Swapping numbers without temps

Within this program I am swapping numbers without temps. The program will print out the numbers when they are swapped after.


public class SwappingNumbersWithoutTemps
{
    public static void swap_opt(int a, int b)
    {
        a = a-b;

        b = a+b;

        a = b-a;

       System.out.println("a:" + a);

       System.out.println("B:" + b);

    }//swap

    public static void main(String [] args)
    {
        swap_opt(100, 200);
    }//main

}//class

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