Objectives

In this chapter you’ll learn:

• How inheritance promotes software reusability.

• The notions of superclasses and subclasses.

• To use keyword extends to create a class that inherits attributes and behaviors from another class.

• To use access modifier protected to give subclass methods access to superclass members.

• To access superclass members with super.

• How constructors are used in inheritance hierarchies.

• The methods of class Object, the direct or indirect superclass of all classes in Java.