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45 lines
1.2 KiB
45 lines
1.2 KiB
/**
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* File: deque.kt
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* Created Time: 2024-01-25
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* Author: curtishd (1023632660@qq.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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/* Driver Code */
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fun main() {
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/* 初始化双向队列 */
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val deque = LinkedList<Int>()
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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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println("双向队列 deque = $deque")
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/* 访问元素 */
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val peekFirst = deque.peekFirst()
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println("队首元素 peekFirst = $peekFirst")
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val peekLast = deque.peekLast()
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println("队尾元素 peekLast = $peekLast")
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/* 元素入队 */
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deque.offerLast(4)
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println("元素 4 队尾入队后 deque = $deque")
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deque.offerFirst(1)
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println("元素 1 队首入队后 deque = $deque")
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/* 元素出队 */
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val popLast = deque.pollLast()
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println("队尾出队元素 = $popLast，队尾出队后 deque = $deque")
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val popFirst = deque.pollFirst()
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println("队首出队元素 = $popFirst，队首出队后 deque = $deque")
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/* 获取双向队列的长度 */
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val size = deque.size
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println("双向队列长度 size = $size")
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/* 判断双向队列是否为空 */
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val isEmpty = deque.isEmpty()
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println("双向队列是否为空 = $isEmpty")
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} |