LinkedBlockingQueue 阻塞问题

Question

当用LinkedBlockingQueue的take()方法获取队列信息时

一旦队列为空，则进入阻塞状态

再往队列里put()元素，take()方法会自动获取新加入元素，还是始终保持阻塞状态？

Answer 1

自动获取，不会阻塞了

Answer 2

如果还是阻塞，这个类还有什么用？

Answer 3

建议看看源码，就知道了，很有好处的

Answer 4

你采纳的答案是错误的。ConcurrentLinkedQueue是不阻塞的，LinkedBlockingQueue是阻塞的。分别给你上代码：如下：import java.util.concurrent.LinkedBlockingQueue;public class TestLinkedBlockingQueue {&nbsp; &nbsp; public static void main(String[] args) {&nbsp; &nbsp; &nbsp; &nbsp; LinkedBlockingQueue<String> queue = new LinkedBlockingQueue<String>();&nbsp; &nbsp; &nbsp; &nbsp; try {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; queue.put("a");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; queue.put("b");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.take());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.take());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.take());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; queue.put("c");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.take());&nbsp; &nbsp; &nbsp; &nbsp; } catch (InterruptedException e) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; e.printStackTrace();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}//输出结果：//a//b但是你再看非阻塞的ConcurrentLinkedQueueimport java.util.concurrent.ConcurrentLinkedQueue;public class TestConcurrentLinkedQueue {&nbsp; &nbsp; public static void main(String[] args) {&nbsp; &nbsp; &nbsp; &nbsp; ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();&nbsp; &nbsp; &nbsp; &nbsp; queue.add("a");&nbsp; &nbsp; &nbsp; &nbsp; queue.add("b");&nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.peek());&nbsp; &nbsp; &nbsp; &nbsp; queue.remove();&nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.peek());&nbsp; &nbsp; &nbsp; &nbsp; queue.remove();&nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.peek());&nbsp; &nbsp; &nbsp; &nbsp; queue.remove();&nbsp; &nbsp; &nbsp; &nbsp; queue.add("c");&nbsp; &nbsp; &nbsp; &nbsp; System.out.println(queue.peek());&nbsp; &nbsp; &nbsp; &nbsp; queue.remove();&nbsp; &nbsp; }}//a//b//null//Exception in thread "main" java.util.NoSuchElementException//&nbsp; &nbsp; at java.util.AbstractQueue.remove(AbstractQueue.java:117)//&nbsp; &nbsp; at TestConcurrentLinkedQueue.main(TestConcurrentLinkedQueue.java:14)