Swapping Two Numbers Without Using 3rd Variable

package practice;

import java.util.*; 	//used for scanner

public class PracticeClass 
{
	public static void main(String args[]) 
	{
		int a,b;
		
		Scanner obj = new Scanner(System.in);
		
		a = obj.nextInt();
		b= obj.nextInt();
		
		System.out.println("Before Swapping");
		System.out.println("value of a : "+a+" Value of b: "+b);
		
		
	    a = a+b;
		b=a-b;
		a=a-b;
		System.out.println("After Swapping");
		System.out.print("value of a : "+a +" Value of b: "+b);
	}
}