Java回調實現（三）

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:18:33
* 事件接口
*/
public interface Event {
    /**
     * 返回發生事件信息
     *
     * @return 事件信息
     */
    public String happendEvent();
}

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:18:14
* 事件A
*/
public class EventA implements Event {
    /**
     * 返回發生事件信息
     *
     * @return 事件信息
     */
    public String happendEvent() {
        return "發生了事件 EventA！";
    }
}

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:18:21
* 事件B
*/
public class EventB implements Event{
    /**
     * 返回發生事件信息
     * @return 事件信息
     */
    public String happendEvent() {
        return "發生了事件 EventB！";
    }
}

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:20:48
* 工人
*/
public class Worker {
    private Event event;    //事件
    private String name;    //工人姓名
    private Boss boss;      //工人所屬的老板

    public Worker(String name, Boss boss) {
        this.name = name;
        this.boss = boss;
    }

    /**
     * 幹活
     */
    public void doWork() {
        System.out.println(name + " is doing working...");
        //工人挺辛苦，幹著枯燥乏味的重複工作，哈哈
        for (int i = 0; i < 2000000; i++) {
            int x = i / 234 + 234;
        }
        System.out.println(name + " was finished work.");
        //向老板說明發生的情況
        boss.getWorkerEvent(this, event);
    }

    public Event getEvent() {
        return event;
    }

    public void setEvent(Event event) {
        this.event = event;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:26:22
* 老板
*/
public class Boss {
    private String name;

    public Boss(String name) {
        this.name = name;
    }

    /**
     * 老板接收工人的事件
     * @param worker 工人
     * @param event  事件
     */
    public void getWorkerEvent(Worker worker, Event event) {
        System.out.println("老板接收到事件信息： "+worker.getName() + ": " + event.happendEvent());
    }
}

/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:35:38
* 測試類
*/
public class Test {
    public static void main(String args[]){
        //初始化老板和工人
        Boss boss = new Boss("老板");
        Worker worker1= new Worker("張三",boss);
        Worker worker2= new Worker("李四",boss);

        //捏造兩個事件
        Event event1 = new EventA();
        Event event2 = new EventB();

        //事件是工人發出的
        worker1.setEvent(event1);
        worker2.setEvent(event2);

        //工人幹活，幹完了通知老板幹的情況如何
        worker1.doWork();
        worker2.doWork();

    }
}

張三 is doing working...
張三 was finished work.
老板接收到事件信息： 張三: 發生了事件 EventA！
李四 is doing working...
李四 was finished work.
老板接收到事件信息： 李四: 發生了事件 EventB！

Process finished with exit code 0