public class TBreuk1 {
   public static void main(String[] args) {
      Breuk1 b1=new Breuk1(1, 2);
      Breuk1 b2=new Breuk1(3);
      Breuk1 b3=new Breuk1(b1);
      b2.add(b1);
      System.out.println("b2 = "+b2);
      if (b1!=b3)
         System.out.println("Vreemd!!");
   }
}