Java线程队列的使用-LinkedBlockingQueue

喜欢ヅ旅行 2023-10-12 23:10 5阅读 0赞

LinkedBlockingQueue是一种基于链表的阻塞队列，它的内部维护了一个数据节点链表。它可以选择指定容量，也可以不指定。如果不指定，默认容量是Integer.MAX\_VALUE，也就是无界队列。它采用分离锁（ReentrantLock）来维护生产者和消费者的同步。

LinkedBlockingQueue可以用于实现无界缓冲区，例如下面的代码创建了一个默认容量的LinkedBlockingQueue，并向其中添加了10个元素。可以看到，插入操作不会被阻塞，因为队列没有容量限制。

import java.util.concurrent.LinkedBlockingQueue;
    
    public class LinkedBlockingQueueDemo {
        public static void main(String[] args) {
            // 创建一个默认容量的链表阻塞队列
            LinkedBlockingQueue<Integer> lbq = new LinkedBlockingQueue<>();
            // 向队列中添加10个元素
            for (int i = 0; i < 10; i++) {
                try {
                    System.out.println("Trying to put " + i + " into queue");
                    lbq.put(i);
                    System.out.println("Successfully put " + i + " into queue");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

输出结果（部分）：

Trying to put 0 into queue
    Successfully put 0 into queue
    Trying to put 1 into queue
    Successfully put 1 into queue
    Trying to put 2 into queue
    Successfully put 2 into queue
    Trying to put 3 into queue
    Successfully put 3 into queue
    Trying to put 4 into queue
    Successfully put 4 into queue
    Trying to put 5 into queue
    Successfully put 5 into queue
    // 此时队列没有满，插入操作不会被阻塞，直到达到Integer.MAX_VALUE的上限