Other Operators in Java

Assignment Operator

   Assignment operator is used to assign a value to a variable.

   Syntax

      type variable = value;

   Example

      int a = 10.

      int b = 20

Java supports compound assignments

   Compound Assignment

      Syntax:

         variable operator= value

      Example:

         lets say

         int a = 10;

         a+=10 evaluates to a=a+10

Compound Operator	Example	Description
+=	a+=10	a=a+10
-=	a-=10	a=a-10
*=	a*=10	a=a*10
/=	a/=10	a=a/10

Example Program

class CompoundAssignment{
 public static void main(String args[]){
  int var1 = 100;
  int sum=10, sub=10, mul=10, div=1000;

  System.out.println("sum+var1 is " + (sum+=var1));
  System.out.println("sub-var1 is " + (sub-=var1));
  System.out.println("mul*var1 is " + (mul*=var1));
  System.out.println("div/var1 is" + (div/=var1));
 }
}

         

Output

sum+var1 is 110
sub-var1 is -90 
mul*var1 is 1000 
div/var1 is10

The Type Comparison Operator instanceof

The instanceof operator compares an object to a specified type. You can use it to test if an object is an instance of a class, an instance of a subclass, or an instance of a class that implements a particular interface.

Example

class InstanceOfEx{
 public static void main(String args[]){
  Object obj = new Object();
  System.out.println(obj instanceof Object);
  System.out.println(obj instanceof InstanceOfEx);
 }
}

Output

true
false

   

Don't worry much about this program, you will learn about this while discussing about class and object.

Ternary operator( ?: )

   Returns one of two expressions depending on a condition.

    Syntax

       test ? expression1 : expression2

          Returns expression1 if the “test” condition evaluates to true other wise returns expression 2.

Example

class TernaryEx{
 public static void main(String args[]){
  int a = 100;
  
  int flag = a>10 ? 1 : 0;
  System.out.println(flag);
  
  flag = a>1000 ? 1 : 0;
  System.out.println(flag);
 }
}

Output

1
0

Observation

See the statement “flag = a>10 ? 1 : 0”, a>10 is true, so 1 is returned and assigned to the flag

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