Swapping two variables with using third variable in JAVA

class swap
{
   public static void main(String []args)
   {
      int a=25;
      int b=10;
      System.out.println("Intially a="+a+"b="+b);
      a=a+b;
      b=a-b;
      a=a-b;
      System.out.println("a="+a+"\nb="+b);
   }
}