Java笔记 - 线程间通讯 - 等待唤醒机制2

来源：互联网发布：2017全国淘宝人数编辑：程序博客网时间：2024/05/23 19:18

wait()

notifilyAll()

class Resource{private String name;private int count = 1;private boolean flag = false;public synchronized void set (String name){while(flag){try{this.wait();}catch(Exception e){}}this.name = name + "--" + count++;System.out.println(Thread.currentThread().getName()+"...生产者..."+this.name);flag = true;this.notifyAll();}public synchronized void out(){while(!flag){try{wait();}catch(Exception e){}}System.out.println(Thread.currentThread().getName()+"...消费者........"+this.name);flag = false;this.notifyAll();}}class Producer implements Runnable{private Resource res;Producer(Resource res){this.res = res;}public void run(){while(true){res.set("+商品+");}}}class Consumer implements Runnable{private Resource res;Consumer(Resource res){this.res = res;}public void run(){while(true){res.out();}}}public class ProducerConsumerDemo {public static void main(String[] args){Resource r = new Resource();Producer pro = new Producer(r);Consumer con = new Consumer(r);Thread t1 = new Thread(pro);Thread t2 = new Thread(pro);Thread t3 = new Thread(con);Thread t4 = new Thread(con);t1.start();t2.start();t3.start();t4.start();}}

JDK1.5 可以唤醒指定的线程

将同步Synchronized替换成实现Lock操作

将Object中的wait，nofity，notifyAll，替换了Condition对象

该对象可以Lock锁，进行获取

import java.util.concurrent.locks.*;class Resource{private String name;private int count = 1;private boolean flag = false;private Lock lock = new ReentrantLock();private Condition condition_pro = lock.newCondition();private Condition condition_con = lock.newCondition();public synchronized void set (String name)throws InterruptedException{lock.lock();try{while(flag){condition_pro.await();}this.name = name + "--" + count++;System.out.println(Thread.currentThread().getName()+"...生产者..."+this.name);flag = true;condition_con.signal();}finally{lock.unlock();}}public void out()throws InterruptedException{lock.lock();try{while(!flag){condition_con.await();}System.out.println(Thread.currentThread().getName()+"...消费者........"+this.name);flag = false;condition_pro.signal();}finally{lock.unlock();}}}class Producer implements Runnable{private Resource res;Producer(Resource res){this.res = res;}public void run(){while(true){try{res.set("+商品+");}catch(InterruptedException e){}}}}class Consumer implements Runnable{private Resource res;Consumer(Resource res){this.res = res;}public void run(){while(true){try{res.out();}catch(InterruptedException e){}}}}public class ProducerConsumerDemo {public static void main(String[] args){Resource r = new Resource();Producer pro = new Producer(r);Consumer con = new Consumer(r);Thread t1 = new Thread(pro);Thread t2 = new Thread(pro);Thread t3 = new Thread(con);Thread t4 = new Thread(con);t1.start();t2.start();t3.start();t4.start();}}

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