JUC自学：阻塞队列的四组API

李李李iiii

已于 2022-05-31 14:41:16 修改

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分类专栏： JUC 文章标签： java

于 2022-05-26 03:09:40 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_48883622/article/details/124977454

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实验代码如下：主程序已省略。

public static void test1(){
        ArrayBlockingQueue arrayBlockingQueue = new ArrayBlockingQueue<>(4);

        //会抛出异常
        System.out.println(arrayBlockingQueue.add("a"));
        System.out.println(arrayBlockingQueue.add("b"));
        System.out.println(arrayBlockingQueue.add("c"));
        System.out.println(arrayBlockingQueue.add("d"));

        System.out.println("-----------------------------");
        //检测队首元素
        System.out.println(arrayBlockingQueue.element());

        System.out.println(arrayBlockingQueue.remove());
        System.out.println(arrayBlockingQueue.remove());
        System.out.println(arrayBlockingQueue.remove());
        System.out.println(arrayBlockingQueue.remove());

    }

    public static  void test2(){
        ArrayBlockingQueue arrayBlockingQueue = new ArrayBlockingQueue<>(3);

        //不会抛出异常，会返回false
        System.out.println(arrayBlockingQueue.offer("a"));
        System.out.println(arrayBlockingQueue.offer("b"));
        System.out.println(arrayBlockingQueue.offer("c"));
        System.out.println(arrayBlockingQueue.offer("d"));

        //检测队首元素
        System.out.println(arrayBlockingQueue.peek());

        System.out.println(arrayBlockingQueue.poll());
        System.out.println(arrayBlockingQueue.poll());
        System.out.println(arrayBlockingQueue.poll());
        System.out.println(arrayBlockingQueue.poll());//没有值返回null
    }

    public static void test3() {
        //队列满了后进入阻塞的情况。
        ArrayBlockingQueue arrayBlockingQueue = new ArrayBlockingQueue<>(3);

        try {
            arrayBlockingQueue.put("a");
            arrayBlockingQueue.put("b");
            arrayBlockingQueue.put("c");
//            arrayBlockingQueue.put("d"); 队列没有位置了，一直阻塞

            System.out.println(arrayBlockingQueue.take());
            System.out.println(arrayBlockingQueue.take());
            System.out.println(arrayBlockingQueue.take());
//            System.out.println(arrayBlockingQueue.take()); 没有这个元素，一直等待
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    public static void  test4(){
        //超时等待，
        ArrayBlockingQueue arrayBlockingQueue = new ArrayBlockingQueue<>(3);

        arrayBlockingQueue.offer("a");
        arrayBlockingQueue.offer("b");
        arrayBlockingQueue.offer("c");
        try {
            //如果两秒后没入队列就结束
            arrayBlockingQueue.offer("d",2, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(arrayBlockingQueue.poll());
        System.out.println(arrayBlockingQueue.poll());
        System.out.println(arrayBlockingQueue.poll());
        try {
            //如果两秒后取不到值就结束
            System.out.println(arrayBlockingQueue.poll(2,TimeUnit.SECONDS));
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }