若要获取队列中的元素数,请使用size()
ArrayBlockingQueue类的方法。
语法如下
int size()
要使用ArrayBlockingQueue类,您需要导入以下包
import java.util.concurrent.ArrayBlockingQueue;
以下是实现size()
Java ArrayBlockingQueue类的方法的示例
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("The head of the queue = "+q.take()); System.out.println("Number of elements in the queue = "+q.size()); //添加更多元素 q.add(50); q.add(70); q.add(90); System.out.println("ArrayBlockingQueue = " + q); System.out.println("The head of the queue = "+q.take()); System.out.println("Number of elements in the queue = "+q.size()); } }
输出结果
ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700] The head of the queue = 200 Number of elements in the queue = 6 ArrayBlockingQueue = [310, 400, 450, 500, 550, 700, 50, 70, 90] The head of the queue = 310 Number of elements in the queue = 8