Java中的ArrayBlockingQueue poll()方法
poll()Java中的ArrayBlockingQueue类的方法检索并删除此队列的头部,如果此队列为空,则返回null。
语法如下:
E poll()
要使用ArrayBlockingQueue类,您需要导入以下包:
import java.util.concurrent.ArrayBlockingQueue;
以下是实现poll()JavaArrayBlockingQueue类的方法的示例:
示例
import java.util.concurrent.ArrayBlockingQueue;
public class Demo {
public static void main(String[] args) throws InterruptedException {
ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(10);
q.add(200);
q.add(310);
q.add(400);
q.add(450);
q.add(500);
q.add(550);
q.add(700);
System.out.println("ArrayBlockingQueue = " + q);
System.out.println("Head of the queue = "+q.poll());
System.out.println("Head of the queue now = "+q.poll());
System.out.println("ArrayBlockingQueue = " + q);
}
}输出结果
ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700] Head of the queue = 200 Head of the queue now = 310 ArrayBlockingQueue = [400, 450, 500, 550, 700]