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38 lines
844 B
38 lines
844 B
/**
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* File: queue.dart
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* Created Time: 2023-03-28
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* Author: liuyuxin (gvenusleo@gmail.com)
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*/
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import 'dart:collection';
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void main() {
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/* 初始化队列 */
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// 在 Dart 中，一般将双向队列类 Queue 看作队列使用
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final Queue<int> queue = Queue();
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/* 元素入队 */
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queue.add(1);
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queue.add(3);
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queue.add(2);
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queue.add(5);
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queue.add(4);
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print("队列 queue = $queue");
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/* 访问队首元素 */
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final int peek = queue.first;
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print("队首元素 peek = $peek");
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/* 元素出队 */
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final int pop = queue.removeFirst();
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print("出队元素 pop = $pop ，出队后 queue = $queue");
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/* 获取队列长度 */
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final int size = queue.length;
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print("队列长度 size = $size");
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/* 判断队列是否为空 */
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final bool isEmpty = queue.isEmpty;
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print("队列是否为空 = $isEmpty");
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}
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