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Questions and Answers
What term describes when a derived class provides a specific implementation of a method already defined in its base class?
Which type of method cannot be overridden when inherited?
In the context of extension methods, what must the first parameter specify?
Which access modifier allows access to members only from the class itself and not from derived classes?
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What method type is typically used to provide a mechanism for different implementations in derived classes?
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What must a virtual method not be classified as?
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Which method allows extending existing types with additional functionality without changing their source code?
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Which method is defined in a static class that cannot be instantiated?
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What is a key purpose of using the params keyword in method definitions?
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Which of the following statements about method overloading is correct?
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Which of the following scenarios would most likely throw an ArgumentException?
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Which statement is true regarding method parameters when using the ref or out modifier?
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Why can't the following method definitions coexist: public static int Min(int[] paramList) and public static int Min(params int[] paramList)?
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In the context of inheritance, which of these options captures what method overriding allows?
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Garbage collection primarily handles which of the following?
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What will happen if a method is defined to take multiple value types, but is called with a reference type?
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What is the main purpose of inheritance in object-oriented programming?
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In C#, what happens if a derived class does not call a base-class constructor?
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Which keyword is used in C# to explicitly call a base-class constructor?
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Which of the following statements is correct regarding destructors in C#?
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Which of the following types can inherit from a class in C#?
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What is the function of garbage collection in C#?
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What is a characteristic of method overriding in C#?
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Which class is the root of all classes in C#?
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Study Notes
Object-Oriented Programming Concepts
- A method in a derived class that has the same signature as a base class method hides the base method.
- A method intended to be overridden is referred to as a virtual method.
- Overriding is the mechanism that allows derived classes to provide different implementations of the same method.
- A virtual method cannot be private; it must be accessible to allow overriding.
- The signature of virtual and override methods must match exactly in both name and parameters.
Access Modifiers
- The
protected
access modifier allows access to class members from the class itself and derived classes. - To extend a type quickly without impacting existing code, utilize extension methods.
- Extension methods are defined in a static class and allow adding static methods to existing types.
- The first parameter of an extension method must specify the type to which the method applies.
Interfaces and Abstract Classes
- An interface does not contain any implementation; it specifies the methods and properties that implementing classes must fulfill.
- Interfaces provide a way to separate method signatures from their implementations.
- Both interfaces and abstract classes share similarities in defining methods that must be implemented.
Inheritance
- Inheritance helps avoid code repetition by allowing classes with common features to relate through a parent-child relationship.
- In C#, inheritance is a relationship between classes and can only apply to classes, not structures.
- Use the
class DerivedClass : BaseClass {...}
syntax for defining derived classes in C#. - C# inheritance is always implicitly public, meaning it allows access unless specified otherwise.
Constructors and Base Class Calls
- Initialization of fields within a class is performed in a constructor.
- The
base
keyword is used to call a base class constructor in derived classes. - If a derived class does not explicitly call a base class constructor, the compiler automatically calls the base class’s default constructor.
Method Overloading and Variadic Methods
- Overloading occurs when multiple methods share the same name but differ in parameters.
- A variadic method accepts a variable number of arguments, allowing for flexible method calls.
- The
ArgumentException
class is used to handle illegal arguments supplied to methods. - The
params
keyword cannot be used with multidimensional arrays, and overloads cannot solely rely on theparams
keyword.
Method Calls and Validations
- Specifying the
ref
orout
modifier with params arrays is not allowed. - Methods cannot share the same name and differ only by using the
params
keyword in different contexts if combined withref
orout
. - Valid calls to a method with params include multiple argument entries, but using unsupported types or formats may lead to compilation errors.
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Description
Test your knowledge on the concepts of inheritance and polymorphism in Object-Oriented Programming. This quiz covers method overriding, hiding, and the usage of virtual methods in class design. Perfect for students learning about OOP principles.