SOLID in One Minute Each
45 min · Intermediate
SOLID is five principles for code that is easy to change: Single responsibility, Open/closed, Liskov substitution, Interface segregation, Dependency inversion. In an OOP round you need a one-minute answer for each, with a tiny before/after; the full design treatment lives in Section 19 SOLID Recap & Design Thinking.
Topics in this lesson
- One-minute answers with a tiny before/after
- Single responsibility and open/closed: the discount example
- Liskov: the square-rectangle question
- Interface segregation and dependency inversion in Spring terms
- Interview angle: where SOLID comes up next
Interview questions this lesson answers
- What is SOLID?
- What is the Single Responsibility Principle?
- What is the Open/Closed Principle?
- What is the Liskov Substitution Principle?
- What is the Interface Segregation Principle?
- What is the Dependency Inversion Principle?
- What does "one reason to change" mean in SRP?
- Does SRP mean a class should have only one method?
- How do you spot an SRP violation?
- How does OCP relate to polymorphism?
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