# Abstract Factory Design Pattern — Java Example

**Pattern:** Creational → Abstract Factory
**Article:** https://ankurm.com/abstract-factory-design-pattern-java/

## What this example shows

A UI toolkit that produces families of related widgets — light theme or dark theme — without the client ever naming a concrete class. `Button` and `TextField` are abstract products; `LightButton`/`LightTextField` and `DarkButton`/`DarkTextField` are the two concrete product families. `UIFactory` declares the creation methods for the whole family; `LightThemeFactory` and `DarkThemeFactory` each produce one consistent family. `Application` is the client — it only depends on `UIFactory` and the abstract products, so swapping the entire theme is a one-line change. `Main` selects the factory via a system property.

## How to run

```bash
javac abstract-factory/*.java -d out/abstract-factory
java -cp out/abstract-factory abstractfactory.Main
# or, for the dark theme family:
java -Dapp.theme=dark -cp out/abstract-factory abstractfactory.Main
```

Requires Java 25.

## Post Section ↔ File Mapping

| Post Section | File(s) |
|---|---|
| Part 1 — The Abstract Products: Button and TextField | `Button.java`, `TextField.java` |
| Part 2 — The Concrete Products (Light family) | `LightButton.java`, `LightTextField.java` |
| Part 2 — The Concrete Products (Dark family) | `DarkButton.java`, `DarkTextField.java` |
| Part 3 — The Abstract Factory: UIFactory Interface | `UIFactory.java` |
| Part 4 — The Concrete Factories | `LightThemeFactory.java`, `DarkThemeFactory.java` |
| Part 5 — The Client: Application | `Application.java`, `Main.java` |

Article: https://ankurm.com/abstract-factory-design-pattern-java/
All patterns: https://ankurm.com/design-patterns-java/