Is there a defined difference between `this::class...

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[eygraber]

Is there a defined difference between this::class.java and javaClass in regards to generics?

If I have this class defined:

class Test<T>(
    val me: Class<T>
)

And I instantiate it like this, it's fine:

fun <T> T.test() {
  Test(javaClass)
}

However, if I instantiate it like this, it won't compile:

fun <T> T.test() {
  Test(this::class.java)
}

And the error is:

Type inference failed. Expected type mismatch:

Required: Test<T>

Found: Test<out T>

[hho]

.javaClass is the equivalent of getClass() in Java.

::class.java is the equivalent of .class in Java.

So what you're trying to do is this.class – and that won't work, just as in Java.