Compound-Assignment Operators

Compound-assignment operators provide a shorter syntax for assigning the result of an arithmetic or bitwise operator. They perform the operation on the two operands before assigning the result to the first operand.

Compound-Assignment Operators in Java

Java supports 11 compound-assignment operators:

 +=   assigns the result of the addition.
 -=   assigns the result of the subtraction.
 *=   assigns the result of the multiplication
 /=   assigns the result of the division.
 %=   assigns the remainder of the division.
 &=   assigns the result of the logical AND.
 |=   assigns the result of the logical OR.
 ^=   assigns the result of the logical XOR.
 <<=  assigns the result of the signed left bit shift.
 >>=  assigns the result of the signed right bit shift.
 >>>= assigns the result of the unsigned right bit shift.

Example Usage

To assign the result of an addition operation to a variable using the standard syntax:

 //add 2 to the value of number
 number = number + 2; 

But use a compound-assignment operator to effect the same outcome with the simpler syntax:

 //add 2 to the value of number
 number += 2;