操作系統之生產者-消費者

class Resources{
    private int count = 0;

    public synchronized void produce() {
        if(count < 20) {
            count++;
            System.out.println(Thread.currentThread().getName() + "：開始生產第" + count + "個產品");
            notify();
        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public synchronized void consume() {
        if(count > 0) {
            System.out.println(Thread.currentThread().getName() + "：開始消費第"+  count + "個產品");
            count--;
            notify();
        }else{
            try {
                wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

class Producer extends Thread{
    private Resources resource;

    public Producer(Resources resource){
        this.resource = resource;
    }

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + ":開始生產...");

        while(true){
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            resource.produce();
        }
    }
}

class Consumer extends Thread{
    private Resources resource;

    public Consumer(Resources resource){
        this.resource = resource;
    }

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + ":開始消費...");

        while (true) {
            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            resource.consume();
        }
    }

}


public class pv_Test {
    public static void main(String[] args) {
        Resources resource = new Resources();
        Producer p = new Producer(resource);
        p.setName("生產者");

        Consumer v = new Consumer(resource);
        v.setName("消費者");

        p.start();
        v.start();

    }
}