Programming In Visual Basic Chapter 12
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Questions and Answers

What is an abstract class?

  • A base class that can be instantiated
  • A class with overridden methods
  • A base class used strictly for inheritance (correct)
  • A class with no methods

    • What does Abstraction mean in OOP?

    Creating a model of an object to determine characteristics and behaviors.

    Use MustOverride keyword for an __________.

    abstract method

    What are accessor methods?

    <p>Methods that allow class properties to be accessed.</p> Signup and view all the answers

    Using _______ simplifies writing property procedures in VB 2010.

    <p>auto-implemented properties</p> Signup and view all the answers

    What is a base class?

    <p>The original class used to create another class.</p> Signup and view all the answers

    What is a child class?

    <p>An inherited class.</p> Signup and view all the answers

    Defining your new ___ is like creating a new tool for the toolbox.

    <p>class</p> Signup and view all the answers

    What is a constructor?

    <p>Method that executes automatically when an object is instantiated.</p> Signup and view all the answers

    If the class does not have a constructor, the compiler creates an implicit method called the _______.

    <p>default constructor</p> Signup and view all the answers

    What is a destructor?

    <p>Method that executes automatically when an object is destroyed.</p> Signup and view all the answers

    ____ refers to the combination of all properties, methods, and events of an object.

    <p>Encapsulating</p> Signup and view all the answers

    What is garbage collection?

    <p>A feature of the .NET Common Language Runtime that cleans up unused components.</p> Signup and view all the answers

    What is inheritance in OOP?

    <p>The ability to create a new class from an existing class.</p> Signup and view all the answers

    The object that is created based on a class is called ____. An actual occurrence of the class is an ____.

    <p>instance</p> Signup and view all the answers

    What is an instance variable?

    <p>A variable that belongs to an instance of a class.</p> Signup and view all the answers

    The process of creating a new object is called ____. When you create a cookie using a cookie cutter, you __________ an object.

    <p>Instantiate</p> Signup and view all the answers

    What is a multitier application?

    <p>An application that works in multiple layers.</p> Signup and view all the answers

    What does the MustInherit keyword specify?

    <p>That a class can only be used as a base class and cannot be instantiated directly.</p> Signup and view all the answers

    What does the MustOverride keyword indicate?

    <p>A method that can be overridden but has no implementation.</p> Signup and view all the answers

    What is an object in OOP?

    <p>A combination of code and data that can be treated as a unit.</p> Signup and view all the answers

    What is overriding in OOP?

    <p>Having a method in a subclass that has the same signature as a method in its base class.</p> Signup and view all the answers

    What is a parameterized constructor?

    <p>A constructor that requires arguments.</p> Signup and view all the answers

    What is a parent class?

    <p>The original class from which another class is derived.</p> Signup and view all the answers

    What does polymorphism refer to in OOP?

    <p>The ability to take on many shapes or forms.</p> Signup and view all the answers

    The characteristics of the instances of classes are called a ____. You can refer to the _____ of your instances.

    <p>Property</p> Signup and view all the answers

    What is a property procedure?

    <p>A procedure that provides access to the properties of a class.</p> Signup and view all the answers

    What does the Protected keyword specify?

    <p>That the element is accessible only within its own class or derived classes.</p> Signup and view all the answers

    What does the ReadOnly keyword indicate?

    <p>A property that can only be read and not modified.</p> Signup and view all the answers

    What is reusability in OOP?

    <p>A characteristic that allows the functionality from one class to be used in another.</p> Signup and view all the answers

    What is a shared variable?

    <p>A variable that exists for all objects of the class.</p> Signup and view all the answers

    What is a subclass?

    <p>The inherited class.</p> Signup and view all the answers

    What is a superclass?

    <p>The original class used to create another class.</p> Signup and view all the answers

    In a property procedure, the value keyword is used to refer to the incoming value of the property using the SET statement with: SET...ClassVariable = ______.

    <p>VALUE</p> Signup and view all the answers

    What is visual inheritance?

    <p>The feature that allows reusing a form's design for another form.</p> Signup and view all the answers

    What is OOP (Object-oriented programming)?

    <p>The most accepted style of programming.</p> Signup and view all the answers

    What is Visual Basic.Net?

    <p>The first version of VB that is truly object-oriented.</p> Signup and view all the answers

    What is a method in OOP?

    <p>An action or behavior that an object can perform.</p> Signup and view all the answers

    The two steps for creating a new object are to declare a variable for the new object and __________.

    <p>instantiate the object using the NEW keyword</p> Signup and view all the answers

    What is MyBase.New()?

    <p>An expression used to call the Base-Class Constructor.</p> Signup and view all the answers

    What is overloading?

    <p>Having several methods with the same name but different argument lists.</p> Signup and view all the answers

    What are the components of a Three-Tier Application?

    <p>Presentation tier, Business Service Tier, Data Tier.</p> Signup and view all the answers

    To override a method, the original method must be declared as Overridable or MustOverride, and the new method must use the keyword __________.

    <p>Overrides</p> Signup and view all the answers

    What is the Object Browser?

    <p>A tool used to view classes, properties, methods, and events.</p> Signup and view all the answers

    Study Notes

    Object-Oriented Programming Concepts in Visual Basic

    • Abstract Class: A base class intended solely for inheritance, defined with MustInherit. Cannot create instances directly; requires subclasses to override defined methods using MustOverride.

    • Abstraction: Modeling of real-world entities to determine their properties and methods; aids in the planning stages of object-oriented (OO) programs by identifying needed classes.

    • Abstract Method: Declared with the MustOverride keyword, serves as a placeholder for methods that must be implemented in derived classes; contains no functionality on its own.

    • Accessor Methods: Provide a way to access class properties, using GET for retrieving values and SET for updating them.

    • Auto-Implemented Property: Introduced in VB 2010, allows the declaration of class properties without explicitly defining GET or SET procedures; the compiler automatically generates this structure.

    • Base Class: The original class, also known as the superclass or parent class, from which other classes derive.

    • Child Class: The class that inherits from a base class, also referred to as a subclass or derived class.

    • Class Definition: A blueprint for creating objects; defines the structure and behavior but does not create instances itself.

    • Constructor: A special method invoked automatically upon instantiation of an object using NEW. Ideal for initialization tasks; must be defined in every class unless a default constructor suffices.

    • Default Constructor: An implicit constructor generated by the compiler if none are defined; has no parameters.

    • Destructor: Method that executes when an object is destroyed, called Finalize in VB, typically used for cleanup tasks.

    • Encapsulation: Bundling of properties, methods, and events in a single unit to promote data hiding; variables should be declared as Private or Protected.

    • Garbage Collection: A feature of the .NET CLR that automatically cleans up unused objects, freeing memory and resources. It activates any defined Finalize procedures.

    • Inheritance: Mechanism to create new classes based on existing ones, enabling enhancements without altering the original; allows use of base class functionality in derived classes.

    • Instance: A specific occurrence of a class; every object created from the class represents an instance, allowing for multiple objects based on a single class definition.

    • Instance Variable: A variable specific to an instance of a class; each object maintains a separate copy, unlike shared variables.

    • Instantiate: The process of creating a new object from a class; involves declaring a variable and using NEW to initialize it.

    • Multitier Application: Design strategy that separates application functions across multiple layers, enhancing modularity and deployment flexibility.

    • MustInherit & MustOverride: Keywords indicating that a class is abstract and cannot be instantiated directly, and methods that require overriding in derived classes, respectively.

    • Object: An instantiation of a class that combines code and data, capable of generating events and possessing properties and methods.

    • Overriding: A feature allowing subclass methods to have the same name as those in the base class but with distinct implementations.

    • Parameterized Constructor: A constructor requiring arguments, facilitating passing parameters during object creation.

    • Polymorphism: Ability of methods to operate under multiple forms; allows method calls to be made across different classes that implement the same method signatures differently.

    • Property: Characteristics of class instances, can be retrieved or modified, representing attributes like flavor or topping in a cookie object.

    • Property Procedure: Facilitates external access to class properties; includes methods for manipulating property values through SET and GET.

    • Protected Modifier: Limits access to class elements, making them available only within that class or its subclasses.

    • ReadOnly Modifier: Specifies that a property can only be read and not modified, restricting access to its GET procedure.

    • Reusability: One of the primary advantages of OOP, allowing functionalities from one class to be utilized in another, enhancing code efficiency and reducing redundancy.

    • Shared Variable: Declared with the Shared keyword, these variables exist for all instances of a class, unlike instance variables which are unique to each instance.

    • Visual Inheritance: A feature that allows a derived form to inherit design properties from a base form, promoting consistency in UI design.

    • Three-Tier Application Architecture: Divided into:

      • Presentation Tier: User interface components.
      • Business Service Tier: Validation, calculations, and business logic.
      • Data Tier: Handles data storage and retrieval.

    • Steps to Override a Method: Use Overridable or MustOverride in the base class method and Overrides keyword in the derived class method.

    • Object Browser: A tool for exploring classes, properties, methods, and events, useful for understanding system and user-defined classes.

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    Description

    Explore the concepts of object-oriented programming in Visual Basic with this set of flashcards. Learn about essential terms such as abstract classes and abstraction, crucial for understanding inheritance in OOP. Ideal for students looking to reinforce their grasp of advanced programming concepts.

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