代码-JavaSE-多线程-多生产者多消费者示例

package ceshi.duoxiancheng.kaoya;

/**
 * 一个烤鸭程序
 * 2个生产者，2个消费者
 * 使用的同步方法是synchronized
 *
 * 写的时候遇到了2个问题：
 * 1：notify()、notifyall()、wait()的调用者，必须和同步的锁是一致的！
 * 2：需要while(true)来保证方法能够多次执行！
 */

class KaoYa {

}

class KaoYaXiangZi {
    final KaoYa[] items = new KaoYa[100];
    int putptr,takeptr,count;

    public void put(KaoYa x) {
        synchronized (this) {
            while (count == 100) {
                try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); }
            }
            items[putptr]=x;
            System.out.println("put KaoYa" + (++putptr));
            count++;
            if (putptr == 100) {
                putptr=0;
            }
            this.notifyAll();
        }
    }

    public void take() {
        synchronized (this) {
            while (count == 0) {
                try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); }
            }
            KaoYa x = items[takeptr];
            System.out.println("take KaoYa"+"..."+(++takeptr));
            count--;
            if (takeptr == 100) {
                takeptr=0;
            }
            this.notifyAll();//锁要和调用此方法的对象是同一个
        }
    }
}

class PutKaoYa implements Runnable{
    private KaoYaXiangZi kaoyaxiangzi;
    public PutKaoYa(){}

    public PutKaoYa(KaoYaXiangZi kaoyaxiangzi) {
        this.kaoyaxiangzi=kaoyaxiangzi;
    }
    public void run() {
        while(true)//必须设置循环，保证可多次执行
        kaoyaxiangzi.put(new KaoYa());
    }
}

class TakeKaoYa implements Runnable{
    private KaoYaXiangZi kaoyaxiangzi;
    public TakeKaoYa(){}

    public TakeKaoYa(KaoYaXiangZi kaoyaxiangzi) {
        this.kaoyaxiangzi=kaoyaxiangzi;
    }
    public void run() {
        while(true)
        kaoyaxiangzi.take();
    }
}

public class SynchronizedDemo {
    public static void main(String[] args) {
        KaoYaXiangZi xiangZi=new KaoYaXiangZi();
        PutKaoYa put1 = new PutKaoYa(xiangZi);
        PutKaoYa put2 = new PutKaoYa(xiangZi);
        TakeKaoYa take1 = new TakeKaoYa(xiangZi);
        TakeKaoYa take2 = new TakeKaoYa(xiangZi);

        Thread t0 = new Thread(put1);
        Thread t1 = new Thread(put2);
        Thread t2 = new Thread(take1);
        Thread t3 = new Thread(take2);

        t0.start();
        t1.start();
        t2.start();
        t3.start();
    }
}