public class ConcreteColleague2 extends Colleague{
  public ConcreteColleague2(Mediator mediator) {
    super(mediator);
  }

  public void send(String message) {
    mediator.send(message, this);
  }

  public void notify(String message) {
    System.out.println("ConcreteColleague2は" + message + "を受け取りました");
  }
}