二十三种设计模式全面解析-解放组件间的通信束缚：深入探讨中介者模式的高级应用和进阶技巧

import java.util.ArrayList;
import java.util.List;
// 定义事件接口
interface Event {
    void execute();
}
// 定义组件接口
interface Component {
    void setMediator(Mediator mediator);
    void receiveEvent(Event event);
    void sendEvent(Event event);
}
// 定义中介者接口
interface Mediator {
    void registerComponent(Component component);
    void sendEvent(Component sender, Event event);
}
// 实现具体的事件
class ConcreteEvent implements Event {
    private String message;
    public ConcreteEvent(String message) {
        this.message = message;
    }
    public void execute() {
        System.out.println("Executing event: " + message);
    }
}
// 实现具体的组件
class ConcreteComponent implements Component {
    private Mediator mediator;
    private String name;
    public ConcreteComponent(String name) {
        this.name = name;
    }
    public void setMediator(Mediator mediator) {
        this.mediator = mediator;
    }
    public void receiveEvent(Event event) {
        System.out.println(name + " received event: " + event);
        // 处理事件逻辑
    }
    public void sendEvent(Event event) {
        System.out.println(name + " sending event: " + event);
        mediator.sendEvent(this, event);
    }
}
// 实现具体的中介者
class ConcreteMediator implements Mediator {
    private List<Component> components;
    private Mediator nextMediator;
    public ConcreteMediator() {
        components = new ArrayList<>();
    }
    public void setNextMediator(Mediator mediator) {
        this.nextMediator = mediator;
    }
    public void registerComponent(Component component) {
        components.add(component);
    }
    public void sendEvent(Component sender, Event event) {
        for (Component component : components) {
            if (component != sender) {
                component.receiveEvent(event);
            }
        }
        if (nextMediator != null) {
            nextMediator.sendEvent(sender, event);
        }
    }
}
public class Main {
    public static void main(String[] args) {
        Mediator mediator1 = new ConcreteMediator();
        Mediator mediator2 = new ConcreteMediator();
        Mediator mediator3 = new ConcreteMediator();
        Component component1 = new ConcreteComponent("Component 1");
        Component component2 = new ConcreteComponent("Component 2");
        Component component3 = new ConcreteComponent("Component 3");
        mediator1.registerComponent(component1);
        mediator2.registerComponent(component2);
        mediator3.registerComponent(component3);
        mediator1.setNextMediator(mediator2);
        mediator2.setNextMediator(mediator3);
        component1.setMediator(mediator1);
        component2.setMediator(mediator2);
        component3.setMediator(mediator3);
        Event event = new ConcreteEvent("Hello, world!");
        component1.sendEvent(event);
    }
}