Pizza Store---Factory Pattern

   Let's say you have a pizza shop,and a cutting-edge pizza store owner in
Objectville you might end up writing some code like this:
 

Pizza orderPizza(){
     Pizza pizza=new Pizza();

     pizza.prepare();
     pizza.bake();
     pizza.cut();
     pizza.box();
     
     return pizza;
  }     

But you need more than one type of pizza..
So we build a SimplePizzaFactory

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

The Simple Factory isn't actually a Design Pattern;it is more of a programming idiom.(Factory Method)
Then you got store in NY and Chicago and the pizza they made has different style.

---

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public acstract class PizzaStore{

   public Pizza orderPizza(String type){
        Pizza pizza;
    pizza=createPizza(type);
    pizza.prepare();
    pizza.bake();
    pizza.cut();
    pizza.box();
    
    return pizza;
   }

    protected abstract Pizza createPizza(String type);
}

public class NYStylePizzaStore extends PizzaStore{
   public Pizza createPizza(String item){        
        if(type.equals("cheese")){
            return new NYStyleCheesePizza();
        } else if(item.equals("pepperoni")){
             return new NYStylePepperoniPizza();
        } else if(item.equals("clam")){
            return new NYStyleClamPizza();
         } else if (item.equals("veggie")){
             return new NYStyleVeggiePizza();
         } else return null;
        
       }
}

Order NYStyle cheese pizza:

public class PizzaTest{
  
     public stactic void main(String[] args){
          
           PizzaStore nyStore=new NYPizzaStore();
           Pizza pizza=nyStore.orderPizza("cheese");
       }
}