Java 3

package xxx;
//import java.util.Scanner;

public class abc 
{
       public static void main(String args[]) 
       {
           //Scanner a = new Scanner(System.in); 
           //Scanner b = new Scanner(System.in);
           int a=5;
           int b=7;
           a=a^b;
           b=a^b;
           a=a^b;
           System.out.print("a="+a+"\n"+"b="+b);
       }
      
}