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 ...

class Cat extends Animal { @Override void emitSound ... In this video, you can follow along while I debug and explain the Java inheritance challenge. Rafael del Nero is a Java Champion and ...

You cannot prevent other developers from extending certain classes. A method might accept a specific type and its subclasses, but you want to restrict usage to a select few implementations of your own ...

class Square extends Rectangle ... It's not good enough to simply use inheritance and apply the rules of polymorphism to your code. To write SOLID code, and properly implement the Liskov substitution ...