Data Structures and Algorithms in Java, 6th Edition

Chapter 2

Object-Oriented Design

Contents

2.1 Goals, Principles, and Patterns

2.1.1 Object-Oriented Design Goals

2.1.2 Object-Oriented Design Principles

2.1.3 Design Patterns

2.2 Inheritance

2.2.1 Extending the CreditCard Class

2.2.2 Polymorphism and Dynamic Dispatch

2.2.3 Inheritance Hierarchies

2.3 Interfaces and Abstract Classes

2.3.1 Interfaces in Java

2.3.2 Multiple Inheritance for Interfaces

2.3.3 Abstract Classes

2.4 Exceptions

2.4.1 Catching Exceptions

2.4.2 Throwing Exceptions

2.4.3 Java's Exception Hierarchy

2.5 Casting and Generics

2.5.1 Casting

2.5.2 Generics

2.6 Nested Classes

2.7 Exercises

2.1 Goals, Principles, and Patterns

As the name implies, the main “actors” in the object-oriented paradigm are called objects. Each object is an instance of a class. Each class presents to the outside world a concise and consistent view of the objects that are instances of this class, without going into too much unnecessary detail or giving others access to the inner workings of the objects. The class definition typically specifies the data fields, also known as instance variables, that an object contains, as well as the methods (operations) that an object can execute. This view of computing fulfill several goals and incorporates design principles, which we will discuss in this chapter.

2.1.1 Object-Oriented Design Goals

Software implementations should achieve robustness, adaptability ...