Java——jdk1.5生产者消费者问题优化

之前的代码是唤醒所有的线程，影响了效率，这里对该问题实现优化，具体的细节在代码中与之前的博客比较吧

//使用jdk1.5多线程的实现方式解决一次唤醒所有线程性能低的问题//描述产品import java.util.concurrent.locks.*;class Product{    private String name;    private int count;    private boolean flag;    //1：创建一把锁    private Lock lock = new ReentrantLock();//父类引用指向子类对象，多态    //得到和锁绑定的Condition对象，控制生产线程的唤醒和等待    private Condition pro = lock.newCondition();    //得到和锁绑定的Condition对象，控制消费线程的唤醒和等待    private Condition con = lock.newCondition();    //生产产品的功能    public void produce(String name){        lock.lock();//获取锁        try{            //if(flag){//把if改为while            while(flag){                //IllegalMonitorStateException                try{pro.await();}catch(InterruptedException e){e.printStackTrace();}            }            this.name = name+"..."+count;            System.out.println(Thread.currentThread().getName()+"生产了..."+this.name);            count++;            flag = true;            //唤醒消费线程，不再像之前，唤醒所有线程            con.signal();        }        finally{            lock.unlock();//释放锁        }    }    //消费产品的功能    public void consume(){        lock.lock();        try{            while(!flag){                try{con.await();}catch(InterruptedException e){e.printStackTrace();}            }            System.out.println(Thread.currentThread().getName()+"...消费了..."+this.name);            flag = false;            //唤醒生产线程，不再像之前，唤醒所有线程            pro.signal();        }        finally{            lock.unlock();        }    }}//生产任务class Producer implements Runnable{    private Product pro;    public Producer(Product pro){        this.pro = pro;    }    public void run(){        while(true){            pro.produce("笔记本");        }    }}//消费任务class Consumer implements Runnable{    private Product pro;    public Consumer(Product pro){        this.pro = pro;    }    public void run(){        while(true){            pro.consume();        }    }}class test{    public static void main(String[] args){        Product pro = new Product();        Producer producer = new Producer(pro);        Consumer consumer = new Consumer(pro);        Thread t0 = new Thread(producer);        Thread t1 = new Thread(producer);        Thread t2 = new Thread(consumer);        Thread t3 = new Thread(consumer);        t0.start();        t1.start();        t2.start();        t3.start();    }}