java中生產者消費者問題和程式碼案例

//使用緩衝區解決生產者消費者模型
public class TestPC {
    public static void main(String[] args) {
        SynContainer container = new SynContainer();
        new Producer(container).start();
        new Consumer(container).start();
    }
}
​
class Producer extends Thread{
    SynContainer synContainer;
    public Producer(SynContainer synContainer){
        this.synContainer = synContainer;
    }
    //  生產
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            synContainer.push(new Chicken(i));
            System.out.println("生產了"+i+"只雞");
        }
    }
}
​
class Consumer extends Thread{
    SynContainer synContainer;
    public Consumer(SynContainer synContainer){
        this.synContainer = synContainer;
    }
    //  消費
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            System.out.println("消費了-->"+synContainer.pop().id+"只雞");
        }
    }
}
​
//產品
class Chicken{
    int id;
    public Chicken(int id) {
        this.id = id;
    }
}
​
//緩衝區
class SynContainer{
    Chicken[] chickens = new Chicken[10];
    int count = 0;
    //生產者放入產品
    public synchronized void push(Chicken chicken){
        //如果容器滿了就要等到消費者消費
        if (count==chickens.length){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //通知消費者消費，自身進入等待
        }
        //沒有滿的話則生產
        chickens[count] = chicken;
        count++;
        //通知消費者消費
        this.notifyAll();
    }
​
    //生產者消費產品
    public synchronized Chicken pop(){
        if (count==0){
            //等待生產者生產
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        count--;
        Chicken chicken = chickens[count];
        //消費了，可以通知生產者繼續生產
        this.notifyAll();
        return chicken;
    }
}

//訊號燈法測試生產者消費者模型 即標誌位
public class TestPC2 {
    public static void main(String[] args) {
        TV tv = new TV();
        new Player(tv).start();
        new Audiance(tv).start();
    }
​
}
​
//生產者-->演員
class Player extends Thread {
    TV tv;
    public Player(TV tv){
        this.tv = tv;
    }
​
    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if (i%2==0){
                this.tv.play("天天向上");
            }else {
                this.tv.play("抖音廣告");
            }
        }
    }
}
​
//消費者-->觀眾
class  Audiance extends Thread{
    TV tv;
    public Audiance(TV tv){
        this.tv = tv;
    }
​
    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            tv.watch();
        }
    }
}
​
//產品-->節目
class TV{
    //演員表演 觀眾等待 T
    //觀眾觀看 演員等待 F
    String show;//表演的節目
    boolean flag = true;
​
    //表演
    public synchronized void play(String show){
        if (!flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("演員表演了："+show);
        //通知觀眾
        this.notifyAll();
        this.show = show;
        this.flag = !this.flag;
    }
​
    //觀看
    public synchronized void watch(){
        if (flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("觀看了"+show);
        //通知演員表演
        this.notifyAll();
        this.flag = !this.flag;
    }
}