Object类中的wait和notify方法(生产者和消费者模式) 不是通过线程调用
- wait(): 让正在当前对象上活动的线程进入等待状态,无期限等待,直到被唤醒为止
- notify(): 让正在当前对象上等待的线程唤醒
- notifyAll(): 唤醒当前对象上处于等待的所有线程
生产者和消费者模式 生产线程和消费线程达到均衡
wait方法和notify方法建立在synchronized线程同步的基础之上
- wait方法: 释放当前对象占有的锁
- notify方法: 通知,不会释放锁
实现生产者和消费者模式 仓库容量为10
代码如下
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import java.util.ArrayList; public class Test_14 { public static void main(String[] args) { ArrayList list = new ArrayList(); Thread t1 = new Thread( new ProducerThread(list)); t1.setName( "producer" ); Thread t2 = new Thread( new ConsumerThread(list)); t2.setName( "consumer" ); t1.start(); t2.start(); } } //生产者线程 class ProducerThread implements Runnable{ private ArrayList arrayList; public ProducerThread(ArrayList arrayList) { this .arrayList = arrayList; } @Override public void run() { while ( true ) { synchronized (arrayList) { if (arrayList.size() > 9 ){ try { arrayList.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } try { Thread.sleep( 1000 ); } catch (InterruptedException e) { e.printStackTrace(); } arrayList.add( new Object()); System.out.println(Thread.currentThread().getName() + "---> 生产" + "---库存" + arrayList.size()); arrayList.notify(); } } } } //消费者线程 class ConsumerThread implements Runnable{ private ArrayList arrayList; public ConsumerThread(ArrayList arrayList) { this .arrayList = arrayList; } @Override public void run() { while ( true ){ synchronized (arrayList){ if (arrayList.size() < 9 ){ try { arrayList.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } try { Thread.sleep( 1000 ); } catch (InterruptedException e) { e.printStackTrace(); } arrayList.remove( 0 ); System.out.println(Thread.currentThread().getName() + "---> 消费" + "---库存" + arrayList.size()); arrayList.notify(); } } } } |
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原文链接:https://www.cnblogs.com/llcy/p/13468480.html