Static Inner Class in Kotlin

Inner class (holding reference to outer object)

Java:

class A {
    class B {
    ...
    }
}

Kotlin:

class A {
    inner class B {
    ...
    }
}

Static inner class aka nested class (no reference to outer object)

Java:

class A {
    static class B {
    ...
    }
}

Kotlin:

class A {
    class B {
    ...
    }
}