Write a program for swapping two numbers without using third variable

class Swap

{

public static void main(String[] arg)

{

          System.out.println("swapping of two number without using third number");

          int num1=Integer.parseInt(arg[0]);

          int num2=Integer.parseInt(arg[1]);

          System.out.println("first no.="+num1);

          System.out.println("second no.="+num2);

          num1=num1+num2;

          num2=num1-num2;

          num1=num1-num2;

          System.out.println("after swapping");

          System.out.println("first no.="+num1);

          System.out.println("second no.="+num2);

}

}