[Java] Thread-05- 线程同步-生产者与消费者的经典问题
package com.bjsxt.chap9Thread; 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) { while (index == arrWT.length) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } this.notifyAll(); arrWT[index] = wt; index++; } public synchronized WoTou pop() { while (index == 0) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } this.notifyAll(); index--; return arrWT[index]; } } class Producer implements Runnable { 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 { SyncStack ss = null; 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(); } } } }
生产者与消费者的经典问题
Wait 与 Sleep 的区别 : Wait 时,别的线程可以访问锁定对象。sleep 就是睡着了,也抱着这把锁,别的线程无法访问该锁定对象。