Understanding interfaces and abstract classes and methods in Java. This Java code challenge demonstrates many important concepts about interfaces, abstract methods, and more.

Bracket vs. brace vs. parenthesis; Proper name: Alternative names: Typical uses: Brace: Curly braces, squiggly braces, chicken lips: Define the start and end of a class, method, loop or code block: ...

Abstract classes can have abstract and regular methods. Abstract methods have a signature with no implementation body. Abstract methods can only be used in abstract classes and are used to specify ...