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

Although Java prevents a developer from extending more than one class, a simple trick can be used to simulate multiple inheritance.

But there are very few Java syntax checkpoints that limit the potential for inheritance-based, object-oriented corruption. The sealed Java class helps reign in the overzealous and often detrimental ...

This looks like the Liskov substitution principle that Uncle Bob Martin described: Substitute a derived class (Square) for a base class (Rectangle). From the standpoint of the compiler, the above code ...