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

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

The reason why global constants in Java use the static and final keywords is because final ensures a variable cannot change, while static ensures only one copy of the constant variable is placed in ...

This post explains how to use if statements in Java. Discover why flow control is so important, and how to use advanced keywords like "and" and "else." ...