Q. Write a simple program to swap the numbers.

Like if we have – 

a=20;

b=30;

I want a=30; and b=20;

SOLUTION :-

package p1;

public class SwapNumbers {

public static void main(String[] args) {

    int a=20;
    int b=30;

    System.out.println("Before swapping:a:"+a+",b:"+b);

    int temp = a;
    a=b;
    b=temp;

    System.out.println("After swapping:a:="+a+", b:"+b);

}

}