Operators – [Assignment Operators]

Like keywords, variable, and methods - operators too are integral part of all programming languages and one cannot move an inch without it. Java have the following types of operator.

Assignment Operators / Compound Assignment Operators  

Arithmetic Operators

Relational Operators  

Logical Operators     

Bit wise Operator     

Conditional Operator

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Assignment operator(=) used to assign a value to a variable.

int a = 10;

If the varible has an existing value then it will be overwritten by the current one.

Examples :

a = 7; // assigning a litteral

a = a + b; // assigning an an expression

Explicity type casting also used while assigning.

double a=12.566;

int b=(int)a;

Compound Assignment Operators

These operators used while modifying a variable values, that mean the variable should already addigned before. Java have total eleven Compound Assignment Operators.

a=10;

a+=10; // equivalent a=a+10, assign the value of an addition

a-=10;

a*=10;

a/=10;

a%=10;

Following Compound Assignment Operators  used as logical AND, OR, XOR, bitwise left shift, bitwise right shift and  unsigned bitwise right shift :

&=, |= , ^= , <<= , >>=       , >>>=

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Examples

public class OperatorDemo_1

{ 

 

    public static void main(String args[])

    { 

       

        int a=10;

        int b=20;

        System.out.println("Assigned values in Variable a and b "+a+","+b); 

        //Assigning String and Character 

        char ch ='x';

        String name="Sachin";

          //Assigning an expression

        int c = a+b; 

        System.out.println("* * Primitive int Assignment  "+ a); 

        //Implicit Casting of variable x and y 

        double d = a; 

        System.out.println("* * Implicit Type Casting int to double "+ d); 

        d=12.45;

        int x=(int)d;

        System.out.println("* * Explicit Type Casting from double to int "+ x); 

        //Compound Assignment Operators 

        x=25;

        System.out.println("\t**Value of x= "+x);

        x+=10;

        System.out.println("\t\tAfter x+=10  "+x);

        x-=10;

        System.out.println("\t\tAfter x-=10  "+x);

        x*=5;

        System.out.println("\t\tAfter x*=5  "+x);

        x/=2;

        System.out.println("\t\tAfter x/=2  "+x);

        x%=2;

        System.out.println("\t\tAfter x%=2  "+x);

       

        x=25;

        System.out.println("\n\t* Value of x= "+x);

        x&=15;

        System.out.println("\t\tAfter bitwise AND x&=15  "+x);

        x|=2;

         System.out.println("\t\tAfter Bitwise OR x|=2  "+x);

        x^=2;

         System.out.println("\t\tAfter Bitwise XOR x^=2  "+x);

        x<<=2;

         System.out.println("\t\tAfter LEFTSHIFT x<<=2  "+x);

        x>>=2;

         System.out.println("\t\tAfter RIGHTSHIFT x>>=2  "+x);

         x=-10;

         System.out.println("\n\t* Value of x= "+x);

        x>>>=2;

        System.out.println("\t\tAfter RIGHTSHIFT x>>=2  "+x);

     

    } 

}

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Output

Assigned values in Variable a and b 10,20

* * Primitive int Assignment  10

* * Implicit Type Casting int to double 10.0

* * Explicit Type Casting from double to int 12

          **Value of x= 25

                   After x+=10  35

                   After x-=10  25

                   After x*=5  125

                   After x/=2  62

                   After x%=2  0

          * Value of x= 25

                   After bitwise AND x&=15  9

                   After Bitwise OR x|=2  11

                   After Bitwise XOR x^=2  9

                   After LEFTSHIFT x<<=2  36

                   After RIGHTSHIFT x>>=2  9

          * Value of x= -10

                   After RIGHTSHIFT x>>=2  1073741821