阻塞队列，来写生产者消费者，生产一个消费一个

用阻塞队列来写，就不需要程序员来关心什么时候阻塞线程await，什么时候唤醒线程notify（）。

类似消息中间件

package JUC;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 3.0版生产者消费者（不用程序员控制，用阻塞队列）
 */
class MyResource{
    private volatile boolean FLAG = true; //默认打开，进行生产+消费
    private AtomicInteger atomicInteger = new AtomicInteger(1);

    //BlockingQueue如果要适配所有类的话，要传接口，不能传类
    BlockingQueue<String> blockingQueue = null;
    public MyResource(BlockingQueue<String> blockingQueue) {
        this.blockingQueue = blockingQueue;
        System.out.println(blockingQueue.getClass().getName()); //显示传的什么类
    }

    public void myProducer() throws Exception{
        String data = null;
        boolean retValue;
        while(FLAG){
            data = atomicInteger.getAndIncrement()+"";
            retValue = blockingQueue.offer(data,2L, TimeUnit.SECONDS);
            if (retValue){
                System.out.println(Thread.currentThread().getName()+"\t 插入队列"+data+"成功");
            }else {
                System.out.println(Thread.currentThread().getName()+"\t 插入队列"+data+"失败");
            }
            TimeUnit.SECONDS.sleep(1);
        }
        System.out.println(Thread.currentThread().getName()+"\t大老板叫停，表示FLAG=false，生产动作结束");
    }

    public void myConsumer() throws Exception{
        String result = null;
        while (FLAG){
            result = blockingQueue.poll(2L,TimeUnit.SECONDS);
            if (result == null || result.equalsIgnoreCase("")){
                FLAG = false;
                System.out.println(Thread.currentThread().getName()+"\t超过2秒钟没有取到蛋糕，消费退出");
                return;
            }
            System.out.println(Thread.currentThread().getName()+"\t消费队列"+result+"成功");
        }
    }

    public void stop() throws Exception{
        this.FLAG = false;
    }
}
public class ProdConsumer_BlockQueueDemo {
    public static void main(String[] args) {
        MyResource myResource = new MyResource(new ArrayBlockingQueue<>(3));

        new Thread(()->{
            System.out.println(Thread.currentThread().getName()+"\t生产线程启动");
            try {
                myResource.myProducer();
            } catch (Exception e) {
                e.printStackTrace();
            }
        },"producer").start();

        new Thread(()->{
            System.out.println(Thread.currentThread().getName()+"\t消费线程启动");
            System.out.println();
            System.out.println();
            try {
                myResource.myConsumer();
                System.out.println();
                System.out.println();
            } catch (Exception e) {
                e.printStackTrace();
            }
        },"consumer").start();

        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println();
        System.out.println();
        System.out.println("5秒钟时间到，大老板main线程叫停，游戏结束！");

        try {
            myResource.stop();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}