抽象工厂模式：提供一个接口，用于创建相关或依赖对象的家族，而不许要明确指定具体类。
工厂方法模式：定义了一个创建对象的接口，但由子类决定要实例化的类是哪一个。工厂方法让类的实例化推迟到子类。
代码实现：
1.简单工厂（严格上非工厂模式）
（1）创建一个pizza抽象类
public abstract class Pizza {
public abstract void prepare();
public abstract void bake();
public abstract void cut();
public abstract void box();
}(2)继承pizza抽象类，实现两个类
public class ClamPizza extends Pizza{
@Override
public void prepare() {
// TODO Auto-generated method stub
System.out.println("prepare clam pizza.");
}
@Override
public void bake() {
// TODO Auto-generated method stub
System.out.println("bake clam pizza.");
}
@Override
public void cut() {
// TODO Auto-generated method stub
System.out.println("cut clam pizza.");
}
@Override
public void box() {
// TODO Auto-generated method stub
System.out.println("box clam pizza.");
}
}
public class CheesePizza extends Pizza{
@Override
public void prepare() {
// TODO Auto-generated method stub
System.out.println("prepare cheese pizza.");
}
@Override
public void bake() {
// TODO Auto-generated method stub
System.out.println("bake cheese pizza.");
}
@Override
public void cut() {
// TODO Auto-generated method stub
System.out.println("cut cheese pizza.");
}
@Override
public void box() {
// TODO Auto-generated method stub
System.out.println("box cheese pizza.");
}
}(3)简单工厂实现
/**
* 简单工厂模式（一般来说不算工厂模式）
*
*/
public class SimplePizzaFactory {
public Pizza createPizza(String type) {
Pizza pizza = null;
if (type.equals("cheese")) {
pizza = new CheesePizza();
} else if (type.equals("clam")) {
pizza = new ClamPizza();
}
return pizza;
}
}2.工厂方法模式
(1)创建一个PizzaStore抽象类
具体的createPizza操作由子类去实现。
public abstract class PizzaStore {
public Pizza orderPizza(String type) {
Pizza pizza;
pizza = createPizza(type);
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
return pizza;
}
abstract Pizza createPizza(String type);
}（2）创建pizza类，并实现两种不同风味的Pizza
import java.util.ArrayList;
public class Pizza {
String name;
String dough;
String sauce;
ArrayList toppings = new ArrayList();
void prepare() {
System.out.println("Preparing " + name);
System.out.println("Tossing dough...");
System.out.println("Adding sauce...");
for(int i = 0; i < toppings.size(); i++) {
System.out.println(" " + toppings.get(i));
}
}
void bake() {
System.out.println("Bake for 25 minutes at 350");
}
void cut() {
System.out.println("Cutting the pizza into the diagonal slices.");
}
void box() {
System.out.println("Place the pizza in the offical pizza box.");
}
public String getName() {
return name;
}
}
public class NYStyleCheesePizza extends Pizza {
public NYStyleCheesePizza() {
name = "NY style sauce and cheese pizza";
dough = "Thin crust dough";
sauce = "Marinara sauce";
toppings.add("Greated Reggiano pizza");
}
}
public class ChicagoStyleCheesePizza extends Pizza {
public ChicagoStyleCheesePizza() {
name = "Chicago style cheese pizza.";
dough = "Extra trick crust dough";
sauce = "plum tomato sauce";
toppings.add("Shredded Mozzarella Cheese.");
}
void cut() {
System.out.println("Cutting the pizza into square slices.");
}
}(3)继承PizzaStore类，实现两种不同的PizzaStore
public class ChicagoStylePizzaStore extends PizzaStore {
@Override
Pizza createPizza(String type) {
// TODO Auto-generated method stub
Pizza pizza = null;
if (type.equals("cheese")) {
pizza = new ChicagoStyleCheesePizza();
}
return pizza;
}
}
public class NYStylePizzaStore extends PizzaStore {
@Override
Pizza createPizza(String type) {
// TODO Auto-generated method stub
Pizza pizza = null;
if (type.equals("cheese")) {
pizza = new NYStyleCheesePizza();
}
return pizza;
}
}
(4)测试代码
public class PizzaTestDriver {
public static void main(String[] args) {
PizzaStore nyStore = new NYStylePizzaStore();
PizzaStore chicagoStore = new ChicagoStylePizzaStore();
Pizza pizza = nyStore.orderPizza("cheese");
System.out.println("Ethan ordered a " + pizza.getName() + "\n");
pizza = chicagoStore.orderPizza("cheese");
System.out.println("Joel ordered a " + pizza.getName() + "\n");
}
}测试结果：
Preparing NY style sauce and cheese pizza
Tossing dough…
Adding sauce…
Greated Reggiano pizza
Bake for 25 minutes at 350
Cutting the pizza into the diagonal slices.
Place the pizza in the offical pizza box.
Ethan ordered a NY style sauce and cheese pizza
Preparing Chicago style cheese pizza.
Tossing dough…
Adding sauce…
Shredded Mozzarella Cheese.
Bake for 25 minutes at 350
Cutting the pizza into square slices.
Place the pizza in the offical pizza box.
Joel ordered a Chicago style cheese pizza.
3.抽象工厂模式
(1)创建一个原料工厂接口和抽象pizza类
public interface PizzaIngredientFactory {
public Dough createDough();
public Sauce createSauce();
public Veggies[] createVeggies();
public Pepperoni createPepperoni();
public Cheese createCheese();
public Clams createClams();
}
public abstract class Pizza {
String name;
Dough dough;
Sauce sauce;
Veggies[] veggies;
Pepperoni pepperoni;
Cheese cheese;
Clams clam;
public abstract void prepare();
void bake() {
System.out.println("Bake for 25 minutes at 350");
}
void cut() {
System.out.println("Cut the pizza into diagonal slices");
}
void box() {
System.out.println("Place the pizza into offical PizzaStore box");
}
void setName(String name) {
this.name = name;
}
String getName() {
return name;
}
public String toString() {
return name + ((dough != null)?" Dough:"+dough.getClass().getName():"")
+ ((sauce != null)?" Sauce:" + sauce.getClass().getName():"")
+ ((cheese != null)?" Cheese:" + cheese.getClass().getName():"")
+ ((clam != null)?" Clam:" + clam.getClass().getName():"");
}
}
(2)继承PizzaIngredientFactory接口实现具体的原料工厂，继承抽象pizza类实现具体的pizza类
public class NYPizzaIngredientFactory implements PizzaIngredientFactory {
@Override
public Dough createDough() {
// TODO Auto-generated method stub
return new ThinCrustDough();
}
@Override
public Sauce createSauce() {
// TODO Auto-generated method stub
return new MarinaraSauce();
}
@Override
public Veggies[] createVeggies() {
// TODO Auto-generated method stub
Veggies[] veggies = {new Garlic(), new Onion(), new Mushroom(), new RedPepper()};
return veggies;
}
@Override
public Pepperoni createPepperoni() {
// TODO Auto-generated method stub
return new SlicedPepperoni();
}
@Override
public Clams createClams() {
// TODO Auto-generated method stub
return new FreshClams();
}
@Override
public Cheese createCheese() {
// TODO Auto-generated method stub
return new ReggianoCheese();
}
}
public class CheesePizza extends Pizza{
PizzaIngredientFactory factory;
public CheesePizza(PizzaIngredientFactory factory) {
this.factory = factory;
}
@Override
public void prepare() {
// TODO Auto-generated method stub
System.out.println("Preparing " + name);
dough = factory.createDough();
sauce = factory.createSauce();
cheese = factory.createCheese();
}
}
public class ClamPizza extends Pizza{
PizzaIngredientFactory factory;
public ClamPizza(PizzaIngredientFactory factory) {
this.factory = factory;
}
@Override
public void prepare() {
// TODO Auto-generated method stub
System.out.println("Prepare " + name);
dough = factory.createDough();
sauce = factory.createSauce();
cheese = factory.createCheese();
clam = factory.createClams();
}
}
public class ReggianoCheese implements Cheese{
}(3)创建相应的Pizza原料接口并实现相应的原料类
public interface Cheese {
}
public interface Clams {
}
public interface Dough {
}
public interface Sauce {
}
public interface Veggies {
}
public interface Pepperoni {
}
public class FreshClams implements Clams{
}
public class Garlic implements Veggies{
}
public class MarinaraSauce implements Sauce{
}
public class Mushroom implements Veggies{
}
public class Onion implements Veggies{
}
public class RedPepper implements Veggies{
}
public class SlicedPepperoni implements Pepperoni{
}
public class ThinCrustDough implements Dough {
}(4)创建一个pizzaStore，并实现具体的NYPizzaStore
public abstract class PizzaStore {
public Pizza orderPizza(String type) {
Pizza pizza;
pizza = createPizza(type);
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
return pizza;
}
abstract Pizza createPizza(String type);
}
public class NYPizzaStore extends PizzaStore{
@Override
Pizza createPizza(String type) {
// TODO Auto-generated method stub
Pizza pizza = null;
PizzaIngredientFactory factory = new NYPizzaIngredientFactory();
if (type.equals("cheese")) {
pizza = new CheesePizza(factory);
pizza.setName("New York style cheese pizza");
} else if (type.equals("clam")) {
pizza = new ClamPizza(factory);
pizza.setName("New York style clam pizza");
}
return pizza;
}
}(5)测试代码
public class PizzaTestDriver {
public static void main(String[] args) {
PizzaStore nyStore = new NYPizzaStore();
//PizzaStore chicagoStore = new ChicagoStylePizzaStore();
Pizza pizza = nyStore.orderPizza("cheese");
System.out.println("Ethan ordered a " + pizza.toString() + "\n");
pizza = nyStore.orderPizza("clam");
System.out.println("Joel ordered a " + pizza.toString() + "\n");
}
}