Swapping Two numbers without using a third variable

This is a simple method for swapping the values of two numeric variables without using a third variable.
The sample java code is given below.

public void Swapping(int a, int b)
	{
                System.out.println(Values Before Swapping);
		System.out.println(a+" , "+b);
		a=a+b;
		b=a-b;
		a=a-b;
                System.out.println(Values After Swapping);
		System.out.println(a+" , "+b);
	}