转换数组<字符串>到 ArrayList<String> [英] Convert Array<String> to ArrayList<String>
本文介绍了转换数组<字符串>到 ArrayList<String>的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在 Kotlin 中将 Array
转换为 ArrayList
?
How do I convert Array<String>
to ArrayList<String>
in Kotlin?
var categoryList : ArrayList<String>?=null
val list = arrayOf("None", "ABC")
categoryList = ArrayList(Arrays.asList(list))
我收到此错误:
错误
Type inference failed. Expected type mismatch: inferred type is kotlin.collections.ArrayList<Array<String>!> /* = java.util.ArrayList<Array<String>!> */ but kotlin.collections.ArrayList<String>? /* = java.util.ArrayList<String>? */ was expected
推荐答案
您可能对 toCollection
将元素添加到您传递的任何集合中:
You may be interested in toCollection
to add the elements to any collection you pass:
categoryList = list.toCollection(ArrayList())
请注意,要解决您的具体问题,您只需要 扩展运算符 (*
).应用 *
-fix 后,它也会起作用:
Note that to fix your specific problem you just need the spread operator (*
). With the *
-fix applied it would have worked too:
categoryList = ArrayList(Arrays.asList(*list))
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