mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 16:36:29 +08:00
40 lines
1 KiB
Java
40 lines
1 KiB
Java
/**
|
|
* File: queue.java
|
|
* Created Time: 2022-11-25
|
|
* Author: Krahets (krahets@163.com)
|
|
*/
|
|
|
|
package chapter_stack_and_queue;
|
|
|
|
import java.util.*;
|
|
|
|
public class queue {
|
|
public static void main(String[] args) {
|
|
/* 初始化队列 */
|
|
Queue<Integer> queue = new LinkedList<>();
|
|
|
|
/* 元素入队 */
|
|
queue.offer(1);
|
|
queue.offer(3);
|
|
queue.offer(2);
|
|
queue.offer(5);
|
|
queue.offer(4);
|
|
System.out.println("队列 queue = " + queue);
|
|
|
|
/* 访问队首元素 */
|
|
int peek = queue.peek();
|
|
System.out.println("队首元素 peek = " + peek);
|
|
|
|
/* 元素出队 */
|
|
int poll = queue.poll();
|
|
System.out.println("出队元素 poll = " + poll + "，出队后 queue = " + queue);
|
|
|
|
/* 获取队列的长度 */
|
|
int size = queue.size();
|
|
System.out.println("队列长度 size = " + size);
|
|
|
|
/* 判断队列是否为空 */
|
|
boolean isEmpty = queue.isEmpty();
|
|
System.out.println("队列是否为空 = " + isEmpty);
|
|
}
|
|
}
|