Question

What is an abstract class? Explain concepts of aggregation, generalization  and specialization with the help of suitable example.

26 Jul 2025
Answer :
Word Count : 481
An abstract class in Object Oriented Analysis and Design (OOAD) is a class that cannot be instantiated directly and is primarily used as a base class from which other classes are derived. It provides a common interface and may include both defined and undefined (abstract) methods. Abstract classes are used when multiple classes share common structure and behavior but also have their own specific implementations. For instance, consider an abstract class `Shape` with an abstract method `area()`. Subclasses like `Circle` ________ ______ _________ ________ ________ __________ ___ ____ _________ _______ ________ ________.
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