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Use Factory Method when a creator’s subclasses need to choose among implementations of one product type. Use Abstract Factory when a client needs several related products that should belong to a compatible family. The deciding factor is not whether object creation is involved; it is whether the variation concerns one product or a coordinated set of products.
What is the difference between Factory Method and Abstract Factory?
| Question | Factory Method | Abstract Factory |
|---|---|---|
| What varies? | Which implementation of one product type a creator produces. | Which family of related product types a factory produces. |
| Where does the choice live? | In a creation method declared by a creator and overridden by subclasses. | In a replaceable factory object whose methods create the family’s products. |
| How many product categories? | Usually one product interface or category. | Several related product interfaces or categories. |
| What is the main benefit? | Subclasses customize creation while retaining the creator’s shared workflow. | A client can request multiple products from one variant and keep them compatible. |
| What structure does it add? | Creator subclasses and product implementations. | Product interfaces, a factory interface, and concrete factories for the variants. |
Refactoring.Guru defines Factory Method as an interface for creating objects in a superclass that lets subclasses alter the object type, and Abstract Factory as a way to produce families of related objects without naming their concrete classes: Factory Method and Abstract Factory. These are conceptual definitions, not performance claims or rules that every codebase must follow.
When should you use Factory Method?
Choose Factory Method when a creator already has a meaningful workflow that uses a product, but different creator variants should supply different implementations of that same product. The base creator declares a creation method; a subclass overrides it. The rest of the workflow can operate through the product’s shared interface rather than knowing its concrete class.
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A logistics application might have a shared delivery workflow that relies on a transport interface. A road-transport creator supplies a truck, while a sea-transport creator supplies a ship. The workflow can stay in the creator while the subclass determines the transport implementation.
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Example: platform-specific dialog buttons
A dialog class can contain shared behavior for showing and handling a dialog while a platform-specific subclass provides the appropriate button implementation. This is useful when the subclass is a natural place for the choice and the creator’s other logic genuinely benefits from using the product.
Factory Method can make adding a product implementation possible without changing client logic, but each new variation may also bring another creator subclass. If there is no useful creator hierarchy or shared workflow, that inheritance can be more structure than the problem needs.
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When should you use Abstract Factory?
Choose Abstract Factory when a client needs to create several different but related product types, and the products should be selected together as one variant. The factory interface declares a creation method for each product category. A concrete factory implements those methods for a particular family, and the client works with the factory and product interfaces.
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A furniture application could request a chair, sofa, and table from one style-specific factory. The family boundary communicates that those products are intended to go together; clients do not need to instantiate the concrete furniture classes themselves.
Example: a consistent platform UI
A UI application might obtain buttons, menus, and other controls from a factory selected for a platform. Select the concrete factory during initialization—perhaps from configuration or the environment—and pass its abstract interface to the clients that need to create controls. This keeps those clients from independently choosing potentially mismatched implementations.
Abstract Factory’s main cost is the additional family-wide structure: product interfaces and implementations, plus concrete factories. It is worthwhile when compatibility or coordinated selection matters, not simply because an application has several constructors.
How do you decide which pattern fits?
- Identify the variation. If the application chooses one implementation of one product category, consider Factory Method. If it chooses among sets of related product categories, consider Abstract Factory.
- Check whether products must match. If combining products from different variants would be invalid or surprising, an Abstract Factory makes the family boundary explicit.
- Place the decision where it belongs. Use Factory Method when a creator subclass is a useful extension point and its workflow uses the product. Use Abstract Factory when creation spans multiple product categories and a dedicated factory object makes that responsibility clearer.
- Price the added structure. Count the subclasses, interfaces, and concrete factory classes the design requires. If a direct constructor or simpler creation method solves the real problem, prefer that.
- Let the design evolve only when needed. A system can start with Factory Method and later introduce Abstract Factory if it develops coordinated product families. That is one possible evolution, not a required progression.
Is a simple factory the same as Factory Method or Abstract Factory?
No. “Factory” is used broadly for code that creates objects, and a simple factory—a method or object that selects and returns a product—does not automatically qualify as either named pattern. Factory Method specifically relies on a creator hierarchy in which subclasses vary the creation method. Abstract Factory specifically represents a family of related products behind a factory interface. Classify the design by its responsibilities and relationships, not by the presence of a method named create or factory.
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What are the trade-offs?
- Factory Method: keeps product selection near a creator workflow and decouples that workflow from concrete products, but may increase the number of creator subclasses.
- Abstract Factory: centralizes creation of a compatible product family and decouples clients from concrete classes, but adds interfaces and factory classes that can burden a small design.
- Either pattern: is useful only when its extension point or compatibility boundary addresses real variation. Neither is inherently better, faster, or necessary for every object-creation task.
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