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

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.

Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.

Neither of the two "big" programming languages to come out in the last few years, Java or C#, make use of multiple implementation inheritance, providing only interface inheritance.

This post explains how to use classes in Java to build objects and organize your code. Also learn: constructors, static methods, and more!