How can I create "static" method for enum in Kotlin?

Question

Kotlin already have number of "static" methods for enum class, like values and valueOf

For example I have enum

public enum class CircleType {
    FIRST
    SECOND
    THIRD
}

How can I add static method such as random(): CircleType? Extension functions seems not for this case.

Steffen Funke · Accepted Answer · 2015-12-05 14:41:41Z

248

Just like with any other class, you can define a class object in an enum class:

enum class CircleType {
  FIRST,
  SECOND,
  THIRD;
  companion object {
     fun random(): CircleType = FIRST // http://dilbert.com/strip/2001-10-25
  }
}

Then you'll be able to call this function as CircleType.random().

EDIT: Note the commas between the enum constant entries, and the closing semicolon before the companion object. Both are now mandatory.

edited Dec 5, 2015 at 14:41

Steffen Funke

2,5081 gold badge23 silver badges20 bronze badges

answered Feb 26, 2015 at 22:01

yole

98.1k21 gold badges279 silver badges205 bronze badges

Sign up to request clarification or add additional context in comments.

13 Comments

Ilya Ryzhenkov Over a year ago

If you want it to be visible from Java as a static method, you need to annotate it with [platformStatic] as well.

Kishan B Over a year ago

Now you need to use @JvmStatic kotlinlang.org/docs/reference/…

HendraWD Over a year ago

Use @JvmStatic if only you really want to use with Java, otherwise it's just waste of resources

yole Over a year ago

The Companion reference is only needed if you're accessing the method from Java code, not from Kotlin.

HendraWD Over a year ago

@SiamakSiaSoft yes I agree, that's why I wrote: Use @JvmStatic if only you really want to use with Java

|

Collectives™ on Stack Overflow

How can I create "static" method for enum in Kotlin?

1 Answer 1

13 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

13 Comments

Your Answer

Sign up or log in

Post as a guest

Related