This expression is false. Is there a simple way to...

# getting-started

[Joshua Hansen]

This expression is false. Is there a simple way to check if a class is a boolean class without individually checking both the kotlin and java classes?

Boolean::class.java == java.lang.Boolean::class.java // false

[Gleb Minaev]

You can try checking only equality of FQNs:

public fun testKClassesEquality(c1: KClass<*>, c2: KClass<*>): Boolean = c1.qualifiedName == c2.qualifiedName

But I am not sure this is enough.

[Gleb Minaev]

Ah, sorry. I misread the question. I guess you cannot do anything without manually checking both Kotlin and Java classes FQNs.

[ephemient]

that is basically the difference between Boolean::class.javaPrimitiveType and Boolean::class.javaObjectType

[ephemient]

the separation of primitive and reference types in Java is a bit of an annoyance but if you only use Kotlin classes then they're unified

Boolean::class == java.lang.Boolean::class.java.kotlin

[Joshua Hansen]

Hm. So the syntax java.lang.Boolean::class.java.kotlin lets us go from a Java class to a Kotlin class. But if I'm given a Kotlin class, to convert that to a Java class, I should use .javaPrimitiveType?

[ephemient]

it depends

[ephemient]

a Kotlin Boolean may be represented by a primitive Java boolean or a boxed Java Boolean in different circumstances

[Joshua Hansen]

Fair enough. If I just call Boolean::class.java does that give the boxed type or primitive?

[ephemient]

if you call T::class.java you get the primitive type if it exists and the reference type otherwise

[Joshua Hansen]

Sounds good, thanks