Java OCA OCP Practice Question 1228

import java.util.TreeSet;

class MyClass {//from   ww  w. j  a  v  a 2 s.c om
   int size;

   MyClass(int s) {
      size = s;
   }
}

public class Main {
   public static void main(String[] args) {
      TreeSet<Integer> i = new TreeSet<Integer>();
      TreeSet<MyClass> d = new TreeSet<MyClass>();

      d.add(new MyClass(1));
      d.add(new MyClass(2));
      d.add(new MyClass(1));
      i.add(1);
      i.add(2);
      i.add(1);
      System.out.println(d.size() + " " + i.size());
   }
}