Java 中 ArrayBlockingQueue contains() 方法
ArrayBlockingQueue 類的 contains() 方法用來搜尋隊列中的元素。如果佇列中存在該元素,則返回 TRUE。
語法如下 −
boolean contains(Object ob)
其中,ob 是要搜尋的元素。
要使用 ArrayBlockingQueue 類,需要匯入以下包 −
import java.util.concurrent.ArrayBlockingQueue;
以下是一個使用 Java ArrayBlockingQueue 類實現 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));
}
}輸出
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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