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chap08

Course: CSC 208, Spring 2006
School: Monroe CC
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8 Understanding Chapter Inheritance and Interfaces Object-Oriented Application Development Using VB .NET 1 Objectives In this chapter, you will: Implement the Boat generalization/specialization class hierarchy Understand abstract and final classes and the MustInherit and NotInheritable keywords Override a superclass method Understand private versus protected access Object-Oriented Application Development Using VB .NET 2 Objectives In this chapter, you will: Explore the Lease subclasses and abstract methods Understand and use interfaces Use custom exceptions Understand the Object class and inheritance Object-Oriented Application Development Using VB .NET 3 Implementing the Boat Generalization/Specification Hierarchy Boat class Stores information about a boat's State registration number Length Manufacturer Model year Object-Oriented Application Development Using VB .NET 4 Implementing the Boat Generalization/Specification Hierarchy Boat class Parameterized constructor Accepts values for all four attributes Eight standard accessor methods Four setter methods Four getter methods TellAboutSelf method Object-Oriented Application Development Using VB .NET 5 Testing the Boat Superclass with a Windows Form A Windows application and a Windows form with buttons can be used to test all problem domain classes Windows form testers Accomplish the same objective as a class module To systematically test each problem domain class to demonstrate that all functionality works as intended Object-Oriented Application Development Using VB .NET 6 Using the Inherits Keyword to Create the Sailboat Subclass Generalization/specialization hierarchy Superclass Includes attributes and methods that are common to specialized subclasses Instances of the subclasses Inherit attributes and methods of the superclass Include additional attributes and methods Object-Oriented Application Development Using VB .NET 7 Using the Inherits Keyword to Create the Sailboat Subclass Superclass Boat class Four attributes and eight accessor methods Subclasses Sailboat Three additional attributes Powerboat Two additional attributes Object-Oriented Application Development Using VB .NET 8 Using the Inherits Keyword to Create the Sailboat Subclass Object-Oriented Application Development Using VB .NET 9 Using the Inherits Keyword to Create the Sailboat Subclass Inherits keyword Used in the class header to implement a subclass Indicates which class the new class is extending Example: Class header to define the Sailboat class as a subclass of Boat: Public Class Sailboat Inherits Boat Object-Oriented Application Development Using VB .NET 10 Using the Inherits Keyword to Create the Sailboat Subclass Class definition of a subclass Includes any attributes and methods in addition to those inherited from the superclass Sailboat constructor Accepts seven parameters Four for attributes defined in the Boat superclass Three for additional attributes defined in Sailboat Object-Oriented Application Development Using VB .NET 11 Using the Inherits Keyword to Create the Sailboat Subclass Sailboat constructor MyBase.New call Used to set attributes for registration number, length, manufacturer, and year Invokes constructor of the superclass Must be the first statement in the constructor Required unless the superclass includes a default constructor without parameters Sailboat set accessor methods Used to set the three remaining attribute values Object-Oriented Application Development Using VB .NET 12 Adding a Second Subclass Powerboat Powerboat class Extends the Boat class Declares two attributes: numberEngines fuelType Constructor expects six parameters Four required by Boat Two additional attributes for Powerboat Object-Oriented Application Development Using VB .NET 13 Adding a Second Subclass Powerboat Once the boats are created Four getter methods inherited from Boat Can be invoked for both sailboats and powerboats Three additional getter methods of Sailboat Not present in powerboats Two additional getter methods of Powerboats Not present in sailboats Object-Oriented Application Development Using VB .NET 14 Understanding Abstract and Final Classes Concrete classes Classes that can be instantiated Examples Sailboat class Powerboat class Object-Oriented Application Development Using VB .NET 15 Using the MustInherit Keyword Abstract class Not intended to be instantiated Only used to extend into subclasses Used to facilitate reuse MustInherit keyword Used in class header to declare an abstract class Example: Class header to make the Boat class abstract: Public MustInherit Class Boat Object-Oriented Application Development Using VB .NET 16 Using the NotInheritable Keyword A Final class A class that cannot be extended Created for security purposes or efficiency Created using the NotInheritable keyword Example Class header for the Powerboat class : Public NotInheritable Class Powerboat Inherits Boat Object-Oriented Application Development Using VB .NET 17 Overriding a Superclass Method Method overriding Method in subclass will be invoked instead of method in the superclass if both methods have the same signature Allows the subclass to modify the behavior of the superclass Object-Oriented Application Development Using VB .NET 18 Overriding a Superclass Method Method overriding vs. method overloading Overloading Two or more methods in the same class have the same name but a different return type or parameter list Overriding Methods in both the superclass and subclass have the same signature Object-Oriented Application Development Using VB .NET 19 Overriding the Boat TellAboutSelf Method TellAboutSelf method Demonstrates method overriding Used to make it easier to get information about an instance of the class Overridable keyword Included in method header to make a method overridable Object-Oriented Application Development Using VB .NET 20 Overriding the Boat TellAboutSelf Method To override the TellAboutSelf method Use the same method signature in the subclass, except for using Overrides keyword in place of Overridable keyword Once a method is overriden Statements in the subclass method control what system does when a sailboat instance is asked to tell about itself Method in Boat is ignored Object-Oriented Application Development Using VB .NET 21 Overriding and Invoking a Superclass Method Sometimes the programmer needs to override a method by extending what the method does For example Powerboat TellAboutSelf method invokes the superclass method using MyBase keyword Superclass method name Object-Oriented Application Development Using VB .NET 22 Overriding, Polymorphism, and Dynamic Binding Polymorphism Objects of different classes can respond to the same message in their own way Dynamic binding Used to resolve which method to invoke when the system runs and finds more than one method with the same name Provides flexibility when adding new subclasses that override superclass methods Object-Oriented Application Development Using VB .NET 23 Understanding Private Versus Protected Access Declaring attributes as private Done by using Private keyword No other object can read directly or modify the values Other objects must use methods of the class to get or set values Ensures encapsulation and information hiding Limits the ability of an instance of a subclass to directly access attributes defined by the superclass Object-Oriented Application Development Using VB .NET 24 Understanding Private Versus Protected Access Declaring attributes as Protected Done by using Protected keyword Values can be directly accessed by subclasses Local variable Accessible only to statements within a method where it is declared Exists only as long as the method is executing Does not need to be declared as private, protected, friend, or public Object-Oriented Application Development Using VB .NET 25 Understanding Private Versus Protected Access Methods Private methods Can only be invoked from a method within the class Private methods Cannot be invoked even by subclass methods Protected methods Can be invoked by a method in a subclass Object-Oriented Application Development Using VB .NET 26 Introducing the Lease Subclasses and Abstract Methods Lease class Subclasses AnnualLease DailyLease Attributes Amount: a numeric value Start date: a reference variable End date : a reference variable Defined as abstract Includes MustInherit keyword in header Object-Oriented Application Development Using VB .NET 27 Introducing the Lease Subclasses and Abstract Methods Object-Oriented Application Development Using VB .NET 28 Introducing the Lease Subclasses and Abstract Methods Lease class constructor Accepts one parameter A reference to a DateTime instance for start date of the lease Sets end date to Nothing Sets amount of the lease to zero Subclasses set end date and calculate amount depending on type of the lease Object-Oriented Application Development Using VB .NET 29 Adding an Abstract Method to Lease Sometimes it is desirable to require all subclasses to include a method All Lease subclasses need a CalculateFee method Subclasses are responsible for determining what the lease amount will be Necessary for polymorphism Object-Oriented Application Development Using VB .NET 30 Adding an Abstract Method to Lease Abstract method A method without any statements that must be overridden by all subclasses Declared by using MustOverride keyword in method header For example CalculateFee method of the Lease class Object-Oriented Application Development Using VB .NET 31 Implementing the AnnualLease Subclass AnnualLease subclass attributes balanceDue The amount of the annual lease that remains unpaid payMonthly A Boolean Indicates whether monthly payments will be made for the annual lease Object-Oriented Application Development Using VB .NET 32 Implementing the AnnualLease Subclass If payMonthly is true balanceDue is initially set to eleven-twelfths of the lease amount If payMonthly is false balanceDue will be zero Object-Oriented Application Development Using VB .NET 33 Implementing the DailyLease Subclass DailyLease A subclass of the Lease class Used when a customer leases a slip for a short time Additional attribute Number of days of the lease Calculated based on the start date and end date Object-Oriented Application Development Using VB .NET 34 Understanding and Using Interfaces An interface Defines abstract methods and constants that must be implemented by classes that use the interface Can be used to ensure that an instance has a defined set of methods Object-Oriented Application Development Using VB .NET 35 Understanding and Using Interfaces Component-based development Components interact in a system using a welldefined interface Components might be built using a variety of technologies Interfaces Define how components can be used Play an important role in developing componentbased systems Object-Oriented Application Development Using VB .NET 36 Understanding and Using Interfaces A VB .NET class Can inherit from only one superclass Can implement one or more interfaces Interfaces allow VB .NET subclasses a form of multiple inheritance Multiple inheritance Ability to inherit from more than one class A subclass is part of two or more generalization/specialization hierarchies Object-Oriented Application Development Using VB .NET 37 Creating a VB .NET Interface Interface Name (by convention) Begins with a capital letter "I" Uses the word "interface" Header Uses Interface keyword, followed by the interface name Methods Include no code Object-Oriented Application Development Using VB .NET 38 Creating a VB .NET Interface A class can implement an interface by adding the following to the class header: Implements keyword Name of the interface Object-Oriented Application Development Using VB .NET 39 Implementing More Than One Interface To implement more than one interface Use Implements keyword in the class header Separate multiple interface names by commas For example: Public Class DailyLease Inherits Lease Implements ILeaseInterface, ICompanyInterface Object-Oriented Application Development Using VB .NET 40 Using Custom Exceptions NotInheritable keyword Any class that is not declared NotInheritable can be extended Custom exception An exception written specifically for an application An example of extending a built-in class Object-Oriented Application Development Using VB .NET 41 Defining LeasePaymentException LeasePaymentException A custom exception Created by defining a class that extends the Exception class Designed for use by the AnnualLease class Thrown if payment is invalid Object-Oriented Application Development Using VB .NET 42 Throwing a Custom Exception RecordLeasePayment method A custom method Records a payment Expects to receive the amount of the payment Throws a LeasePaymentException instance if payment amount is not valid Object-Oriented Application Development Using VB .NET 43 Understanding the Object Class and Inheritance Object class Extended by all classes in VB .NET Defines basic functionality that other classes need in VB .NET ToString method A method of the Object class Inherited by all classes By default, returns a string representation of the class name Overridden by other classes to provide more specific information Object-Oriented Application Development Using VB .NET 44 Understanding the Object Class and Inheritance Some other methods of the Object class Equals GetHashCode GetType ReferenceEquals The Default New constructor Object-Oriented Application Development Using VB .NET 45 Summary Generalization/specialization hierarchies show superclasses and subclasses The subclass inherits attributes and methods of the superclass An abstract class: a class that is not instantiated; exists only to serve as a superclass A final class: a class that cannot be extended Object-Oriented Application Development Using VB .NET 46 Summary An abstract method in a superclass must be implemented by all the subclasses An interface can be used to require that classes contain specific methods Custom exceptions can provide detailed information following an exception In VB .NET, the Object class is the superclass of all classes Object-Oriented Application Development Using VB .NET 47

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