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Questions and Answers
What is the primary purpose of providing a meaningful question stem?
What is the primary purpose of providing a meaningful question stem?
What should distractors in multiple choice questions represent?
What should distractors in multiple choice questions represent?
Which of the following is not a recommended practice when constructing answer options?
Which of the following is not a recommended practice when constructing answer options?
Which aspect of the question construction is emphasized in the provided guidelines?
Which aspect of the question construction is emphasized in the provided guidelines?
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What is an important characteristic of the correct answer in a multiple choice question?
What is an important characteristic of the correct answer in a multiple choice question?
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Which of the following is NOT a core principle of Object-Oriented Programming?
Which of the following is NOT a core principle of Object-Oriented Programming?
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What is encapsulation in Object-Oriented Programming?
What is encapsulation in Object-Oriented Programming?
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What keywords are used to indicate base and derived classes in C#?
What keywords are used to indicate base and derived classes in C#?
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Polymorphism allows treating objects of derived classes as objects of their base class.
Polymorphism allows treating objects of derived classes as objects of their base class.
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What is an abstract class?
What is an abstract class?
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Which access modifier makes a member accessible only within the class itself?
Which access modifier makes a member accessible only within the class itself?
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What is a constructor in C#?
What is a constructor in C#?
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A destructor is commonly used in C# due to garbage collection.
A destructor is commonly used in C# due to garbage collection.
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What are interfaces used for in C#?
What are interfaces used for in C#?
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What is the purpose of static members in a class?
What is the purpose of static members in a class?
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What differentiates value types from reference types in C#?
What differentiates value types from reference types in C#?
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Study Notes
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Core Principles of Object-Oriented Programming (OOP)
-
Encapsulation: Bundles data and methods together, controlling access with modifiers like
public
,private
, andprotected
. -
Inheritance: Creates new classes based on existing ones, promoting code reusability. Achieved using
base
andderived
class keywords. - Polymorphism: Treats objects of different classes derived from the same base class as objects of that base class. Implemented through method overriding and interfaces.
- Abstraction: Represents essential features of complex objects, simplifying development. Achieved with abstract classes and interfaces.
Classes and Objects
- Class: A blueprint defining the structure and behavior of objects with properties and methods.
-
Object: An instance of a class, created using the
new
keyword.
Access Modifiers
- Public: Access from anywhere.
- Private: Access only within the class.
- Protected: Access within the class and its derived classes.
- Internal: Access within the same assembly.
Constructors and Destructors
- Constructor: A special method used to initialize object fields when it is created.
- Destructor: Used for cleanup when an object is no longer needed (less common in C# due to garbage collection).
Interfaces
- Contracts that classes must adhere to, providing a blueprint.
- Contain only method signatures, not implementations.
- Support multiple inheritance.
Abstract Classes
- Cannot be instantiated directly, only meant for subclassing.
- Can contain abstract methods (without bodies) and concrete methods (with bodies).
Method Overriding and Overloading
-
Overriding: Redefining a base class method in a derived class using the
override
keyword. - Overloading: Creating multiple methods with the same name but different parameters in the same class.
Static Members
- Declared with the
static
keyword, belonging to the class rather than an instance. - Useful for data or methods shared by all instances.
Value vs. Reference Types
-
Value Types: Store data directly (e.g.,
int
,struct
). -
Reference Types: Store references to the actual data (e.g.,
object
,class
,string
).
Common OOP Use Cases in C#
- Creating complex data models.
- Implementing design patterns for structure and organization.
- Building maintainable and scalable applications.
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