Why T::class.java is Class<out Int> in Kotlin?

Question

I define a class,It like this

class ResponseHandler<T : Any>(
    val typeClass: Class<out Int> = T::class.java,
    val start: () -> Unit = {},
    val success: (result: SuccessInfo<T>) -> Unit,
    val complete: () -> Unit = {}){/*...*/}

but why type of [T::class.java] is

   Class<out Int>

What i should do if i want to get the class of T ?

for example:

ResponseHandler<User>(....).typeClass is User,not Int.

Answer 1

There are two ways to get class of generic T :

• Kotlin way: Kotlin reified parameters feature .
• Java way: use extension mechanism like Jackson does in it's TypeRefference class