(See Effective Java, "Prefer interfaces to abstract classes".) With sealed interfaces, library authors no longer have to choose between using polymorphism as an implementation technique, permitting ...

Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs. Abstract classes and ...

Though type is an extremely important object-oriented concept, it is often overlooked in favor of implementation-centric concerns. Java program development is as much about design as about ...