等待唤醒机制

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Java多线程中等待唤醒机制.

wait，notify，notifyAll.三个方法都是对持有锁的线程操作，所以使用在同步过程中.

为什么这些方法定义在Object类中呢？让一个线程等待和唤醒一个线程，必须使用的是同一把锁.不可以对不同锁的线程进行唤醒.而锁可以是任意对象，可以被任意对象调用的方法定义在Object类中.

package com.neutron.thread.wait_notify;/** * 线程通信中共享信息类 * @author zhanght * */public class Resource {private String name;private int age;private boolean flag = false;public synchronized void setResource(String name, int age) {if(this.flag) {try {this.wait();} catch (InterruptedException e) {e.printStackTrace();}}this.name = name;this.age = age;flag = true;this.notify();}public synchronized void getResource() {if (!this.flag) {try {this.wait();} catch (InterruptedException e) {e.printStackTrace();}}System.out.println("name:" + this.name + ", age:" + age);flag = false;this.notify();}public static void main(String[] args){Resource res = new Resource();new Thread(new Input(res)).start();new Thread(new Output(res)).start();}}

package com.neutron.thread.wait_notify;/** * 数据输入 * @author zhanght * */public class Input implements Runnable {private Resource res;public Input(Resource res) {this.res = res;}@Overridepublic void run() {int x = 0;while(true) {if (x == 0) {res.setResource("sky", 11);} else {res.setResource("sea", 21);}x = (x + 1) % 2;}}}

package com.neutron.thread.wait_notify;public class Output implements Runnable {private Resource res;public Output(Resource res) {this.res = res;}@Overridepublic void run() {while(true) {res.getResource();}}}

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