scala中調用java方法報錯

有一個java方法返回一個對象

public Map<String, String> getFieldTypeMap() {
    ...
}

如今在scala中調用該方法

val fieldTypeMap = someObject.getFieldTypeMap()
val innerSQL = fieldTypeMap.map { case (key: String, value: String) => key.replace(".", "_")}.toStream.sorted.reduce(_ + "," + _)

報錯：

Error:(19, 35) value map is not a member of java.util.Map[String,String]
  val structureSQL = fieldTypeMap.map{ case (key: String, value: String) => key.replace(".", "_")

須要添加：

@Deprecated
import scala.collection.JavaConversions._

須要添加：

import scala.collection.JavaConverters.mapAsScalaMapConverter

而後在使用時用toScala:

val fieldTypeMap = someObject.getFieldTypeMap()
val innerSQL = fieldTypeMap.toScala.map { case (key: String, value: String) => key.replace(".", "_")}.toStream.sorted.reduce(_ + "," + _)