scala - 在 Scala concurrent.Map 中混合的最佳实践

Question

ScalaDoc关于 concurrentMap 的说法是:“已弃用(自 2.10.0 版起)请改用 scala.collection.concurrent.Map。”不幸的是，rest of the Scala docs尚未更新，仍然引用 concurrentMap .

我试图混入concurrent.Map变成 HashMap ，结果如下:

scala> val mmap = new mutable.HashMap[String, String] with collection.concurrent.Map[String, String]
<console>:16: error: object creation impossible, since:
it has 4 unimplemented members.
/** As seen from anonymous class $anon, the missing signatures are as follows.
 *  For convenience, these are usable as stub implementations.
 */
  def putIfAbsent(k: String,v: String): Option[String] = ???
  def remove(k: String,v: String): Boolean = ???
  def replace(k: String,v: String): Option[String] = ???
  def replace(k: String,oldvalue: String,newvalue: String): Boolean = ???

       val mmap = new mutable.HashMap[String, String] with collection.concurrent.Map[String, String]

所以我们看到，除了简单的 mixin，还必须实现一些方法。这是最好的使用方式吗concurrent.Map ， 或者，还有更好的方法？

Answer 1

直接取自此评论:
https://stackoverflow.com/a/49689669/7082628

在 2018 年，显然你可以这样做:

import java.util.concurrent.ConcurrentHashMap

val m: ConcurrentHashMap[String,MyClass] = new ConcurrentHashMap