11.1 Introduction
11.2 Polymorphic Video Game
11.3 Demonstrating Polymorphic Behavior
11.4 Abstract Classes and Methods
11.5 Case Study: Payroll System Class Hierarchy 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 Demonstrating Polymorphic Processing, Expression TypeOf...Is, TryCast and Downcasting
11.5.7 Summary of the Allowed Assignments between Base Class and Derived Class Variables
11.6 NotOverridable Methods and NotInheritable 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 (FCL)
11.8 (Optional) Software Engineering Case Study: Incorporating Inheritance and Polymorphism into the ATM System
11.9 Wrap-Up
