public class Main {
  public static void main(String [] args) {
    Person p1 = new Person(1234567890L,"Jane Doe");
    Person p2 = new Person(1234567890L,"Jane Doe");
    Obj o3 = new Signed(7);

    System.out.print("p1==p2: ");
    System.out.println(p1==p2);
    System.out.print("p1.equals(p2): ");
    System.out.println(p1.equals(p2));
    System.out.print("p1.equals(o3): ");
    System.out.println(p1.equals(o3));
  }
}