solid-principles

Apply SOLID design principles during Java code reviews by checking classes for clear responsibilities and proper abstractions. Use SRP, OCP, LSP, ISP, and DIP as a practical checklist to enforce modularity and testability.

The best way to refactor a monolithic Java service is to decompose its responsibilities into focused components like validators, repositories, and notifiers. This enforces the Single Responsibility Principle for maintainable code.

You need the Liskov Substitution Principle in Java architecture when swapping implementations or extending hierarchies. It ensures subtypes can replace base types without breaking program behavior or requiring unexpected dependencies.

Dependency Inversion improves Java codebase testability by enforcing proper abstractions. High-level modules depend on interfaces rather than concrete implementations, allowing you to swap dependencies with minimal impact during testing.

A Java class requires refactoring when doing too much because it violates the Single Responsibility Principle. Applying SOLID principles decomposes these overloaded responsibilities into focused, extensible, and robust object-oriented components.

You can use Interface Segregation to improve modularity in existing Java code by splitting large interfaces into smaller, client-specific ones. This prevents classes from depending on methods they do not use, reducing coupling.