The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent class, invoke parent class constructors and methods ...

The release of Java SE 15 in Sept 2020 will introduce ... which restricts which other classes or interfaces may extend it. Sealed classes, like enums, capture alternatives in domain models ...

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 ...