9  Classes and Objects: A Deeper Look

9.1 Introduction

9.2 Time Class Case Study

9.3 Controlling Access to Members

9.4 Referring to the Current Object's Members with the this Reference

9.5 Indexers

9.6 Time Class Case Study: Overloaded Constructors

9.7 Default and Parameterless Constructors

9.8 Composition

9.9 Garbage Collection and Destructors

9.10 static Class Members

9.11 readonly Instance Variables

9.12 Software Reusability

9.13 Data Abstraction and Encapsulation

9.14 Time Class Case Study: Creating Class Libraries

9.15 internal Access

9.16 Class View and Object Browser

9.17 (Optional) Software Engineering Case Study: Starting to Program the Classes of the ATM System

9.18 Wrap-Up

10 Object-Oriented Programming: Inheritance

10.1 Introduction

10.2 Base Classes and Derived Classes

10.3 protected Members

10.4 Relationship between Base Classes and Derived Classes

10.4.1 Creating and Using a CommissionEmployee Class

10.4.2 Creating a BasePlusCommissionEmployee Class without Using Inheritance

10.4.3 Creating a CommissionEmployee-BasePlusCommissionEmployee Inheritance Hierarchy

10.4.4 CommissionEmployee-BasePlusCommissionEmployee Inheritance Hierarchy Using protected Instance Variables

10.4.5 CommissionEmployee-BasePlusCommissionEmployee Inheritance Hierarchy Using private Instance Variables

10.5 Constructors in Derived Classes

10.6 Software Engineering with Inheritance

10.7 Class object

10.8 Wrap-Up

11 Polymorphism, Interfaces & Operator Overloading

11.1 Introduction

11.2 Polymorphism Examples

11.3 Demonstrating Polymorphic Behavior

11.4 Abstract Classes and Methods

11.5 Case Study: Payroll System Using Polymorphism

11.5.1 Creating Abstract Base Class Employee

11.5.2 Creating Concrete Derived Class SalariedEmployee

11.5.3 Creating Concrete Derived Class HourlyEmployee

11.5.4 Creating Concrete Derived Class CommissionEmployee

11.5.5 Creating Indirect Concrete Derived Class BasePlusCommissionEmployee

11.5.6 Polymorphic Processing, Operator is and Downcasting

11.5.7 Summary of the Allowed Assignments Between Base Class and Derived Class Variables

11.6 sealed Methods and Classes

11.7 Case Study: Creating and Using Interfaces

11.7.1 Developing an IPayable Hierarchy

11.7.2 Declaring Interface IPayable

11.7.3 Creating Class Invoice

11.7.4 Modifying Class Employee to Implement Interface IPayable

11.7.5 Modifying Class SalariedEmployee for Use in the IPayable Hierarchy

11.7.6 Using Interface IPayable to Process Invoices and Employees Polymorphically

11.7.7 Common Interfaces of the .NET Framework Class Library

11.8 Operator Overloading

11.9 (Optional) Software Engineering Case Study: Incorporating Inheritance and Polymorphism into the ATM System

11.10 Wrap-Up

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