Core Java Programming Course- Abstraction

This video tutorial explains the concept of abstraction in Java, one of the four pillars of object-oriented programming. It covers the definition and purpose of abstraction, the use of abstract classes and methods, and how to implement abstraction in Java. The tutorial includes a practical example using mobile classes to demonstrate how abstraction hides implementation details while providing functionality. The session concludes with a summary of key points and a discussion on the role of abstraction in software design.

Which of the following is NOT one of the four pillars of object-oriented programming?

• Encapsulation

• Inheritance

• Polymorphism

• Compilation

What is the primary purpose of abstraction in programming?

• To provide detailed implementation to the user

• To hide implementation details and show only functionalities

• To allow multiple inheritance

• To enhance code readability

How can abstraction be achieved in Java?

• Using abstract classes and interfaces

• Using encapsulation

• Using inheritance

• Using polymorphism

What keyword is used to declare an abstract class in Java?

• interface

• abstract

• class

• inherit

Why can't an abstract class be instantiated?

• Because it is a final class

• Because it is a static class

• Because it contains abstract methods

• Because it is a private class

In the example, which method is shared between the iOS and Android classes?

• Zoom

• Double Tap

• Pinch

• Swipe

What does method overriding allow in Java?

• Using a method without parameters

• Providing a specific implementation of a method in a subclass

• Changing the return type of a method

• Creating multiple methods with the same name in the same class

Can an abstract class contain non-abstract methods?

• Yes, and they can have implementations

• No, they must be static

• Yes, but they must be private

• No, all methods must be abstract

What is the role of an abstract class in Java?

• To provide a complete implementation

• To serve as a guideline for subclasses

• To act as a data container

• To allow multiple inheritance

What happens if a subclass does not implement an abstract method from its superclass?

• The program will run without errors

• The subclass will become abstract

• A compilation error will occur

• The method will be ignored