《HeadFirst设计模式(第二版)》第四章代码——工厂模式
代码文件目录结构：
Cheese:
原料ingredient类中只以Cheese为例，不重复展示：
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public abstract class Cheese {
String name;
String getName(){
return name;
}
}
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class NYCheese extends Cheese{
public NYCheese() {
name = "NYCheese";
}
}
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class ChicagoCheese extends Cheese{
public ChicagoCheese(){
name = "ChicagoCheese";
}
}
PizzaIngredientFactory
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public interface PizzaIngredientFactory {
public Dough createDough();
public Sauce createSauce();
public Cheese createCheese();
public Clams createClams();
}
NYPizzaIngredientFactory
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class NYPizzaIngredientFactory implements PizzaIngredientFactory{
@Override
public Dough createDough() {
return new NYDough();
}
public Sauce createSauce(){
return new NYSauce();
}
@Override
public Cheese createCheese() {
return new NYCheese();
}
@Override
public Clams createClams() {
return new NYClams();
}
}
ChicagoPizzaIngredientFactory
package Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class ChicagoPizzaIngredientFactory implements PizzaIngredientFactory{
@Override
public Dough createDough() {
return new ChicagoDough();
}
public Sauce createSauce(){
return new ChicagoSauce();
}
@Override
public Cheese createCheese() {
return new ChicagoCheese();
}
@Override
public Clams createClams() {
return new ChicagoClams();
}
}
Pizza
package Chapter4_FactoryPattern.abstractFactoryPattern.Products;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.*;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public abstract class Pizza {
String name;
Dough dough;
Sauce sauce;
Cheese cheese;
Clams clams;
public abstract void prepare();
public void bake(){
System.out.println("Bake for 25 minutes at 350");
}
public void cut(){
System.out.println("Cutting the pizza into diagonal slices");
}
public void box(){
System.out.println("place pizza in official PizzaStore box");
}
public String getName(){
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Pizza{" +
"name='" + name + '\'' +
", dough=" + dough +
", sauce=" + sauce +
", cheese=" + cheese +
", clams=" + clams +
'}';
}
}
CheesePizza
package Chapter4_FactoryPattern.abstractFactoryPattern.Products;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class CheesePizza extends Pizza{
PizzaIngredientFactory ingredientFactory;
public CheesePizza(PizzaIngredientFactory ingredientFactory){
//在初始化的时候确定是哪一种品味（通过原料工厂）
this.ingredientFactory = ingredientFactory;
}
@Override
public void prepare() {
System.out.println("preparing "+name);
dough = ingredientFactory.createDough();
sauce = ingredientFactory.createSauce();
cheese = ingredientFactory.createCheese();
}
}
ClamPizza
package Chapter4_FactoryPattern.abstractFactoryPattern.Products;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class ClamPizza extends Pizza{
PizzaIngredientFactory ingredientFactory;
public ClamPizza(PizzaIngredientFactory ingredientFactory){
this.ingredientFactory = ingredientFactory;
}
@Override
public void prepare() {
System.out.println("preparing "+name);
dough = ingredientFactory.createDough();
sauce = ingredientFactory.createSauce();
cheese = ingredientFactory.createCheese();
clams = ingredientFactory.createClams();
}
}
PizzaStore
package Chapter4_FactoryPattern.abstractFactoryPattern;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public abstract 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);
}
NYPizzaStore
package Chapter4_FactoryPattern.abstractFactoryPattern;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.NYPizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.CheesePizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.ClamPizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class NYPizzaStore extends PizzaStore {
protected Pizza createPizza(String item){
Pizza pizza = null;
PizzaIngredientFactory ingredientFactory =
new NYPizzaIngredientFactory();
if(item == "cheese"){
pizza = new CheesePizza(ingredientFactory);
pizza.setName("New York Style Cheese Pizza");
}else if(item =="clam"){
pizza = new ClamPizza(ingredientFactory);
pizza.setName("New York Style Clam Pizza");
}
return pizza;
}
}
ChicagoPizzaStore
package Chapter4_FactoryPattern.abstractFactoryPattern;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.ChicagoPizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Ingredient.PizzaIngredientFactory;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.CheesePizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.ClamPizza;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class ChicagoPizzaStore extends PizzaStore {
@Override
protected Pizza createPizza(String item) {
Pizza pizza = null;
PizzaIngredientFactory ingredientFactory =
new ChicagoPizzaIngredientFactory();
if(item == "cheese"){
pizza = new CheesePizza(ingredientFactory);
pizza.setName("Chicago Style Cheese Pizza");
}else if(item =="clam"){
pizza = new ClamPizza(ingredientFactory);
pizza.setName("Chicago Style Clam Pizza");
}
return pizza;
}
}
PizzaTestDrive
package Chapter4_FactoryPattern.abstractFactoryPattern;
import Chapter4_FactoryPattern.abstractFactoryPattern.Products.Pizza;
/**
* @Author 竹心
* @Date 2023/8/4
**/
public class PizzaTestDrive {
public static void main(String[] args) {
PizzaStore nyStore = new NYPizzaStore();
PizzaStore chicagoStore = new ChicagoPizzaStore();
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');
}
}
notes:
简单工厂模式：
就是将平常的new过程封装成一个类来实现
工厂方法模式：
定义一个创建对象的接口，但是由它的子类决定要实例化哪个类。工厂方法让类把实例化推迟到子类
这里的“决定”其实是表示用哪个接口子类来创建产品。
抽象工厂模式：
提供一个接口，用于创建相关或者依赖对象的家族，而不必指定他们的具体类运行结果：
