Database - Object-Oriented Data Modeling - Discussion

Discussion :: Object-Oriented Data Modeling - General Questions (Q.No.5)

5. 

An abstract class is which of the following?

[A]. A class that has direct instances, but whose descendants may have direct instances.
[B]. A class that has no direct instances, but whose descendants may have direct instances.
[C]. A class that has direct instances, but whose descendants may not have direct instances.
[D]. A class that has no direct instances, but whose descendants may not have direct instances

Answer: Option B

Explanation:

No answer description available for this question.

Kadam Shailesh Ashok said: (Oct 3, 2011)  
What is mining of the abstract class?

Kiran Kumar said: (May 17, 2016)  
Interface- 100% not implemented methods.

Abstract class - 0 to 100% implemented methods.

Concrete class - 100% implemented methods.

Ambachew Assefa said: (Jul 23, 2019)  
Please explain it in detail.

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