Java: How to write generic function that accepts Enum constants that implement a given interface?

Question

So i have a bunch of enum's that all extend an interface:

public interface MyInterface {}

I then have several enums that extend the interface:

public enum A implements MyInterface {}

public enum B implements MyInterface {}

I want a function that will accept only enum's that extend this interface. I cannot do:

public void MyFunction(MyInterface input)

because, inside the function, I create an EnumSet using EnumSet.of(input). I cannod do

public <T extends Enum<T>> void myFunction(T input)

because, inside the function, I need to create a Map that needs to be passed to another function. So is there any type-safe way to do this w/o casting?

Edit: Corrected interface definitions.

That should be enum A implements MyInterface

Rohit Jain
– Rohit Jain

2014-02-11 16:43:06 +00:00
Commented Feb 11, 2014 at 16:43 — Rohit Jain
– Rohit Jain, Commented Feb 11, 2014 at 16:43

Rohit Jain · Accepted Answer · 2014-02-11 16:40:10Z

13

You can give multiple bounds to your type parameter:

public <T extends Enum<T> & MyInterface> void myFunction(T input)

Note: You're missing return type of the method. I've given void here. Change accordingly. Oh! And please follow Java naming conventions. Method name should start with lowercase letters.

answered Feb 11, 2014 at 16:40

Rohit Jain

214k45 gold badges419 silver badges534 bronze badges

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

Collectives™ on Stack Overflow

Java: How to write generic function that accepts Enum constants that implement a given interface?

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related