This is an example of Java inheritance with method overriding. First, ... The difference between a class and an interface, in this case, is that interfaces don’t keep state.

For an introduction to Java interfaces, including the difference between classes and interfaces, see my Java 101 tutorial Working with interfaces in Java. Nesting interfaces in classes Java lets ...

Kotlin vs Java, the latter offers more succinct code – with no findViewByIds. If you compare a Kotlin class and a Java class that are performing the same work, then the Kotlin class will ...