The Factory pattern trades some upfront complexity for flexibility: it decouples object creation from usage so new types can be introduced easily, but it also adds indirection and extra classes that can make a small codebase harder to follow.
Key Points: • Advantage: decouples client code from concrete classes, so new product types can be added without changing existing callers. • Advantage: centralizes creation logic, making it easier to change how objects are constructed in one place. • Advantage: supports the open/closed principle by letting you extend behavior through new factory implementations. • Disadvantage: introduces extra classes and indirection that can be overkill for simple object creation. • Disadvantage: a growing number of factory classes can become harder to navigate and maintain as the system scales.
Example: A payment processing app benefits from a PaymentFactory when it needs to support many payment providers, but adding a factory just to create a single simple Logger object would likely be unnecessary ceremony.
Interview Tip: A concise interview answer is:
"Factory's big advantage is decoupling object creation from usage, so you can add new types without touching client code, but the tradeoff is extra indirection and more classes to maintain, which isn't worth it for simple cases with only one or two object types."