Object‑Oriented Design Principles in Practice
Object‑Oriented Design Principles in Practice Object‑Oriented Design Principles help teams create code that is easier to understand, change, and extend. They are not rigid rules, but guidelines that push us toward loose coupling and clear responsibilities. In practice, you balance simplicity with future needs, deciding when to extend a feature or when to reorganize the design. When adopted early, these ideas reduce bugs and keep future changes affordable. A few rules matter most in real projects. The Single Responsibility Principle says a class should have one reason to change, focusing on a single job. The Open-Closed Principle suggests we extend behavior with new code, not modify existing code. Liskov Substitution requires that derived types can replace their base types without breaking the program. The Interface Segregation Principle favors smaller, client-driven interfaces instead of a large, general one. The Dependency Inversion Principle tells us high‑level modules depend on abstractions, not on concrete details. ...