The release of Java SE 15 in Sept 2020 will introduce ... subtypes in the generated documentation page for a sealed class.) A hierarchy like Shape gives its clients a choice: they can deal ...

Sealed classes, proposed in JEP 409 and available since Java 17, let developers limit and control how deeply a component's type hierarchy can extend. With sealed classes, a developer can essentially ...

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, and ...