Class and Instance Quiz

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Questions and Answers

What is a class in object-oriented programming?

  • A specific occurrence of an object
  • A compile time feature
  • A member function or method
  • A program-code-template for creating objects (correct)

What are instance variables in object-oriented programming?

  • Variables of type Class
  • Variables declared at run-time
  • Member variables specific to an object (correct)
  • Variables shared across the class

In certain languages, classes are only a compile time feature. What does this mean?

  • Classes are immutable
  • Classes are created during run-time
  • New classes cannot be declared at run-time (correct)
  • Classes are dynamically typed

What is an instance in object-oriented programming?

<p>A concrete occurrence of any object (B)</p> Signup and view all the answers

What is a metaclass in object-oriented programming?

<p>A class that creates classes within itself (A)</p> Signup and view all the answers

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Study Notes

Classes in Object-Oriented Programming

  • A class is a blueprint or a template that defines the characteristics and behaviors of an object
  • It defines the properties and methods of an object

Instance Variables

  • Instance variables are data members of a class that are defined inside the class but outside any method
  • Each instance of the class has its own copy of the instance variables

Classes as a Compile-Time Feature

  • In certain languages, classes are only a compile-time feature, meaning they are only used during the compilation process
  • The class definition is not included in the generated code, and only the resulting object code is used at runtime

Instances

  • An instance is an object that is created from a class, with its own set of attributes and methods
  • Each instance has its own unique set of values for its instance variables

Metaclasses

  • A metaclass is a class that creates classes, allowing customization of the class creation process
  • Metaclasses are classes whose instances are classes

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