Java supports class reuse through inheritance and composition. This two-part tutorial teaches you how to use inheritance in your Java programs. What you’ll learn in this Java tutorial ...

If you want to extend the Expr class, you must explicitly add the permits clause. Only a library developer can add that clause. Sealed class rules Sealed classes offer precise control over inheritance ...

Although Java prevents a developer from extending more than one class, a simple trick can be used to simulate multiple inheritance. I have used this technique in both a Swing application and a Web ...