// Facade 类，为客户机访问一组底层子系统提供简化接口
public class Facade {

    private Subsystem1 subsystem1;
    private Subsystem2 subsystem2;

    public Facade() {
        subsystem1 = new Subsystem1();
        subsystem2 = new Subsystem2();
    }

    // 调用底层子系统提供简化操作
    public void operation() {
        subsystem1.operation1();
        subsystem2.operation2();
    }
}

// Mediator 类别，用于协调通信和交互，避免对象之间的紧耦合
public class Mediator {

    private List<Colleague> colleagues;

    public Mediator() {
        colleagues = new ArrayList<>();
    }

    // 注册同事对象
    public void register(Colleague colleague) {
        colleagues.add(colleague);
    }

    // 协调同事之间的沟通和交互
    public void send(String message, Colleague sender) {
        for (Colleague colleague : colleagues) {
            // 如果不是发送者，则转发信息
            if (!colleague.equals(sender)) {
                colleague.receive(message);
            }
        }
    }
}