the corner office : tech blog

a tech blog, by Colin Pretorius

Kotlin Properties

A minor Kotlin annoyance. If you have a Java class with a public final field, such that you just reference it as, then it'd be nice for a Kotlin equivalent to be accessible in the same way.

Problem is, Kotlin/Java interop converts that to Java Bean style, so a Kotlin has to be accessed as foo.getBar() from Java code. I was tearing my hear out wondering why the compiler thought the field I was accessing had 'private access' when it so obviously didn't.

Upshot: cue some editing when converting Java classes to Kotlin.

Probably not a huge issue for most 'idiomatic' Java, but I've long been a fan of exposing immutable fields for struct-ish types this way (subject to usual public API caveats etc; it's trivially easy for internal-only code to be refactored into method accessors if you ever need it, and in the meantime, you have cleaner code, cf. any language which supports properties).

{2017.09.14 18:35}

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