What is the result(TreeSet)? : Questions « Utility Classes « SCJP

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import java.util.TreeSet;

class Dog {
  int size;

  public Dog(int s) {
    size = s;
  }
}

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

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