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41 lines
1.0 KiB
41 lines
1.0 KiB
/**
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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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/* 初始化佇列 */
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Queue<Integer> queue = new LinkedList<>();
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/* 元素入列 */
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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("佇列 queue = " + queue);
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/* 訪問佇列首元素 */
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int peek = queue.peek();
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System.out.println("佇列首元素 peek = " + peek);
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/* 元素出列 */
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int pop = queue.poll();
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System.out.println("出列元素 pop = " + pop + "，出列後 queue = " + queue);
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/* 獲取佇列的長度 */
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int size = queue.size();
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System.out.println("佇列長度 size = " + size);
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/* 判斷佇列是否為空 */
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boolean isEmpty = queue.isEmpty();
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System.out.println("佇列是否為空 = " + isEmpty);
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}
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}
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