public class ProducerConsumer {
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(p).start();
new Thread(p).start();
new Thread(c).start();
}
}
class WoTou {
int id;
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) {//同步控制,只允许独立进行
while (index == arrWT.length) { //控制数量,不能超过可以承受的最大数量
try {
this.wait(); //当前访问的synchronized型线程wait,锁让给其他线程
} catch (InterruptedException e) {
e.printStackTrace();
}
}
//如果不叫醒则会产生死锁
// this.notify(); //叫醒一个当前对象正在wait的线程
this.notifyAll();
arrWT[index] = wt;
index++;
}
public synchronized WoTou pop() { //同步控制,只允许独立进行
while (index == 0) { //用if,如果catch到异常则会退出等待,继续执行
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.notifyAll();
index--;
return arrWT[index];
}
}
class Producer implements Runnable { //生产者进程
SyncStack ss = null;
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() * 200));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer implements Runnable { //消费者进程
SyncStack ss = null;
Consumer(SyncStack ss) {
this.ss = ss;
}
public void run() {
for (int i = 0; i < 60; i++) {
WoTou wt = ss.pop();
System.out.println("消费了: " + wt);
try {
Thread.sleep((int) (Math.random() * 1000));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
生产者消费者问题
最新推荐文章于 2024-07-18 14:16:46 发布