What is the purpose of an abstract class?

To provide a blueprint for derived classes

Why do we use interface in Java?

To achieve multiple inheritances

What is the difference between interface and class?

A class contains attributes and behaviors of an object

A class contains only abstract methods

An interface contains only concrete methods

An interface cannot be implemented by a class

What is the difference between class and abstract class?

A concrete class cannot contain an abstract method

An abstract class cannot have abstract methods

An abstract class must contain only abstract methods

What is an abstract class in OOP?

class that contains only concrete methods

A class that cannot be subclassed

A class that contains at least one abstract method

A class that cannot have constructors

Can abstract class have constructor?

Depends on the type of constructor

Can abstract class have variables?

Depends on the type of variable

Can abstract class be instantiated?

Depends on the type of variable

What are abstract methods in Java?

b. Methods that don't require implementation for its declaration

Methods that require implementation for its declaration

c. Methods that cannot be declared abstract

Why do we need interface and abstract class?

Both for abstraction and multiple inheritance

Methods that don't require implementation for its declaration

Can we create object of abstract class in Java?

Depends on the type of variable

What is a subclass in Java?

A class that is derived from another class

A class that is independent from all other classes

What is multithreading in Java?

Process of executing two or more threads simultaneously

Process of executing one thread at a time

Process of executing threads one after another

What is the result of using more abstraction?

Technical, financial and social

What are the three types of abstraction?

Descriptive, informative and critical

Technical, financial and social

Theory, practice and experiment

Can interface extend another interface?

Yes, interfaces can extend other interfaces

No, interfaces cannot extend other interfaces

It depends on the programming language

Yes, we can override static methods in Java

Can we override static method?

No, we cannot override static methods in Java

Yes, we can override static methods in Java

It depends on the type of static method

Yes, interfaces can extend other interfaces

3-Abstraction

Authored by ANIL KUMAR

English

Professional Development

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30 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Why is abstraction used in Java?

To show all the details of an object to the user

To hide the unnecessary details from the users

To increase programming complexity and efforts

None of the above

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is abstraction?

Revealing

Displaying

Hiding

Describing

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is abstraction in OOP Java?

Inheritance

Polymorphism

Encapsulation

Abstraction

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is a good example of abstraction?

Cooking

Driving

Making coffee

Painting

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What is abstraction and interface in Java?

Methods

Variables

Classes

Inheritance

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Question: What is abstraction in programming?

Hiding complexity

Increasing efficiency

Object-oriented programming principle

All of the above

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

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

Implementation, sketch, abstract

Abstraction, declaration, method

Abstract, non-abstract, sketch

Inheritance, complexity, efficiency

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3-Abstraction

Why is abstraction used in Java?

What is abstraction?

What is abstraction in OOP Java?

What is a good example of abstraction?

What is abstraction and interface in Java?

Question: What is abstraction in programming?

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

What is the purpose of an abstract class?

What is abstraction and polymorphism?

What is an abstract class in Java?

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