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Questions and Answers
What is the Open Closed Principle?
What is the key to the Open Closed Principle?
What does the Liskov Substitution Principle state?
What does the LogOn function depend on, according to the text?
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What is the purpose of the Interface Segregation Principle?
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Study Notes
Open Closed Principle
- Software entities should be open for extension but closed for modification, allowing new functionality without altering existing code.
- Encourages the use of interfaces and abstract classes to create a modular architecture.
Key to the Open Closed Principle
- The key is to design systems in a way that accommodates new behavior by adding new code, rather than changing existing, potentially stable code.
- This reduces the risk of introducing bugs in well-tested modules.
Liskov Substitution Principle
- States that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
- Emphasizes the importance of adhering to the behavioral expectations of the base class in derived classes.
LogOn Function Dependency
- The LogOn function relies on the authentication mechanism, which may include various user inputs and system processes.
- Ensures that LogOn functionality remains consistent regardless of the underlying implementation details.
Interface Segregation Principle
- Advocates for creating small, specific interfaces instead of large, general-purpose ones to ensure that implementing classes only need to be concerned with methods that are relevant to them.
- Promotes a cleaner, more understandable codebase and enhances maintainability.
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Description
Test your knowledge of class design principles such as the Open Closed Principle, Liskov Substitution Principle, Dependency Inversion Principle, and Interface Segregation Principle. Adapted from the book Software Design: From Programming to Architecture by Eric J. Braude (Wiley 2003).
