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