Mastering Object Oriented Programming

What is a class in Object Oriented Programming?

• A class is a method for data storage.

• A class is a function that executes code.

• A class is a type of variable in programming.

• A class is a blueprint for creating objects in Object Oriented Programming.

Define an object in the context of OOP.

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

• An object is a function that performs actions.

• A class is a blueprint for creating objects.

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

How does inheritance promote code reusability?

• Inheritance prevents code duplication by merging classes.

• Inheritance is used to enforce access control in classes.

• Inheritance allows classes to create new base classes.

• Inheritance promotes code reusability by allowing classes to inherit common functionality from a base class.

What is the difference between a superclass and a subclass?

• A subclass is a parent class that contains multiple superclasses.

• A superclass is a subclass that inherits from another subclass.

• A superclass and a subclass are the same and can be used interchangeably.

• A superclass is a parent class, and a subclass is a child class that inherits from the superclass.

Explain the concept of polymorphism in OOP.

• Polymorphism is the ability to create multiple classes with the same name.

• Polymorphism allows objects of different classes to be treated as instances of a common superclass, enabling a single interface for multiple forms.

• Polymorphism restricts objects to a single class type only.

• Polymorphism is a method of data encryption in programming.

What are the two types of polymorphism?

• Compile-time polymorphism and runtime polymorphism

• Static and dynamic polymorphism

• Method and operator polymorphism

• Type and subtype polymorphism

How does method overriding work in inheritance?

• Method overriding requires the subclass to use the same method name and parameters as the superclass without any changes.

• Method overriding is only applicable to static methods in inheritance.

• Method overriding prevents a subclass from changing the behavior of a superclass method.

• Method overriding allows a subclass to provide a specific implementation of a method already defined in its superclass.

What is encapsulation and why is it important?

• Encapsulation allows direct access to an object's internal state for better performance.

• Encapsulation is the process of combining multiple classes into one.

• Encapsulation is only relevant in functional programming languages.

• Encapsulation is the practice of hiding an object's internal state and requiring all interaction to be performed through an object's methods, which is important for data protection and code maintainability.

Give an example of encapsulation in a class.

• class Person { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; }}

• class Person { private String name; public String name() { return name; }}

• class Person { private String name; public void displayName() { System.out.println(name); }}

• class Person { String name; }

What is the purpose of access modifiers in OOP?

• To implement inheritance in classes.

• To enhance the performance of the program.

• The purpose of access modifiers in OOP is to control the visibility and accessibility of class members.

• To define the data types of class members.