一、什么是抽象工厂模式
抽象工厂模式是所有形态的工厂模式中最为抽象和最具一般性的。抽象工厂模式可以向客户端提供一个借口，使得客户端在不必指定产品的具体类型的情况下，能够创建多个产品族的产品对象。
Fruit接口
public interface Fruit { /* * 采集 */ public void get();} Apple抽象类
public abstract class Apple implements Fruit{ /* * 采集 */ public abstract void get();} Banana抽象类
public abstract class Banana implements Fruit{ /* * 采集 */ public abstract void get();} FruitFactory工厂类
public interface FruitFactory { //实例化Apple public Fruit getApple(); //实例化Banana public Fruit getBanana();} NorthFruitFactory南方工厂
public class NorthFruitFactory implements FruitFactory { public Fruit getApple() { return new NorthApple(); } public Fruit getBanana() { return new NorthBanana(); }} SouthFruitFactory工厂类
public class SouthFruitFactory implements FruitFactory { public Fruit getApple() { return new SouthApple(); } public Fruit getBanana() { return new SouthBanana(); }} NorthApple北方苹果类
public class NorthApple extends Apple { public void get() { System.out.println("采集北方苹果"); }} NorthBanana北方香蕉
public class NorthBanana extends Banana { public void get() { System.out.println("采集北方香蕉"); }} SouthApple 南方苹果
public class SouthApple extends Apple { public void get() { System.out.println("采集南方苹果"); }} SouthBanana 南方香蕉
public class SouthBanana extends Banana { public void get() { System.out.println("采集南方香蕉"); }} 如果我们增加一个新的温室系列产品则只需要新增
WenshiFruitFactory 温室工厂
public class WenshiFruitFactory implements FruitFactory { public Fruit getApple() { return new WenshiApple(); } public Fruit getBanana() { return new WenshiBanana(); }} WenshiApple 温室苹果
public class WenshiApple extends Apple { public void get() { System.out.println("采集温室苹果"); }} WenshiBanana 温室香蕉
public class WenshiBanana extends Banana { public void get() { System.out.println("采集温室香蕉"); }}
测试类mainclass
public class MainClass { public static void main(String[] args) { FruitFactory ff = new NorthFruitFactory(); Fruit apple = ff.getApple(); apple.get(); Fruit banana = ff.getBanana(); banana.get(); FruitFactory ff2= new SouthFruitFactory(); Fruit apple2 = ff2.getApple(); apple2.get(); Fruit banana2 = ff2.getBanana(); banana2.get(); FruitFactory ff3 = new WenshiFruitFactory(); Fruit apple3 = ff3.getApple(); apple3.get(); Fruit banana3 = ff3.getBanana(); banana3.get(); }}
二、模式中包含的角色及其职责
1.抽象工厂（Creator）角色
抽象工厂模式的核心，包含对多个产品结构的声明，任何工厂类都必须实现这个接口。2.具体工厂（ Concrete Creator）角色具体工厂类是抽象工厂的一个实现，负责实例化某个产品族中的产品对象。3.抽象（Product）角色抽象模式所创建的所有对象的父类，它负责描述所有实例所共有的公共接口。4.具体产品（Concrete Product）角色抽象模式所创建的具体实例对象总结：抽象工厂中方法对应产品结构，具体工厂对应产品族。
