Creational_Abstract Factory

✅ Abstract Factory

• similar to factory,
• but with a focus on the client

• add client to factory pattern

• interface creates the related classes instance
• 👍🏻 can hide which concrete product to the client

✅ Diagram

👀 ShipFactory example

Factory 🆚 AbstractFactory

• 공통점: make creation of instance abstract with instance
• Factory: hide the creation of instance in concrete factory
• focus more on how to implement factory, interitance
• move instance creation process to concrte factory class
• 👉🏻 defines an interface for creating an object, but lets subclasses (or a factory class) decide which class to instantiate
• AbstractFactory: client does not have to see the concrete factory
• foducs more on how to use factory, composition
• create related instances without relying on a concrete class
• 👉🏻 interface for creating families of related objects without specifying their concrete classes.

🛠️

• in javax.xml.parsers
• DocumentBuilderFatory to create xml

public static void main(String[[ args) throws ParserConfigurationException, IOException, SAXException{
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder builder = factory.newDocumentBuilder();
  Document document = builder.parse(new File("src/main/resource/config.xml"));
  System.out.println(document.getDocumentElement());
}

• FactoryBean<T>