Simple Bowling Secretary

The Simple Factory isn't actually a Design Pattern; it's more of a programming idiom. It is very commonly used, however, so it is included here. The purpose is to move extensive creation work outside of a class and into another, so that only the Simple Factory class need be changed if a new version must be created, leaving the original class intact.

An example of the Simple Factory Design Pattern follows:

public class SimplePizzaFactory {
	public Pizza createPizza(String type) {
		Pizza pizza;
		
		if (type.equals("cheese")) {
			pizza = new CheesePizza();
		}
		if (type.equals("pepperoni")) {
			pizza = new PepperoniPizza();
		}
		if (type.equals("veggie")) {
			pizza = new VeggiePizza():
		}
		return pizza;
	}
}

public class PizzaStore {
	SimplePizzaFactory factory;
	
	public PizzaStore(SimplePizzaFactory factory) {
		this.factory = factory;
	}
	
	public Pizza orderPizza(String ttype) {
		Pizza pizza;
		
		pizza = factory.createPizza(type);
		
		pizza.prepare();
		pizza.bake();
		...
	}
}

Design Patterns

Simple Factory

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