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Master the Five SOLID Principles of OOP System Design

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Master the Five SOLID Principles of OOP System Design

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Questions and Answers

What is the Single Responsibility Principle (SRP)?

Each class should have only one job or responsibility. (correct)

If you have a parent class and one or more child classes, you should be able to use an object of any child class in place of an object of the parent class.

Classes should not be forced to implement interfaces they don't use.

Classes should be open for extension but closed for modification.

What is the Open/Closed Principle (OCP)?

Classes should be open for extension but closed for modification. (correct)

If you have a parent class and one or more child classes, you should be able to use an object of any child class in place of an object of the parent class.

Classes should not be forced to implement interfaces they don't use.

Each class should have only one job or responsibility.

What is the Liskov Substitution Principle (LSP)?

Each class should have only one job or responsibility.

Classes should be open for extension but closed for modification.

Classes should not be forced to implement interfaces they don't use.

If you have a parent class and one or more child classes, you should be able to use an object of any child class in place of an object of the parent class. (correct)

What is the Interface Segregation Principle (ISP)?

Classes should not be forced to implement interfaces they don't use. Signup and view all the answers

What is the Dependency Inversion Principle (DIP)?

Both high-level modules and low-level modules should depend on abstractions. Signup and view all the answers

What is loose coupling?

Classes or components have a minimal level of interdependence. Signup and view all the answers

What is the purpose of using interfaces in achieving loose coupling?

To minimize the dependency between classes. Signup and view all the answers

Study Notes

SOLID Principles

Single Responsibility Principle (SRP): A class should have only one reason to change, meaning it should have only one responsibility or single purpose.

Open/Closed Principle (OCP)

A software entity should be open for extension but closed for modification, meaning we can add new functionality without modifying existing code.

Liskov Substitution Principle (LSP)

Derived classes should be substitutable for their base classes, ensuring that any code that uses a base class can work with a derived class without knowing the difference.

Interface Segregation Principle (ISP)

A client should not be forced to depend on interfaces it does not use, promoting smaller, more focused interfaces that are more flexible and easier to maintain.

Dependency Inversion Principle (DIP)

High-level modules should not depend on low-level modules, but rather both should depend on abstractions, reducing coupling and increasing flexibility.

Loose Coupling

Loose coupling refers to the decoupling of components, allowing them to change independently without affecting each other, reducing dependencies and increasing system flexibility.

Interfaces and Loose Coupling

Interfaces help achieve loose coupling by providing a contract for classes to implement, allowing them to be interchangeable and reducing dependencies between components.

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Description

Test your knowledge of OOP system design by taking this quiz on the five SOLID principles. Learn about the Single Responsibility Principle (SRP), Open-Closed Principle (OCP), Liskov Substitution Principle (LSP), Interface Segregation Principle (ISP), and Dependency Inversion Principle (DIP). Challenge yourself to apply these principles to real-world scenarios and become a better OOP programmer.