swapping

Swapping means exchanging the values of two variables.
For example:

Before swap: a = 10, b = 20

After swap: a = 20, b = 10

public class Swapping {

int a ;
int b ;

Swapping (int a , int b ){

    this.a = a;
    this.b = b;


}

public void swap(){
    int temp;
     temp  = a ;
    a = b ;
     b = temp ;

}
public static void main(String[] args) {
    Swapping big = new Swapping (10,20);
   System.out.println("before swap");
   System.out.println(big.a);
   System.err.println(big.b);
   big.swap();
    System.out.println("after swap");
   System.out.println(big.a);
   System.err.println(big.b);
}

}

Explanation
int a, b: These are instance variables used to store the values.

Swapping(int a, int b): This is a constructor that sets the initial values of a and b.

swap(): A method that uses a temporary variable to swap the values of a and b.

main(): The program execution starts here. It creates an object and demonstrates the swap.

Output

Before swap:
a = 10
b = 20

After swap:
a = 20
b = 10