JAVA 线程间通信 -生产者消费者JDK5.0升级版

/*
JDK1.5中提供了多线程升级解决方案
将同步Synchronized替换成现实Lock操作
将Object中的wait，notify, notifyAll,替换成了Condition对象
该对象可以是Lock锁，进行获取
*/

import java.util.concurrent.locks.*;

class Res
{
private int count=0;
private String name;

private	boolean flag = false;

private Lock lock = new ReentrantLock();//申请锁

private Condition condition_pro = lock.newCondition();//控制生产者的 唤醒和等待
private Condition condition_con = lock.newCondition();//控制消费者的 唤醒和等待

public void set(String name)throws InterruptedException
{
lock.lock();//上锁
try
{
while(flag)
condition_pro.await();//生产者等待
this.name = name+ " "+ (++count);
System.out.println(Thread.currentThread().getName() + "--生产者--" + this.name);

flag = true;
condition_con.signal();//消费者唤醒

}
finally
{
lock.unlock();//解锁
}
}

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
{
Res r = new Res();

Producer(Res r)
{
this.r = r;
}

public void run()
{
while(true)
try
{
r.set("商品");
}
catch(InterruptedException e)
{}
}
}

class Consumer implements Runnable
{
Res r = new Res();

Consumer(Res r)
{
this.r = r;
}

public void run()
{
while(true)
try
{
r.out();
}
catch(InterruptedException e)
{}
}

}

class TestDemo
{
public static void main(String []args)
{
Res r = new Res();

Producer p = new Producer(r);
Consumer c = new Consumer(r);

Thread t1 = new Thread(p);
Thread t2 = new Thread(c);
Thread t3 = new Thread(p);
Thread t4 = new Thread(c);

t1.start();
t2.start();
t3.start();
t4.start();
}
}