This tutorial will help you to understand assignment operator in java.
Assignment operator in java
Assignment operator is very common to almost all programming languages. It is represented as "=" symbol which assign the value to the variable lying on the left side. Java assignment operator evaluated from right to left, in the right side is the value which have to be assigned to the variable to the left side. Assignment operator is also used to assign object reference. Java allow to use shorthand means combining the assignment operator with the arithmetic operator. It is called compound assignment. In the table below showing shorthand operator:
Syntax : <variable> = <expression or constant>
Example :
public class Demo
{
public static void main(String args])
{
int a=b=c=2;
int result=0;
result = a + b;
c = a + b;
System.out.println("Value of result = " +result);
System.out.println("Value of c = "+c);
}
}
The above example show the uses of assignment operator, You can also assign a value to three variable simultaneously. How it works is, value 2 is assigned to c, then c to b. then b to a. In second expression value of a and b is added and then assigned to c.
The table show all short hand operator:
| Operator | Example | Equivalent expression |
|---|---|---|
| += | a+=1 | a=a+1 |
| -= | a-=1 | a=a-1 |
| *= | a*=1 | a=a*1 |
| /= | a/=1 | a=a/1 |
| %= | a%=1 | a=a%1 |
A simple example using compound assignment:
public class Assignment {
public static void main(String args[])
{
int a=2;
int b=3;
a+=b;
System.out.println("value of a after addition is ="+a);
a-=b;
System.out.println("value of a after subtraction = "+a);
a*=b;
System.out.println("value of a after multiplication = "+a);
a/=b;
System.out.println("value of a after division = "+a);
}
}
Output of the program
