Java 中 ArrayBlockingQueue contains() 方法
ArrayBlockingQueue 类的 contains() 方法用来搜索队列中的元素。如果队列中存在该元素,则返回 TRUE。
语法如下 −
boolean contains(Object ob)
其中,ob 是要搜索的元素。
要使用 ArrayBlockingQueue 类,需要导入以下包 −
import java.util.concurrent.ArrayBlockingQueue;
以下是一个使用 Java ArrayBlockingQueue 类实现 contains() 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("The head of the queue = "+q.take()); System.out.println("Does the element 400 exist in the queue? = "+q.contains(400)); // adding more elements 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("Does the element 10 exist in the queue? = "+q.contains(10)); } }
输出
ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700] The head of the queue = 200 Does the element 400 exist in the queue? = true ArrayBlockingQueue = [310, 400, 450, 500, 550, 700, 50, 70, 90] The head of the queue = 310 Does the element 10 exist in the queue? = false
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