阻塞队列-生产者消费者思想

BlockingQueue

• 解决线程通信的问题
• 阻塞方法：put、take
  生产者消费者模式
• 生产者：产生数据的线程
• 消费者：使用数据的线程
  实现类
• ArrayBlockingQueue
• LinkedBlockingQueue
• PriorityBlockingQueue、SynchronousQueue等

示例：

public class BlockingQueueTests {

    public static void main(String[] args) {
        BlockingQueue queue = new ArrayBlockingQueue(10);
        new Thread(new Producer(queue)).start();
        new Thread(new Consumer(queue)).start();
        new Thread(new Consumer(queue)).start();
        new Thread(new Consumer(queue)).start();
    }

}

class Producer implements Runnable {

    private BlockingQueue<Integer> queue;

    public Producer(BlockingQueue<Integer> queue) {
        this.queue = queue;
    }

    @Override
    public void run() {
        try {
            for (int i = 0; i < 100; i++) {
                Thread.sleep(20);
                queue.put(i);
                System.out.println(Thread.currentThread().getName() + " 生产了 " + i);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {

        }
    }
}

class Consumer implements Runnable{

    private BlockingQueue<Integer> queue;

    public Consumer(BlockingQueue<Integer> queue) {
        this.queue = queue;
    }

    @Override
    public void run() {
        try {
            for (int i = 0; i < 100; i++) {
                Thread.sleep(new Random().nextInt(1000));
                Integer j = queue.take();
                System.out.println(Thread.currentThread().getName() + " 消费了 " + j);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {

        }
    }
}

结果：