Java回调兑现

Java回调实现
Java回调实现?有个这样的问题：老板（Boss）让工人（Worker）干完活告诉他干的情况如何。?实际上是一个典型的回调问题，Java实现如下：?/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:18:33
* 事件接口
*/
public interface Event {
????/**
???? * 返回发生事件信息
???? *
???? * @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 {
????/**
???? * 返回发生事件信息
???? *
???? * @return 事件信息
???? */
????public String happendEvent() {
????????return "发生了事件 EventA！";
????}
}?/**
* Created by IntelliJ IDEA.
* User: leizhimin
* Date: 2008-7-31 13:18:21
* 事件B
*/
public class EventB implements Event{
????/**
???? * 返回发生事件信息
???? * @return 事件信息
???? */
????public String happendEvent() {
????????return "发生了事件 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;??????//工人所属的老板

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

????/**
???? * 干活
???? */
????public void doWork() {
????????System.out.println(name + " is doing working...");
????????//工人挺辛苦，干着枯燥乏味的重复工作，哈哈
????????for (int i = 0; i < 2000000; i++) {
????????????int x = i / 234 + 234;
????????}
????????System.out.println(name + " was finished work.");
????????//向老板说明发生的情况
????????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
* 测试类
*/
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("张三",boss);
????????Worker worker2= new Worker("李四",boss);

????????//捏造两个事件
????????Event event1 = new EventA();
????????Event event2 = new EventB();

????????//事件是工人发出的
????????worker1.setEvent(event1);
????????worker2.setEvent(event2);

????????//工人干活，干完了通知老板干的情况如何
????????worker1.doWork();
????????worker2.doWork();

????}
}?运行结果：张三 is doing working...
张三 was finished work.
老板接收到事件信息：张三: 发生了事件 EventA！
李四 is doing working...
李四 was finished work.
老板接收到事件信息：李四: 发生了事件 EventB！

Process finished with exit code 0
?呵呵，工人干活完成后，自动将发生的事件汇报给老板。?当然，如果工人很多，每个人都汇报的话，老板肯定会烦，那么老板可能会下达，发生了严重问题的员工才需要汇报问题。这个时候，需要做个事件过滤。转自：http://lavasoft.blog.51cto.com/62575/90453

Java回调兑现

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