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