Use Java's extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, override methods, and more.

Rules for Record classes Now that we understand the benefits of using records, let's learn some rules about what we can and cannot do with them. 1. No 'extends' clause, implicitly extends ...

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.