Database - Object-Oriented Data Modeling - Discussion

Discussion Forum : Object-Oriented Data Modeling - General Questions (Q.No. 5)
5.
An abstract class is which of the following?
A class that has direct instances, but whose descendants may have direct instances.
A class that has no direct instances, but whose descendants may have direct instances.
A class that has direct instances, but whose descendants may not have direct instances.
A class that has no direct instances, but whose descendants may not have direct instances
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
3 comments Page 1 of 1.

Ambachew assefa said:   4 years ago
Please explain it in detail.

Kiran kumar said:   7 years ago
Interface- 100% not implemented methods.

Abstract class - 0 to 100% implemented methods.

Concrete class - 100% implemented methods.

Kadam shailesh ashok said:   1 decade ago
What is mining of the abstract class?

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