Introduction

In software design, tightly coupled classes often lead to complex, rigid systems that are hard to modify or test. When one class handles multiple responsibilities, even a small change can break several parts of the code. Refactoring such designs helps separate concerns and make the system more modular.

Refactoring the Design

The best way to resolve tight coupling is to apply object-oriented design principles, especially the Single Responsibility Principle (SRP) and Dependency Inversion Principle (DIP).

Use Interfaces or Abstract Classes:
Introduce interfaces to define contracts between components. This helps you replace or modify individual parts without affecting others.

Split Responsibilities:
Break down the large class into smaller, focused classes, each handling a specific functionality. For example, separate data access, business logic, and presentation logic into different classes.

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Apply Dependency Injection:
Instead of creating objects directly inside a class, inject dependencies through constructors or setters. This makes it easier to test components using mocks or stubs.

Follow Design Patterns:
Use design patterns like Strategy, Observer, or Factory to decouple behavior and improve flexibility.

Conclusion

By refactoring to reduce tight coupling, you make your system more modular, maintainable, and testable. Each component becomes easier to understand and modify independently. This not only enhances the scalability of your application but also ensures cleaner, more professional code that can evolve with future requirements.