 1: When values are pre-defined

Case 2: When values are user-defined

Let us look at each of these cases separately.

Program 1: To Perform the Assignment Operations

In this program, we will perform the assignment operations when the values are pre-defined in the program.

Here, we will use a switch case to choose from different assignment operators like +=, -=, *=, /=, and %=.
Declare two variables.
Initialize it.
Perform all the assignment operators like +=, -=, *=, /=, and %=.
Display the result of each assignment operation.

Below is the code for the same.

Initial value of num1 = 10 Initial value of num2 = 20 Value of num1 after += is 30 Value of num1 after -= is 10 Value of num1 after *= is 200 Value of num1 after /= is 10 Value of num1 after %= is 0

Program 2: To Perform the Assignment Operations

In this program, we will see how to perform assignment operations in java when the values are user-defined. Here, firstly we will ask the user to input the values, and then we will perform the assignment operations

Declare a variable for the same.
Ask the user to initialize it.
Based on the operation chosen, declare two variables.
Ask the user to initialize the variables.
Display the result after performing the assignment operations.

Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 1 Enter the two numbers to perform operations Enter the first number: Enter the second number: The initial value of x is 5 Value of x after += is 9 Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 2 Enter the two numbers to perform operations Enter the first number: Enter the second number: The initial value of p is 4 Value of p after -= is 1 Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 3 Enter the two numbers to perform operations Enter the first number: Enter the second number: The initial value of a is 4 The value of a after *= is 20 Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 4 Enter the two numbers to perform operations Enter the first number : Enter the second number : The initial value of c is 8 Value of c after /= is 1 Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 5 Enter the two numbers to perform operations Enter the first number : Enter the second number : The initial value of e is 7 Value of e after %= is 1 Choose the operation you want to perform Choose 1 for += Choose 2 for -= Choose 3 for *= Choose 4 for /= Choose 5 for %= Choose 6 for EXIT 6

← Conditional Operator ← PREV
Java Program to → NEXT →

Assignment Operator in Java | Example Program

An operator which is used to store a value into a particular variable is called assignment operator in Java . In any programming language, an assignment operator is the most commonly used to assign a value to a variable.

There are three categories of assignment operations in Java programming. They are as follows:

Simple assignment
Compound assignment
Assignment as expression

Simple Assignment

We can use a simple assignment in two ways:

To store or assign a value to a variable.
To store a value of a variable into another variable.

It has the following general format to represent a simple assignment.

v: It is a variable name that represents a memory location where a value may be stored.
expression: It may be a constant, variable, or a combination of constants, variables, and operators.
= is an assignment operator.

For example:

Compound Assignment

The general form of compound assignment is as follows:

op: It is a Java binary operator. It may be + – * / % << >> etc. v and expression are the same as explained in the simple assignment.
The operator op = is known as a shorthand assignment operator in Java because
v op = expression is shorthand notation for v = v operator expression.

1. x += 5; // It is equivalent to int x = x + 5; 2. x -= 10; // It is equivalent to int x = x – 10; 3. a *= 100; // Equivalent to int a = a * 100; 4. a /= (b + c);

Let’s take an example program based on compound assignment operator.

Program code 1:

Explanation:

3. z *= x * y; is equivalent to z = z * (x * y); z = z * (50 * (-70)); z = 50 * (-3500); z = -175000;

Assignment as Expression

In Java, we can also consider an assignment operation an expression because the operation has a result. The result of expression is a value that is stored in a variable. We mainly use it in more than one assignment.

1. int x = y – z + 4; // Here, the expression y – z + 4 is evaluated first and then its result is stored into the variable x.

Let’s take an example program where we will use an assignment as an expression.

Program code 3:

Explanation:

The following steps have been performed to evaluate the above expressions of the program. 1. a += 1; a = a + 1; a = 19 + 1; a = 20;

2. b -= 1; b = b – 1; b = 31 – 1; b = 30;

3. c *= 2; c = c * 2; c = 50 * 2; c = 100;

4. x = (10 + a); x = 10 + 20; // Here, the value of x will be 20, not 19. x = 30;

5. y = x + 100; y = 30 + 100; // Here, the value of x will be 30. y = 130;

6. z = x + y + c; z = 30 + 130 +100; // Here, the value of c will be 100. z = 260;

1. You cannot use more than one variable on the left-hand side of = operator.

x + y = 20; // It is invalid because there will be doubt to Java compiler regarding for storing the value 20.

2. You cannot use a literal or constant value on the left-hand side of = operator.

20 = a; // It is also invalid because how can we store value of x in a number.

Hope that this tutorial has covered all important points related to assignment operator in Java with example programs. I hope that you will have understood this topic clearly and enjoyed it. In the next, we will understand various types of unary operators in Java. Thanks for reading!!!

⇐ Prev Next ⇒

Learn Java practically and Get Certified .

Java Flow Control

Java if...else

Java switch Statement

Java for Loop
Java for-each Loop
Java while Loop

Java break Statement

Java continue Statement
Java Arrays
Multidimensional Array
Java Copy Array

Java OOP (I)

Java Class and Objects
Java Methods
Java Method Overloading
Java Constructor
Java Strings
Java Access Modifiers
Java this keyword
Java final keyword
Java Recursion
Java instanceof Operator

Java OOP (II)

Java Inheritance
Java Method Overriding
Java super Keyword
Abstract Class & Method
Java Interfaces
Java Polymorphism
Java Encapsulation

Java OOP (III)

Nested & Inner Class
Java Static Class
Java Anonymous Class
Java Singleton
Java enum Class
Java enum Constructor
Java enum String
Java Reflection
Java Exception Handling
Java Exceptions
Java try...catch
Java throw and throws
Java catch Multiple Exceptions
Java try-with-resources
Java Annotations
Java Annotation Types
Java Logging
Java Assertions
Java Collections Framework
Java Collection Interface
Java List Interface
Java ArrayList
Java Vector
Java Queue Interface
Java PriorityQueue
Java Deque Interface
Java LinkedList
Java ArrayDeque
Java BlockingQueue Interface
Java ArrayBlockingQueue
Java LinkedBlockingQueue
Java Map Interface
Java HashMap
Java LinkedHashMap
Java WeakHashMap
Java EnumMap
Java SortedMap Interface
Java NavigableMap Interface
Java TreeMap
Java ConcurrentMap Interface
Java ConcurrentHashMap
Java Set Interface
Java HashSet
Java EnumSet
Java LinkedhashSet
Java SortedSet Interface
Java NavigableSet Interface
Java TreeSet
Java Algorithms
Java Iterator
Java ListIterator
Java I/O Streams
Java InputStream
Java OutputStream
Java FileInputStream
Java FileOutputStream
Java ByteArrayInputStream
Java ByteArrayOutputStream
Java ObjectInputStream
Java ObjectOutputStream
Java BufferedInputStream
Java BufferedOutputStream
Java PrintStream

Java Reader/Writer

Java Reader
Java Writer
Java InputStreamReader
Java OutputStreamWriter
Java FileReader
Java FileWriter
Java BufferedReader
Java BufferedWriter
Java StringReader
Java StringWriter
Java PrintWriter

Additional Topics

Java Scanner Class
Java Type Casting
Java autoboxing and unboxing
Java Lambda Expression
Java Generics
Java File Class
Java Wrapper Class
Java Command Line Arguments

Java Tutorials

Java Ternary Operator

Java Expressions, Statements and Blocks

Java if...else Statement

In programming, we use the if..else statement to run a block of code among more than one alternatives.

For example, assigning grades (A, B, C) based on the percentage obtained by a student.

if the percentage is above 90 , assign grade A
if the percentage is above 75 , assign grade B
if the percentage is above 65 , assign grade C

1. Java if (if-then) Statement

The syntax of an if-then statement is:

Here, condition is a boolean expression such as age >= 18 .

if condition evaluates to true , statements are executed
if condition evaluates to false , statements are skipped

Working of if Statement

if the number is greater than 0, code inside if block is executed, otherwise code inside if block is skipped

Example 1: Java if Statement

In the program, number < 0 is false . Hence, the code inside the body of the if statement is skipped .

Note: If you want to learn more about about test conditions, visit Java Relational Operators and Java Logical Operators .

We can also use Java Strings as the test condition.

Example 2: Java if with String

In the above example, we are comparing two strings in the if block.

2. Java if...else (if-then-else) Statement

The if statement executes a certain section of code if the test expression is evaluated to true . However, if the test expression is evaluated to false , it does nothing.

In this case, we can use an optional else block. Statements inside the body of else block are executed if the test expression is evaluated to false . This is known as the if-...else statement in Java.

The syntax of the if...else statement is:

Here, the program will do one task (codes inside if block) if the condition is true and another task (codes inside else block) if the condition is false .

How the if...else statement works?

If the condition is true, the code inside the if block is executed, otherwise, code inside the else block is executed

Example 3: Java if...else Statement

In the above example, we have a variable named number . Here, the test expression number > 0 checks if number is greater than 0.

Since the value of the number is 10 , the test expression evaluates to true . Hence code inside the body of if is executed.

Now, change the value of the number to a negative integer. Let's say -5 .

If we run the program with the new value of number , the output will be:

Here, the value of number is -5 . So the test expression evaluates to false . Hence code inside the body of else is executed.

3. Java if...else...if Statement

In Java, we have an if...else...if ladder, that can be used to execute one block of code among multiple other blocks.

Here, if statements are executed from the top towards the bottom. When the test condition is true , codes inside the body of that if block is executed. And, program control jumps outside the if...else...if ladder.

If all test expressions are false , codes inside the body of else are executed.

How the if...else...if ladder works?

If the first test condition if true, code inside first if block is executed, if the second condition is true, block inside second if is executed, and if all conditions are false, the else block is executed

Example 4: Java if...else...if Statement

In the above example, we are checking whether number is positive, negative, or zero . Here, we have two condition expressions:

number > 0 - checks if number is greater than 0
number < 0 - checks if number is less than 0

Here, the value of number is 0 . So both the conditions evaluate to false . Hence the statement inside the body of else is executed.

Note : Java provides a special operator called ternary operator , which is a kind of shorthand notation of if...else...if statement. To learn about the ternary operator, visit Java Ternary Operator .

4. Java Nested if..else Statement

In Java, it is also possible to use if..else statements inside an if...else statement. It's called the nested if...else statement.

Here's a program to find the largest of 3 numbers using the nested if...else statement.

Example 5: Nested if...else Statement

In the above programs, we have assigned the value of variables ourselves to make this easier.

However, in real-world applications, these values may come from user input data, log files, form submission, etc.

Introduction
Java if (if-then) Statement
Example: Java if Statement
Java if...else (if-then-else) Statement
Example: Java if else Statement
Java if..else..if Statement
Example: Java if..else..if Statement
Java Nested if..else Statement

Sorry about that.

assignment statement java program

IMAGES

VIDEO

COMMENTS

Overview of Java

Basics of Java

Operators in Java

Wrapper Classes in Java

Flow Control in Java

Java Assignment Operators with Examples

OOPS in Java

Access Modifiers in Java

Inheritance in Java

Constructors in Java

Methods in Java

Keywords in Java

Memory Allocation in Java

Classes of Java

Packages in Java

Exception Handling in Java

File Handling in Java

JDBC - Java Database Connectivity

Assignment Operators

Types of Assignment Operators in Java

1. (=) operator:

2. (+=) operator:

Reason for the Above Calculation

3. (-=) operator:

4. (*=) operator:

5. (/=) operator:

6. (%=) operator:

Please Login to comment...

Improve your Coding Skills with Practice

What kind of Experience do you want to share?

Before you keep reading...

1.4. Expressions and Assignment Statements ¶

1.4.1. Assignment Statements ¶

1.4.2. Incrementing the value of a variable ¶

1.4.3. Operators ¶

1.4.4. The Modulo Operator ¶

1.4.5. FlowCharting ¶

1.4.6. Storing User Input in Variables ¶

1.4.7. Programming Challenge : Dog Years ¶

1.4.8. Summary ¶

1.7 Java | Assignment Statements & Expressions

What's Your Opinion? Cancel reply

Top Posts & Pages

01 Career Opportunities

02 Beginner

Assignment operator in Java

03 Intermediate

04 Training Programs

Java Programming For Beginners Free Course

What are the Assignment Operators in Java?

Types of Assignment Operators in Java

1. Simple Assignment Operator (=):

Explanation

5. Division Operator (/=):

Q1. Can I use multiple assignment operators in a single statement?

About Author

Java Assignment Operators

Expressions, Statements, and Blocks

Expressions

What Is an Assignment Statement in Java?

Instantiation

Referencing

Report an Issue

Assignment Operator in Java with Example

What is assignment operator in java

Is == an assignment operator ?

Is assignment operator a binary operator

Assignment operator program in Java

Java compound assignment operators

List of all assignment operators in Java

How many assignment operators are there in Java ?

What is shorthand operator in Java ?

Compound assignment operator program in Java

What is the difference between += and =+ in Java?

Java Tutorial

Help Others, Please Share

Learn Latest Tutorials

Preparation

Trending Technologies

B.Tech / MCA