Why Using Interfaces Improves Software Maintainability

Using interfaces is recommended for future maintenance: after the software is fully developed, tested, and deployed, users may request feature changes; with interfaces, developers only need to modify the implementation class in a single package, avoiding changes across multiple packages.

An everyday analogy is a broken electrical wire: you only need to reconnect the copper or aluminum strand inside the wire without stripping the outer insulation, illustrating how interfaces isolate changes to a small part of the system.

If interfaces are not used, modifying code in the DAO layer forces changes in the Service layer that depends on it, requiring recompilation of both layers; in large projects this wastes time and can introduce unexpected issues.

Without interfaces, changes propagate further: actions that reference services must also be updated, leading to a cascade of modifications throughout the codebase, akin to a broken leg causing injuries to the entire body.

END

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