the factory pattern
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The Factory Pattern. Tujuan Pembelajaran. Mengetahui model persoalan yang menggunakan Simple Factory & Factory Method pattern Mengetahui bagaimana menerapkan Simple Factory & Factory Method pattern pada program - PowerPoint PPT PresentationTRANSCRIPT
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The Factory Pattern
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Tujuan Pembelajaran• Mengetahui model persoalan yang
menggunakan Simple Factory & Factory Method pattern
• Mengetahui bagaimana menerapkan Simple Factory & Factory Method pattern pada program
• Mampu menerapkan Simple Factory & Factory Method pattern untuk meningkatkan fleksibilitas kode
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Koleksi Desain Pattern• Creational Patterns :– Singleton– Factory
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Persoalan
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Example
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• Program to an interface not an implementation
• You should be open for extension, yet closed for modification
• Identify the aspects that vary and separate them from what stays the same
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SIMPLE FACTORY
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public class PizzaStore { public Pizza orderPizza(String type){
Pizza pizza;
if (type.equals("cheese")){ pizza = new CheesePizza();}else if (type.equals("pepperoni")){ pizza = new PepperoniPizza();}else if (type.equals("greek")){ pizza = new GreekPizza();}
pizza.prepare();pizza.bake();pizza.cut();pizza.box();
return pizza; }}
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public class PizzaStore { public Pizza orderPizza(String type){
Pizza pizza;
pizza.prepare();pizza.bake();pizza.cut();pizza.box();
return pizza; }}
//Keluarkan Kode & Buat objek khusus untuk // membuat Pizza PizzaFactory
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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("greek")){ pizza = new GreekPizza();}
return pizza; }}
Buat kelas factory untuk menghasilkan objek Pizza
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public class PizzaStore { SimplePizzaFactory factory;
public PizzaStore(SimplePizzaFactory factory){this.factory = factory;
}
public Pizza orderPizza(String type){Pizza pizza;
pizza = factory.createPizza(type);
pizza.prepare();pizza.bake();pizza.cut();pizza.box();
return pizza; }}
composition
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Class Diagram : Simple FactoryPizza
prepare()bake()cut()box()
SimplePizzaFactory
createPizza()
PizzaStore
orderPizza()
ClamPizza
GreekPizzaPepperoniPizza
CheesePizza
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FACTORY METHOD
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PizzaStore
ChicagoPizzaStore
NYPizzaStore
NYPizzaStore nyFactory = new NYPizzaFactory();PizzaStore nyStore = new PizzaStore(nyFactory);nyStore.order(“cheese”);
ChicacoPizzaStore chicagoFactory = new ChicacoPizzaFactory();PizzaStore chicagoStore = new PizzaStore (chicagoFactory);chicagoStore.order(“cheese”);
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public abstract class PizzaStore {
public Pizza orderPizza(String type){Pizza pizza;
pizza = createPizza(type);
pizza.prepare();pizza.bake();pizza.cut();pizza.box();
return pizza; }
public abstract Pizza createPizza(String type);
}
PizzaStore
ChicagoPizzaStore NYPizzaStore
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public class NYPizzaStore extends PizzaStore {
public Pizza createPizza(String type) { Pizza pizza = null; if (type.equals("cheese")){
pizza = new NYCheesePizza(); } else if (type.equals("pepperoni")){
pizza = new NYPepperoniPizza(); }else if (type.equals("greek")){
pizza = new NYGreekPizza(); }
return pizza; }}
public class ChicagoPizzaStore extends PizzaStore {
public Pizza createPizza(String type) { Pizza pizza = null; if (type.equals("cheese")){
pizza = new ChicagoCheesePizza(); } else if (type.equals("pepperoni")){
pizza = new ChicagoPepperoniPizza(); } else if (type.equals("greek")){
pizza = new ChicagoGreekPizza(); }
return pizza; }}
NYPizzaStore Class
ChicagoPizzaStore Class
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Factory Method
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public class NYCheesePizza extends Pizza { public NYCheesePizza(){
name = "NY Style Sauce and Cheese Pizza";dough = "Thin Crust dough";sauce = "Marinara Sauce";topping = "Grated Reggiano Cheese";
}}
public class NYPepperoniPizza extends Pizza {public NYPepperoniPizza(){
name = "Chicago Style Deep Dish Cheese Pizza";dough = "Extra Thick Crust Dough";sauce = "Plum Tomato Sauce";topping = "Shredded Mozzarella";
}
public void cut (){System.out.println("Cutting the pizza into square slices ");
}}
public class NYGreekPizza extends Pizza {public NYGreekPizza () {
name = "NY Style Greek Pizza";dough = "Thin Crust dough";sauce = "Barbeque Sauce";topping = "Mushroom with Parmesan";
}}
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public class TestPizza {public static void main(String[] args) {
PizzaStore nyStore = new NYPizzaStore();Pizza pizza = nyStore.orderPizza("cheese");
}}
Output :Preparing NY Style Sauce and Cheese PizzaTossing dough ... Adding sauce ... Adding topping ... Grated Reggiano CheeseBake for 25 minutes at 350Cutting the pizza into diagonal slicesPlace pizza in official PizzaStore box
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All factory patterns encapsulate object creation. The Factory Method Pattern encapsulates object
creation by letting subclasses decide what objects to create.
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The Creator Classes
PizzaStore
ChicagoPizzaStore
NYPizzaStore
The Product Classes
Pizza
NYCheesePizza
NYPepperoniPizza
NYGreekPizza
ChicagoCheesePizza
ChicagoPepperoniPizza
ChicagoGreekPizza
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The Factory Method Pattern defines an interface for creating an object, but lets subclasses decide which
class to instantiate. Factory Method lets a class defer instantiation to subclasses.
Factory Method -- Definisi
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Factory Method – Class Diagram
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• http://www.eelke.com/files/cs330/factory.pdf • Head First Design Pattern
Referensi
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Latihan1. Terapkan Simple Factory pada contoh DuckStore.
public class DuckStore { public void orderDuck(String type){ Duck duck = null; if (type.equals("rubber")){ duck = new RubberDuck(); } else { duck = new DecoyDuck(); } duck.paint(); duck.pack(); } }
public class Test { public static void main(String [] args){ DuckStore store = new DuckStore(); System.out.println("Order RUBBER DUCK"); store.orderDuck("rubber"); System.out.println("Order DECOY DUCK"); store.orderDuck("decoy"); }}
public class Duck { String color; String material; public Duck(String color, String material) { this.color = color; this.material = material; } public void paint(){ System.out.println("Cat bebek dengan warna "+color); } public void pack(){ System.out.println("Masukkan mainan bebek " +material+" ke dalam kotak"); }}
public class RubberDuck extends Duck { public RubberDuck() { super("YELLOW", "PLASTIC"); } }
public class DecoyDuck extends Duck{ public DecoyDuck() { super("BROWN", "WOOD"); } }
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SimpleDuckFactory
createDuck(String type)
DecoyDuck
DecoyDuck()
RubberDuck
RubberDuck()
Duck
Duck(Stringcolor, String material)paint()pack()
String colorString material
DuckStore
DuckStore(SimpleDuckFactory f)orderDuck(String type)
SimpleDuckFactory factory
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2. Ada 2 pabrik pembuat mainan bebek yaitu FactoryA dan FactoryB dimana masing-masing membuat kedua jenis bebek (Rubber dan Decoy). Penjelasan :
Terapkan Factory Method utk skenario di atas.
Tipe Color Material
RubberA ORANGE STANDAR PLASTIC
DecoyA BLACK MERANTI WOOD
RubberB YELLOW PREMIUM PLASTIC
DecoyB BROWN JATI WOOD
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DuckFactory
createDuck(String type)
DecoyDuckADecoyDuck(color, material)
RubberDuckARubberDuck(color, material)
Duck
Duck(Stringcolor, String material)paint()pack()
String colorString material
FactoryA FactoryB
DecoyDuckBDecoyDuck(color, material)
RubberDuckBRubberDuck(color, material)