在Java切换案例中使用Scala枚举

Question

I have a scala enum:

object EnumX extends Enumeration {
  type EnumX = Value
  val A = Value("a")
  val B = Value("b")
}

Now I want to use these enum in a java class:

fun (String eventType) {
switch (EnumX.withName(eventType)) {
       //Error, Constant value required
       case EnumX.A():
         System.out.println("Event successful");
         break; 
       default: 
         System.out.println("Event unsuccessful"); 
         break;
  }
}

How do I use scala enums in java switch case without any error?

Answer 1

The answer is simple: you can't. You can only use a few things in Java switch , Scala Enumeration s don't compile to any of them.

Unfortunately, best practice for interoperability is simply to write enums in Java even in a Scala project.