问题描述
如何将java.util.Map [String，Object]转换为scala.collection.immutable.Map [String，Any]，以便将原始地图中的所有值（整数，布尔等）转换为正确的价值在Scala中运作良好。
How do I convert java.util.Map[String, Object] to scala.collection.immutable.Map[String, Any], so that all values in the original map (integers, booleans etc.) are converted to the right value to work well in Scala.
推荐答案
正如VonC所说， scala.collections.JavaConversion 支持可变集合但是，您不必使用单独的库。可变集合派生自 TraversableOnce ，它定义了返回不可变Map的 toMap 方法：
As VonC says, scala.collections.JavaConversion supports mutable collections only, but you don't have to use a separate library. Mutable collections are derived from TraversableOnce which defines a toMap method that returns an immutable Map:
import scala.collection.JavaConversions._
val m = new java.util.HashMap[String, Object]()
m.put("Foo", java.lang.Boolean.TRUE)
m.put("Bar", java.lang.Integer.valueOf(1))
val m2: Map[String, Any] = m.toMap
println(m2)
这将输出
Map(Foo -> true, Bar -> 1)
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