java多线程经典问题（消费者生产者问题)

public class ConsumerProducer {
public static void main(String[] args) {
SyncStack ss = new SyncStack();
Producer p = new Producer(ss);
Consumer c = new Consumer(ss);
new Thread(p).start();
new Thread(c).start();
}
}
class WoTou {
int id;

public WoTou(int id) {
    this.id = id;
}

public String toString() {
    return "WoTou "+id;
}

}

class SyncStack {
int index = 0;
WoTou[] arrwt = new WoTou[6];
public synchronized void push(WoTou wt) { //生产者
while(index==arrwt.length-1) {
try {
this.wait();
}catch(InterruptedException e) {
e.printStackTrace();
}
}
this.notify();
arrwt[index] = wt;
index ++;
}

public synchronized WoTou pop() { //消费者
    while(index==0) {
        try {
            this.wait();
        }catch(InterruptedException e) {
            e.printStackTrace();
        }
    }
    this.notify();
    index--;
    return arrwt[index];
}

}

class Producer implements Runnable {
SyncStack ss = null;

public Producer(SyncStack ss) {
    this.ss = ss;
}

public void run() {
    for(int i=0;i<20;i++) {
        WoTou wt = new WoTou(i);
        ss.push(wt);
        System.out.println("生产了:"+wt);
        try {
            Thread.sleep((int)(Math.random()*50));
        }catch(InterruptedException e) {
            e.printStackTrace();
        }
    }
}

}

class Consumer implements Runnable{
SyncStack ss = null;

public Consumer(SyncStack ss) {
    this.ss = ss;
}

public void run() {
    for(int i=0;i<20;i++) {
        WoTou wt = ss.pop();
        System.out.println("消费了:"+wt);
        try {
            Thread.sleep((int)(Math.random()*1000));
        }catch(InterruptedException e) {
            e.printStackTrace();
        }
    }
}

}