class Swap
              {
              void swap()
              {
              int num1 = 10;
              int num2 = 20;
              int temp;
              
              System.out.println(" ");
              System.out.println("Program to SWAP TWO NUMBERS");
              System.out.println(" ");
              
              System.out.println("Before Swapping first number is : " + num1);
              System.out.println("Before Swapping Second number is : " + num2);
              
              System.out.println(" ");
              temp = num1;
              num1 = num2;
              num2 = temp;
              
              System.out.println("After Swapping first number is : " + num1);
              System.out.println("After Swapping Second number is : " + num2);
              }
              public static void main(String args[])
              {
              Swap s = new Swap();
              s.swap();
              }
              }