如何在 Scala 中将 Map[Int, Any] 转换为 SortedMap?还是树图? [英] How do I convert a Map[Int, Any] to a SortedMap in Scala? Or a TreeMap?

问题描述

我想将 Map[Int, Any] 转换为 SortedMap 或 TreeMap.有什么简单的方法吗?

I would like to convert a Map[Int, Any] to a SortedMap or a TreeMap. Is there an easy way to do it?

推荐答案

假设您使用的是不可变映射

Assuming you're using immutable maps

val m = Map(1 -> "one")
val t = scala.collection.immutable.TreeMap(m.toArray:_*)

TreeMap 伴随对象的 apply 方法采用重复的映射条目参数(它们是适当参数类型的 Tuple2[_, _] 实例).toArray 生成一个 Array[Tuple2[Int, String]](在这种特殊情况下).: _* 告诉编译器数组的内容将被视为重复参数.

The TreeMap companion object's apply method takes repeated map entry parameters (which are instances of Tuple2[_, _] of the appropriate parameter types). toArray produces an Array[Tuple2[Int, String]] (in this particular case). The : _* tells the compiler that the array's contents are to be treated as repeated parameters.

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