package mythreed;

/**
 * 生產者
 */
public class Producter implements Runnable {

    @Override
    public void run() {
        synchronized (MainApp.lock) {
            while (true) {
                double timer = Math.random();
                try {
                    Thread.sleep((long) (timer * 1000));
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                MainApp.queue.add(timer + "");
                System.out.println("生產了一條資料" + timer);
                if (MainApp.queue.size() > 5) {
                    MainApp.lock.notifyAll();
                    try {
                        System.out.println("生產者等待");
                        MainApp.lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

package mythreed;


/**
 * 消費者
 */
public class Consumer implements Runnable {

    @Override
    public void run() {
        synchronized (MainApp.lock) {
            while (true) {
                for (String msg : MainApp.queue) {
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("消費了一條資料"+MainApp.queue.poll());
                }
                System.out.println("消費者等待");
                MainApp.lock.notifyAll();
                try {
                    MainApp.lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

package mythreed;


import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;

/**
 * 測試生產者消費者
 */
public class MainApp {

    public static volatile Queue<String> queue = new ArrayBlockingQueue<>(6);
    public static Object lock = new Object();

    public static void main(String[] args) {
        Producter producter = new Producter();
        Thread thread1 = new Thread(producter);
        thread1.start();

        Consumer consumer = new Consumer();
        Thread thread2 = new Thread(consumer);
        thread2.start();
    }
}