Use Java's extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, ... Calling superclass methods from subclass methods.

A subclass is defined with the extends keyword. For example, the syntax ClassB extends ClassA establishes ClassB as a subclass of of ClassA. Java only supports single inheritance, meaning a subclass ...

So now Dog has two methods, eat() that is inherited from Animal and bark() that is specific to the Dog class.Animal still has one method, inheritance only works from the superclasses to the subclasses ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...