Java 生产者&消费者 —— { }

/**
 * 两个线程协同工作,先生产,再消费
 * 面试题 :
 * sleep 与 wait的区别?
 * sleep:让线程进入休眠状态,让出CPU的时间片,不释放对象监视器的所有权(对象锁)
 * wait:让线程进入等待状态,让出CPU的时间片,并释放对象监视器的所有权,等待其它线程通过notify方法来唤醒
 */
public class ProducterCustomerDemo {
    
    
    public static void main(String[] args) {
    
    
        Food food = new Food();
        Producter p = new Producter(food);
        Customers c = new Customers(food);
        Thread t1 = new Thread(p);
        Thread t2 = new Thread(c);
        t1.start();
        t2.start();
    }
}

/**
 * 消费者
 */
class Customers implements Runnable{
    
    
    private Food food;
    public Customers(Food food){
    
    
        this.food = food;
    }
    @Override
    public void run() {
    
    
        for (int i = 0; i < 20; i++) {
    
    
            food.get();
        }
    }
}

/**
 * 生产者
 */
class Producter implements Runnable{
    
    
    private Food food;

    public Producter(Food food){
    
    
        this.food = food;
    }
    @Override
    public void run() {
    
    
        for (int i = 0; i < 20; i++) {
    
    
            if(i%2==0){
    
    
                food.set("锅包肉","酸甜口味,爽");
            }else{
    
    
                food.set("佛跳墙","大补,滋阴补阳");
            }
        }
    }
}


/**
 * 食物
 */
class Food{
    
    
    private String name;
    private String desc;
    private boolean flag = true; //true表示可以生产,false表示可以消费
    /**
     * 生产产品
     */
    public synchronized void set(String name,String desc){
    
    
        //不能生产 flag==false
        if(!flag){
    
    
            try {
    
    
                this.wait();//线程进入等待状态,释放监视器的所有权(对象锁)
            } catch (InterruptedException e) {
    
    
                e.printStackTrace();
            }
        }
        this.setName(name);
        try {
    
    
            Thread.sleep(500);
        } catch (InterruptedException e) {
    
    
            e.printStackTrace();
        }
        this.setDesc(desc);
        flag = false;
        this.notify();//唤醒等待的线程(随机的其中一个)
    }

    /**
     * 消费产品
     */
    public synchronized void get(){
    
    
        //不能消费 flag==true
        if(flag){
    
    
            try {
    
    
                this.wait();//线程进入等待状态,释放监视器的所有权(对象锁)
            } catch (InterruptedException e) {
    
    
                e.printStackTrace();
            }
        }
        try {
    
    
            Thread.sleep(500);
        } catch (InterruptedException e) {
    
    
            e.printStackTrace();
        }
        System.out.println(this.getName()+"->"+this.getDesc());
        flag = true;
        this.notify();//唤醒等待的线程(随机的其中一个)
    }


    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public String getDesc() {
    
    
        return desc;
    }

    public void setDesc(String desc) {
    
    
        this.desc = desc;
    }

    @Override
    public String toString() {
    
    
        return "Food{" +
                "name='" + name + '\'' +
                ", desc='" + desc + '\'' +
                '}';
    }

    public Food(String name, String desc) {
    
    
        this.name = name;
        this.desc = desc;
    }

    public Food() {
    
    
    }
}

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转载自blog.csdn.net/weixin_43921423/article/details/113339569