In Java, nested classes are categorized as either static member ... that returns an instance of this class. Such classes are known as local classes because (as with local variables) they are ...

but every instance of a bank account has a different number. The account ID is constant on a per-account basis, but it's not the same for every account. That's how final variables work. What is a ...

This is because Java is “statically-typed” as opposed ... depending on how they interact with their class (instance variables vs static variables). You won’t need to understand these ...

The static keyword often confuses junior Java developers. A static variable is one that is not attached to an instance, and a static method is one that does not require an instance to be invoked.