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Object-oriented Programming in C# Specialization, Extension, and Inheritance * Specialization of Classes Specialization of Classes The extension of class specialization Example: Bank Accounts Example: Bank Accounts in C# Example: Geometric Shapes Specialization of classes The Principle of Substitution * Extension of Classes Extension of Classes An example of simple extension The intension of class extensions * Inheritance in General Inheritance Interfaces to clients and subclasses Visibility and Inheritance Class hierarchies and Inheritance Multiple inheritance Problems with multiple inheritance * Inheritance in C# Class Inheritance in C# The top of the class hierarchy Methods in the class Object in C# Inheritance and Constructors Constructors and initialization order Constructors and initialization order: Example Visibility modifiers in C# Inheritance of methods, properties, and indexers Inheritance of methods: Example. Overriding and Hiding in C# Polymorphism. Static and dynamic types Static and dynamic types in C# Type test and type conversion in C# Examples of type test and type conversion Virtual methods in C# Practical use of virtual methods in C# Overriding the Equals method in a class Upcasting and downcasting in C# Upcasting and downcasting in C# Inheritance and Variables

Class B is a subclass of class A

General problems The name clash problem: Does x in C refer to the x in A or the x in B? The combination problem: Can x in A and x in B combined to a single x in C? The selection problem: Do we have means in C to select either x in A or x in B? The replication problem: Is there one or two x pieces in C?