When do you absolutely have to declare a class as abstract (as opposed to free-

When do you absolutely have to declare a class as abstract
(as opposed to free-willed educated choice or decision based
on UML diagram)?

Question Posted / umesh

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When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choi..

Answer / umesh

When at least one of the methods in the class is abstract.
When the class itself is inherited from an abstract class,
but not all base abstract methods have been over-ridden.

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18 Yes

2 No

When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choi..

Answer / kiran

Following are features of a abstract class :-
√ You can not create a object of abstract class
* How would you describe yourself ?
98
√ Abstract class is designed to act as a base class (to be
inherited by other classes).
Abstract class is a design concept in program development
and provides a
base upon which other classes are built.
√ Abstract classes are similar to interfaces. After
declaring an abstract class, it
cannot be instantiated on it's own, it must be inherited.
√ In VB.NET abstract classes are created
using “MustInherit” keyword.In C#
we have “Abstract” keyword.
√ Abstract classes can have implementation or pure abstract
methods which
should be implemented in the child class.

Is This Answer Correct ?

3 Yes

3 No

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