中介（联合国）模式

中介（联合国）模式

• 有好多同级别的工作类，如何统筹他们的调用or通信，降低类之间的耦合。网状交互->星状交互

• view的事件机制：计算机有多个按钮，会有一个统一管理的类，将控件的结果处理后展示在展示框上。

• 与门面Facade模式的区别：中介与各工作类之间时双向通信的，Facade只是单向调用工作类整合后对外提供接口。

  public abstract class Handler {
      protected Mediator mediator;
  
      public Handler(Mediator mediator) {
          this.mediator = mediator;
      }
  
      public abstract void handle(String duty);
  }
  

  public abstract class Mediator {
      public abstract void handleDuty(String duty,Handler handler) ;
  }
  

  public class Mediator1 extends Mediator {
      private Handler1 handler1;
      private Handler2 handler2;
  
      public Mediator1() {
      }
  
      public Mediator1(Handler1 handler1, Handler2 handler2) {
          this.handler1 = handler1;
          this.handler2 = handler2;
      }
  
      public Handler1 getHandler1() {
          return handler1;
      }
  
      public void setHandler1(Handler1 handler1) {
          this.handler1 = handler1;
      }
  
      public Handler2 getHandler2() {
          return handler2;
      }
  
      public void setHandler2(Handler2 handler2) {
          this.handler2 = handler2;
      }
  

  public class Handler1 extends Handler {
      public Handler1(Mediator mediator) {
          super(mediator);
      }
  
      @Override
      public void handle(String duty) {
          mediator.handleDuty(duty,this);
      }
  
      public void actuallyGet(String duty) {
          System.out.println("Handler1 actually get " + duty);
      }
  }
  public class Handler2 extends Handler {
      public Handler2(Mediator mediator) {
          super(mediator);
      }
  
      @Override
      public void handle(String duty) {
          mediator.handleDuty(duty, this);
      }
  
      public void actuallyGet(String duty) {
          System.out.println("Handler2 handle get " + duty);
      }
  }
  
  

• public abstract class Handler {
      protected Mediator mediator;
  
      public Handler(Mediator mediator) {
          this.mediator = mediator;
      }
  
      public abstract void handle(String duty);
  }
  

public abstract class Mediator {
    public abstract void handleDuty(String duty,Handler handler) ;
}

public class Mediator1 extends Mediator {
    private Handler1 handler1;
    private Handler2 handler2;

    public Mediator1() {
    }

    public Mediator1(Handler1 handler1, Handler2 handler2) {
        this.handler1 = handler1;
        this.handler2 = handler2;
    }

    public Handler1 getHandler1() {
        return handler1;
    }

    public void setHandler1(Handler1 handler1) {
        this.handler1 = handler1;
    }

    public Handler2 getHandler2() {
        return handler2;
    }

    public void setHandler2(Handler2 handler2) {
        this.handler2 = handler2;
    }

public class Handler1 extends Handler {
    public Handler1(Mediator mediator) {
        super(mediator);
    }

    @Override
    public void handle(String duty) {
        mediator.handleDuty(duty,this);
    }

    public void actuallyGet(String duty) {
        System.out.println("Handler1 actually get " + duty);
    }
}
public class Handler2 extends Handler {
    public Handler2(Mediator mediator) {
        super(mediator);
    }

    @Override
    public void handle(String duty) {
        mediator.handleDuty(duty, this);
    }

    public void actuallyGet(String duty) {
        System.out.println("Handler2 handle get " + duty);
    }
}