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Why Prefer Interfaces (Like `List`) Over Concrete Implementations (Like `ArrayList`) in Java?
- DDDOriginal
- 2024-12-08 08:41:111047browse
Overcoming Resistance to Using Interfaces in Java
PMD can detect violations regarding the usage of implementation types over interfaces. In the above example, PMD reported an issue with the use of ArrayList
Benefits of Using Interfaces
Question: Why should the List interface be preferred over the ArrayList implementation?
Answer: Utilizing interfaces over concrete types promotes encapsulation and loose coupling. Embracing this practice in both personal and public APIs simplifies unit testing via Mocking techniques and facilitates future implementation adjustments.
By selecting the interface, developers achieve:
- Encapsulation: Concealing the implementation details, enabling modifications without impacting client code.
- Loose coupling: Reducing dependencies, allowing for future substitutions or extensions.
- Improved testability: Isolating unit tests from specific implementations, facilitating mocking and testing of the interface's behavior.
Adopting interfaces empowers codebases to be more flexible, maintainable, and adaptable to changing requirements over time.
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