Java How to Program, Early Objects, 11th Edition

9 Object-Oriented Programming: Inheritance

Objectives

In this chapter you’ll:

• Understand inheritance and how to use it to develop new classes based on existing classes.

• Learn the notions of superclasses and subclasses and the relationship between them.

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

• Use access modifier protected in a superclass to give subclass methods access to these superclass members.

• Access superclass members with super from a subclass.

• Learn how constructors are used in inheritance hierarchies.

• Learn about the methods of class Object, the direct or indirect superclass of all classes.

Outline

1. 9.1 Introduction

2. 9.2 Superclasses and Subclasses

3. 9.3 protected