So to make a nested class be an 'inner' class, it must be specified as inner class.So you want to become an Android developer and work from anywhere in the world, or maybe even the same place you're currently at, but with much more interesting and well-paying jobs? Learning Android App development is the way to go. In Kotlin, all nested classes are equivalent with public static class in Java. static nested class in Java vs inner class in Kotlin So use internal only where it makes sense. Just make them public instead.ġ.) it has a very strange access from Java code unless you use it doesn't really do anything if your code is not multi-module (because internal restricts visibility to only the current compilation module). I say this because your auto-converter will add internal everywhere. There is NO package visibility in Kotlin. What's important to note is that internal is not the same as package, don't try to use internal as a replacement for package. In Kotlin however, we have the following visibilities: In Java, we have the following visibilities: visibility in Kotlin (public by default, private, protected, internal) Which is honestly hideous, so if you use the auto-converter, beware that it puts this stuff in your code by default instead of the annotations above. String someUglyMutableField = M圜lassWithStatics. So the above code in Kotlin would look like this: It's also important for allowing the creation of extension functions that are accessed as 'static methods' of a given class. This might sound crazy, but this makes sense for example when you need to use the Parceler interface in combination with the annotation using kotlin-android-extensions (to simplify the creation of CREATORs). Now, this might seem crazy, but it has the super-nice benefits that lets you inherit 'static functions' from interfaces into your companion object. Instead, Kotlin introduces the concept of companion objects that store static fields and methods. println( SOME_CONSTANT + ' ' + someUglyMutableField) Public static String someUglyMutableField = 'don't do this like ever' Public static final String SOME_CONSTANT = 'Hello!' With all that in consideration, an interface like this: Vars can have different visibility modifiers, for example a public getter, but private setter. Package guide.to.kotlin abstract class BaseClass.

Internal keyword kotlin