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Kotlin判断一个数组中是否有相同的元素
阅读量:562 次
发布时间:2019-03-09

本文共 935 字,大约阅读时间需要 3 分钟。

1.如果只是需要判断是否包含相同元素而不是要找出相同元素有哪些,直接放在set集合中,然后看set集合和数组长度是否一致即可

fun main() {       val array = arrayOf(1, 7, 2, 4, 9, 2)    val sameSet = mutableSetOf
() for (item in array){ sameSet.add(item) } if (sameSet.size == array.size){ print("没有相同元素!") } else{ print("包含相同元素!") }}

包含相同元素!

2.如果需要找出相同的元素是哪些,有几个?可以把数组元素都放在一个map中,key是元素,value为次数,然后看map中的value次数是否有大于1的,有则包含相同的元素。

fun main() {       val array = arrayOf(1, 7, 2, 4, 9, 2, 1, 8, 1)    val sameMap = mutableMapOf
() for (item in array) { with(sameMap[item]) { if (this == null) { sameMap.put(item, 1) } else { sameMap.put(item, this + 1) } } } for (item in sameMap.entries) { if (item.value > 1) { println("相同元素为${ item.key},出现次数为${ item.value}") } }}

相同元素为1,出现次数为3

相同元素为2,出现次数为2

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