Abstraction in Java is an essential object-oriented programming concept that hides implementation details and shows only essential features to users. It can be achieved using abstract classes and interfaces, enabling cleaner, modular, and more maintainable code.
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Which of the following provides abstraction in Java?
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Question 3 of 15
3. Question
Which keyword is used to declare an abstract class?
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Question 4 of 15
4. Question
Can abstraction be achieved 100% using abstract classes?
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Question 5 of 15
5. Question
Which of the following achieves 100% abstraction in Java?
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Question 6 of 15
6. Question
Can an abstract class have non-abstract methods?
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Question 7 of 15
7. Question
What happens if you try to instantiate an abstract class?
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Question 8 of 15
8. Question
Which of the following statements is true about abstraction?
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Question 9 of 15
9. Question
Can abstract methods be private?
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Question 10 of 15
10. Question
What is the minimum number of abstract methods required in an abstract class?
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Question 11 of 15
11. Question
Can we declare a class abstract without having any abstract method?
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Question 12 of 15
12. Question
Which of the following cannot be abstract in Java?
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Question 13 of 15
13. Question
Which of the following best describes the advantage of abstraction?
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Question 14 of 15
14. Question
In which scenario is abstraction most useful?
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Question 15 of 15
15. Question
Can an abstract class implement an interface without defining all its methods?
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Summary
Abstraction in Java is a key principle of OOP that hides complexity and reveals only relevant functionality. It is achieved using abstract classes and interfaces, helping developers write flexible, secure, and maintainable applications.
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