多线程生产者与消费者问题的总结

最新推荐文章于 2021-01-21 13:17:40 发布

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最新推荐文章于 2021-01-21 13:17:40 发布

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分类专栏：多线程编程文章标签： string java 多线程 boolean

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本文介绍了一个使用Java实现的生产者消费者模式案例。通过一个共享资源类Resource，利用synchronized关键字和wait/notifyAll方法实现线程间的同步和通信。两个生产者线程和两个消费者线程演示了该模式的基本工作流程。

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class Resource{
private String name;
private int count;
private boolean flag;
public synchronized void set(String name){
while(flag){
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
this.name = name+“—”+count++;
System.out.println(Thread.currentThread().getName()+”生产者”+this.name);
flag = true;
notifyAll();
}
public synchronized void get(){
while(!flag){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
System.out.println(Thread.currentThread().getName()+”–消费者–”+this.name);
flag = false;
notifyAll();
}
}
class Producer implements Runnable{
private Resource res;
Producer(Resource res){
this.res = res;
}
public void run(){
while(true){
res.set(”+商品+”);
}
}
}
class Consumer implements Runnable{
private Resource res;
Consumer(Resource res){
this.res = res;
}
public void run(){
while(true){
res.get();
}
}
}
public class ProducerConsumer {
public static void main(String[] args) {
Resource res = new Resource();
Producer pro = new Producer(res);
Consumer con = new Consumer(res);
Thread t1 = new Thread(pro);
Thread t2 = new Thread(con);
Thread t3 = new Thread(pro);
Thread t4 = new Thread(con);
t1.start();
t2.start();
t3.start();
t4.start();
}
}

class Resource{
    private String name;
    private int count;
    private boolean flag;

    public synchronized void set(String name){
        while(flag){
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        this.name = name+"---"+count++;
        System.out.println(Thread.currentThread().getName()+"生产者"+this.name);
        flag = true;
        notifyAll();

    }
    public synchronized void get(){
        while(!flag){
            try{
            wait();
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName()+"--消费者--"+this.name);
        flag = false;
        notifyAll();
    }
}

class Producer implements Runnable{
    private Resource res;

    Producer(Resource res){
        this.res = res;

    }

    public void run(){
        while(true){
            res.set("+商品+");
        }
    }
}

class Consumer implements Runnable{
    private Resource res;
    Consumer(Resource res){
        this.res = res;
    }

    public void run(){
        while(true){
            res.get();
        }
    }
}

public class ProducerConsumer {
    public static void main(String[] args) {
        Resource res = new Resource();
        Producer pro = new Producer(res);
        Consumer con = new Consumer(res);
        Thread t1 = new Thread(pro);
        Thread t2 = new Thread(con);
        Thread t3 = new Thread(pro);
        Thread t4 = new Thread(con);

        t1.start();
        t2.start();
        t3.start();
        t4.start();

    }

}