Question
Critically examine the distinct roles of Abstract Classes and Interfaces as explicit designcontractsin system architecture. Analyze the trade-offs of choosing one over the other whendesigningdecoupling boundaries.
Answer :
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In object-oriented analysis and design, abstract classes and interfaces play an important role in defining explicit design contracts within system architecture. Both mechanisms support abstraction, promote reusability, and help establish relationships between software components. However, they serve different architectural purposes and have distinct implications when designing decoupled boundaries between system modules. An abstract class represents a partially implemented class that defines common characteristics and behaviors for a group of related objects. It can contain abstract methods that subclasses must implement as well as concrete methods that provide shared functionality. In system architecture, abstract classes are useful when there is a strong “is-a” relationship among objects and when multiple components share common state, logic, or implementation details. For example, in a payment processing system, an abstract Payment class may define common attributes such as transaction ID and amount while allowing subclasses like CreditCardPayment and UPI Payment to implement specific processing methods. The major advantage of abstract classes is code reuse. Since they can include implemented methods and instance variables, they reduce duplication and provide a controlled framework for subclasses. They also allow designers to enforce a common structure among related objects. However, abstract classes introduce tighter coupling because subclasses become dependent on the parent class. Changes made to the abstract class may affect all derived classes, making the architecture less flexible when requirements evolve. Additionally, most object-oriented
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