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47 lines
1.5 KiB
47 lines
1.5 KiB
/**
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* File: deque.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 deque {
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public static void main(String[] args) {
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/* 初始化雙向佇列 */
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Deque<Integer> deque = new LinkedList<>();
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deque.offerLast(3);
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deque.offerLast(2);
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deque.offerLast(5);
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System.out.println("雙向佇列 deque = " + deque);
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/* 訪問元素 */
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int peekFirst = deque.peekFirst();
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System.out.println("佇列首元素 peekFirst = " + peekFirst);
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int peekLast = deque.peekLast();
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System.out.println("佇列尾元素 peekLast = " + peekLast);
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/* 元素入列 */
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deque.offerLast(4);
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System.out.println("元素 4 佇列尾入列後 deque = " + deque);
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deque.offerFirst(1);
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System.out.println("元素 1 佇列首入列後 deque = " + deque);
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/* 元素出列 */
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int popLast = deque.pollLast();
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System.out.println("佇列尾出列元素 = " + popLast + "，佇列尾出列後 deque = " + deque);
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int popFirst = deque.pollFirst();
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System.out.println("佇列首出列元素 = " + popFirst + "，佇列首出列後 deque = " + deque);
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/* 獲取雙向佇列的長度 */
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int size = deque.size();
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System.out.println("雙向佇列長度 size = " + size);
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/* 判斷雙向佇列是否為空 */
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boolean isEmpty = deque.isEmpty();
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System.out.println("雙向佇列是否為空 = " + isEmpty);
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}
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}
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