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 in a variable.

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

1. Simple assignment

2. Compound assignment.

3. Assignment as expression.

A simple assignment can be used in two ways:

1. To store or assign a value into a variable.

2. To store a value of a variable into another variable.

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

v = expression;

where,

v: It is a variable name which represents 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:

1. int x = 10;

2. int y = x; // Here, the value of variable x is stored into y.

The general form of compound assignment is as follows:

v op = expression;

where,

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 because

v op = expression is shorthand notation for v = v operator expression.

For example:

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 to understand the concept better.

1. x +=y; will be evaluated in the following steps:

x +=y; is equivalent to x = x+y;

x = 20+30;

x = 50;

2. y -=x+z; is equivalent to y = y - (x + z);

y = y - ( 50 + 50);

y = 30 - 100;

y = -70;

3. z *=x*y; is equivalent to z = z * (x * y);

z = z * (50 * (-70));

z = 50 * (-3500);

z = -175000;

In Java, an assignment operation is also considered an expression because the operation has a result. The result of expression is a value which is stored in a variable. It is mainly used in more than one assignments.

For example:

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 related to this concept.

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, value of x will be 30.

y = 130;

6. z = x + y + c;

z = 30 + 130 +100; // Here, value of c will be 100.

z = 260;

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

For example:

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

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

For example:

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 the

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

1. Simple assignment

2. Compound assignment.

3. Assignment as expression.

## Simple Assignment

A simple assignment can be used in two ways:

1. To store or assign a value into a variable.

2. To store a value of a variable into another variable.

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

v = expression;

where,

v: It is a variable name which represents 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:

1. int x = 10;

2. int y = x; // Here, the value of variable x is stored into y.

## Compound Assignment

The general form of compound assignment is as follows:

v op = expression;

where,

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 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 to understand the concept better.

**Program source code 1:**

**package**assignmentOperatorPrograms;

**public class**CompoundTest {

**public static void**main(String[] args) { int x=20, y=30, z=50; x +=y; y -=x+z; z *=x * y; System.out.println("x = " +x ); System.out.println("y = " +y ); System.out.println("z = " +z ); } }

- Output:
x = 50
y = -70
z = -175000

**Explanations:**

1. x +=y; will be evaluated in the following steps:

x +=y; is equivalent to x = x+y;

x = 20+30;

x = 50;

2. y -=x+z; is equivalent to y = y - (x + z);

y = y - ( 50 + 50);

y = 30 - 100;

y = -70;

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, an assignment operation is also considered an expression because the operation has a result. The result of expression is a value which is stored in a variable. It is mainly used in more than one assignments.

For example:

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 related to this concept.

**Program source code 3:**

**package**assignmentOperatorPrograms;

**public class**Expression {

**public static void**main(String[] args) { int a=19, b=31, c=50; a +=1; b -=1; c *=2; int x = (10 + a); int y = x + 100; int z = x + y + c; System.out.println("Value of a: " +a); System.out.println("Value of b: " +b); System.out.println("Value of c: " +c); System.out.println("Value of x: " +x); System.out.println("Value of y: " +y); System.out.println("Value of z: " +z); } }

- Output:
Value of a: 20
Value of b: 30
Value of c: 100
Value of x: 30
Value of y: 130
Value of z: 260

**Explanations:**

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, value of x will be 30.

y = 130;

6. z = x + y + c;

z = 30 + 130 +100; // Here, value of c will be 100.

z = 260;

**Note:**

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

For example:

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

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

For example:

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

**Final words**

Hope that this tutorial has covered all important points related to the

**assignment operators in java**with practical examples and programs. I hope that you will have understood this topic clearly and enjoyed it.

Thanks for reading!