CODEWITHSUNDEEP
kotlin
QED
QED

Reputation: 9913

What is the pure Kotlin alternative to 'javaClass'?

I'm implementing a pure Kotlin library that I will be releasing under an open source license. In my library I have, say, class A, in which I want to override equals(). I used Android Studio's auto-generator to do this, but it included a reference to javaClass:

override fun equals(other: Any?): Boolean {
   if (this === other) return true
   if (javaClass != other?.javaClass) return false
   other as A
   ...
}

Is this reference safe to use in a pure Kotlin library? What will be the effect if somebody used my library to target, say, JavaScript? Is there a pure-Kotlin alternative to javaClass? I'd like to avoid something like

if (other !is A) ...

because I don't want subclasses of A to register.

Upvotes: 1

Views: 358

Answers (1)

Alexey Soshin
Alexey Soshin

Reputation: 17701

What you did is not safe. The reason Android Studio generated this code, is because you're not developing a multiplatform project, actually.

Multiplatform version would look like this:

override fun equals(other: Any?): Boolean {
    if (this === other) return true
    if (other == null || this::class != other::class) return false
    return true
}

If your goal is to have a platform-agnostic library, develop it as multiplatform project, and put most of your code under common module.

Upvotes: 4

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