what list type which is mutable in kotlin can be used in java?

Question

Having a lib created with kotlin, in it there is a function expected to be overriden by its descendent class, which takes a mutableList (expected to be modified in this function)

protected open fun makeDataForAdapter(itemsList: MutableList<Data>) : List<Data>{
    return itemsList // default behavior
}

the lib is used in a app with java, so the descendent class overrides it:

@Override
protected List<Data> makeDataForAdapter(MutableList<Data> itemsList) {
     ......
}

the compiler complains about "cant resolve the MutableList"

what list type which is mutable in kotlin can be used in java?

List<Data>... Just use Ctrl-I (Cmd-I on Mac), and IntelliJ will allow you to override methods, and will add the necessary code for you. — JB Nizet
– JB Nizet, Commented Aug 21, 2018 at 17:04
Thanks @JB Nizet, clicking Cmd-I on where? I am using AndroidStudio, seems it does not anything? — lannyf
– lannyf, Commented Aug 21, 2018 at 17:21
Sorry, it's Ctrl-O, for Override method, in the Java subclass. — JB Nizet
– JB Nizet, Commented Aug 21, 2018 at 17:22

hotkey · Accepted Answer · 2018-08-21 17:43:50Z

4

The kotlin.List<out T> and kotlin.MutableList<E> are mapped types, which, on the JVM and Android, are both represented by the java.util.List<E> interface.

So you just need to use the Java List<E> type wherever you need to inter-operate with the Kotlin List<out E> or MutableList<E>.

answered Aug 21, 2018 at 17:43

hotkey

149k43 gold badges392 silver badges333 bronze badges

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

Collectives™ on Stack Overflow

what list type which is mutable in kotlin can be used in java?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related