Use Static Method in Java as Extension Method in Kotlin

Question

I have a static method declared in Java:

class X {
    public static void foo(Y y) { … }
}

I would love to use this method as extension method for instances of type Y in Kotlin:

import X.foo
…
y.foo()

Is that possible? I have control over all source code in question, e.g. to add annotations.

Todd · Accepted Answer · 2017-09-09 15:20:31Z

8

I don't know of a way to automatically refer to these, but writing your own extension that just wraps the existing method should be possible...

fun Y.foo() = X.foo(this)

answered Sep 9, 2017 at 15:20

Todd

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3 Comments

Bombe Over a year ago

Yes, that is of course possible but I would like to avoid having to write my own extension method for every static method that could (theoretically) be used as an extension method in Kotlin.

Eugen Pechanec Over a year ago

@Bombe So don't write the static method. Just write the extension method and it will be accessible from Java as a static method.

Bombe Over a year ago

@EugenPechanec it’s all part of porting code from Java to Kotlin. Sooner or later the original method will be gone anyway but in the mean time I’d really like to simply add an annotation and be able to use it from Kotlin as an extension method. :)

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