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Questions and Answers
What are the three important characteristics of a bad design architecture according to Robert Martin?
What does the Single Responsibility Principle (SRP) suggest?
Each software module, class, or interface should have only one reason to change.
The Open-Closed Principle (OCP) states that classes must be designed to allow their behavior to change by modifying existing code.
False
The principle that advises to avoid depending on things that are not used is called the ______.
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What does the Liskov Substitution Principle (LSP) state?
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What are some benefits of following design principles in software development?
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Study Notes
Software Design Principles
- Design Principles are guidelines that help software developers organize methods, data structures, and classes into interconnected frameworks adaptable to changing requirements.
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SOLID Principles are a set of five design principles that promote flexible and maintainable software.
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Single Responsibility Principle (SRP): Each software module, class, or interface should have only one reason to change.
- It ensures that each module is focused on a specific task.
- Example: An
Employeeclass should only be responsible for employee data and not salary calculations.
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Open-Closed Principle (OCP): Software classes should be designed to allow for behavioral changes by adding new code rather than altering existing code.
- This enables extending functionality without breaking existing code.
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Liskov Substitution Principle (LSP): Derived classes should be substitutable for their base classes, promoting interchangeable modules and classes.
- This principle ensures that code remains consistent when using inherited classes.
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Interface Segregation Principle (ISP): Software designers should avoid dependencies on unused features.
- This encourages focused interfaces that only expose necessary information.
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Dependency Inversion Principle (DIP): Flexible software should depend on abstract classes or interfaces rather than concrete implementations.
- It promotes loose coupling by relying on abstractions.
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Single Responsibility Principle (SRP): Each software module, class, or interface should have only one reason to change.
Benefits of Using Design Principles
- Reduced complexity of source code.
- Increased readability, extensibility, and maintainability.
- Reduced accidental errors.
- Easier implementation of reusability.
- Achievement of easier and better software testing.
Single Responsibility Principle (SRP)
- Each module, interface, or class should have only one reason to change, focusing its responsibility on a single task.
- Changes in requirements often correspond to changes in responsibilities.
- Classes with multiple responsibilities should be broken down into smaller, more focused classes.
- A class can have multiple members like methods and variables as long as they relate to a single responsibility.
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Description
Test your knowledge on essential software design principles, including the SOLID principles that guide developers in creating flexible and maintainable software. This quiz will cover concepts like Single Responsibility, Open-Closed, and Liskov Substitution Principle. Challenge yourself to ensure your understanding of these foundational design concepts.
