Fundamentals of Object-Oriented Programming

What does OOP stand for?

• Object-Oriented Programming

• Object-Oriented Process

• Object-Optimized Programming

• Open Object Protocol

Name the four main principles of OOP.

• Encapsulation, Abstraction, Inheritance, Polymorphism

• Interface

• Composition

• Aggregation

What is a class in OOP?

• A class is a type of variable in OOP.

• A class is a blueprint for creating objects in OOP.

• A class is a collection of data types in OOP.

• A class is a function that performs actions in OOP.

Define an object in the context of OOP.

• A class is a blueprint for creating objects.

• An object is a type of variable that holds a single value.

• An object is a function that performs actions.

• An object is an instance of a class that contains data and methods.

What is inheritance in OOP?

• Inheritance is a method for storing data in a database.

• Inheritance is a mechanism in object-oriented programming that enables a new class to inherit attributes and behaviors from an existing class.

• Inheritance is a way to create multiple instances of a class.

• Inheritance allows classes to be combined into a single class.

Explain polymorphism with an example.

• An example of polymorphism is a method 'calculate()' in a class 'Math'.

• Polymorphism is when a method can only be overridden in the same class.

• Polymorphism allows a class to inherit from multiple superclasses.

• An example of polymorphism is a method 'draw()' in a superclass 'Shape'. Subclasses like 'Circle' and 'Square' can have their own implementations of 'draw()'. When a 'Shape' reference points to a 'Circle' or 'Square' object, calling 'draw()' will execute the respective subclass's method.

What is encapsulation and why is it important?

• Encapsulation allows unrestricted access to all object properties for easier debugging.

• Encapsulation is the process of separating data from methods to enhance performance.

• Encapsulation is a method of storing data in a database without any restrictions.

• Encapsulation is the practice of bundling data and methods that operate on that data within a single unit, restricting access to the internal state of an object, which is important for data integrity and reducing complexity.

What is the difference between an abstract class and an interface?

• An abstract class can have implemented methods and state, while an interface cannot.

• An abstract class can implement multiple interfaces, while an interface cannot implement any classes.

• An abstract class can only be instantiated, while an interface cannot be instantiated.

• An abstract class cannot have any methods, while an interface can.

How does method overloading differ from method overriding?

• Method overloading is about multiple methods in the same class with different signatures, while method overriding is about redefining a superclass method in a subclass.

• Method overloading is used to change the return type of a method.

• Method overloading requires inheritance between classes.

• Method overriding allows multiple methods with the same name in different classes.

What role do constructors play in OOP?

• Constructors are used to delete objects in OOP.

• Constructors initialize objects and set up their initial state in object-oriented programming.

• Constructors define the methods of a class in OOP.

• Constructors are responsible for managing memory allocation.