Java线程队列的使用-ArrayBlockingQueue

ArrayBlockingQueue

ArrayBlockingQueue是一种基于数组的有界阻塞队列，它在创建时需要指定容量大小，并且可以选择是否需要公平性。如果公平参数被设置为true，那么线程将会按照FIFO的顺序访问队列；否则，访问顺序是不确定的。

ArrayBlockingQueue可以用于实现固定大小的缓冲区，例如下面的代码创建了一个容量为5的ArrayBlockingQueue，并向其中添加了10个元素。可以看到，当队列满时，插入操作会被阻塞，直到有空闲的位置。

import java.util.concurrent.ArrayBlockingQueue;

public class ArrayBlockingQueueDemo {
    public static void main(String[] args) {
        // 创建一个容量为5的数组阻塞队列
        ArrayBlockingQueue<Integer> abq = new ArrayBlockingQueue<>(5);
        // 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");
                abq.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
// 此时队列已满，插入操作被阻塞，直到有其他线程从队列中获取元素