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 ...

In Java, nested classes are categorized as either ... The first example demonstrates an anonymous class extending a base class. Expression new Base() is followed by a pair of brace characters ...

If another developer attempts to extend your parent class and introduce a new object type, a once exhaustive evaluation becomes incomplete and ineffective. Java does enable the option to mark a class ...

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 ...