You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.6 KiB
75 lines
1.6 KiB
/**
|
|
* File: array_stack.kt
|
|
* Created Time: 2024-01-25
|
|
* Author: curtishd (1023632660@qq.com)
|
|
*/
|
|
|
|
package chapter_stack_and_queue
|
|
|
|
/* 基于数组实现的栈 */
|
|
class ArrayStack {
|
|
// 初始化列表（动态数组）
|
|
private val stack = mutableListOf<Int>()
|
|
|
|
/* 获取栈的长度 */
|
|
fun size(): Int {
|
|
return stack.size
|
|
}
|
|
|
|
/* 判断栈是否为空 */
|
|
fun isEmpty(): Boolean {
|
|
return size() == 0
|
|
}
|
|
|
|
/* 入栈 */
|
|
fun push(num: Int) {
|
|
stack.add(num)
|
|
}
|
|
|
|
/* 出栈 */
|
|
fun pop(): Int {
|
|
if (isEmpty()) throw IndexOutOfBoundsException()
|
|
return stack.removeAt(size() - 1)
|
|
}
|
|
|
|
/* 访问栈顶元素 */
|
|
fun peek(): Int {
|
|
if (isEmpty()) throw IndexOutOfBoundsException()
|
|
return stack[size() - 1]
|
|
}
|
|
|
|
/* 将 List 转化为 Array 并返回 */
|
|
fun toArray(): Array<Any> {
|
|
return stack.toTypedArray()
|
|
}
|
|
}
|
|
|
|
/* Driver Code */
|
|
fun main() {
|
|
/* 初始化栈 */
|
|
val stack = ArrayStack()
|
|
|
|
/* 元素入栈 */
|
|
stack.push(1)
|
|
stack.push(3)
|
|
stack.push(2)
|
|
stack.push(5)
|
|
stack.push(4)
|
|
println("栈 stack = ${stack.toArray().contentToString()}")
|
|
|
|
/* 访问栈顶元素 */
|
|
val peek = stack.peek()
|
|
println("栈顶元素 peek = $peek")
|
|
|
|
/* 元素出栈 */
|
|
val pop = stack.pop()
|
|
println("出栈元素 pop = $pop，出栈后 stack = ${stack.toArray().contentToString()}")
|
|
|
|
/* 获取栈的长度 */
|
|
val size = stack.size()
|
|
println("栈的长度 size = $size")
|
|
|
|
/* 判断是否为空 */
|
|
val isEmpty = stack.isEmpty()
|
|
println("栈是否为空 = $isEmpty")
|
|
} |