principle-solid

To refactor a god class for SOLID violations, split modules by change reason to enforce the Single Responsibility Principle, replacing fragile conditionals with extensible abstractions to decouple responsibilities and open the class for extension.

The best way to reduce coupling in object-oriented code is applying SOLID principles, specifically by inverting cross-boundary dependencies to target abstractions rather than concretions, which significantly improves testability and decoupling.

The dependency inversion principle improves testability by ensuring cross-boundary dependencies target abstractions rather than concretions, allowing you to easily substitute implementations during testing without modifying stable production code.

Yes, you can apply SOLID refactoring to Java, Kotlin, and Go production systems to review and redesign classes, interfaces, and inheritance hierarchies that are hard to test and repeatedly edited for new requirements.

You need interface segregation in object-oriented design when preventing fat interfaces, ensuring clients are not forced to depend on methods they do not use, which clarifies contracts and preserves safe substitution across inheritance hierarchies.

Fragile code breaks when adding new requirements because it tightly couples responsibilities and relies on switch statements instead of extensible abstractions, violating the open-closed principle and making stable code require modification for every new feature.