3.抽象工厂模式

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其一般性的。抽象工厂模式可以向客户端提供一个接口，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。
二、模式中包含的角色及其职责
1.抽象工厂（Creator）角色 (FruitFactory.java) 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(WenshiFruitFactory.java, SouthFruitFactory.java, NorthFruitFactory.java) 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 (Fruit.java) 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(NorthApple.java, NorthBanana.java, WenshiBanana.java等等) 抽象模式所创建的具体实例对象

Fruit.javapublic interface Fruit {     /*      * 采集      */     public void get(); }Apple.javapublic abstract class Apple implements Fruit{     /*      * 采集      */     public abstract void get(); }SouthApple.javapublic class SouthApple extends Apple {      @Override     public void get() {         System.out.println("采集南方苹果");     }  }NorthApple.javapublic class NorthApple extends Apple {      @Override     public void get() {         System.out.println("采集北方苹果");     }  }WenshiApple.javapublic class WenshiApple extends Apple {      @Override     public void get() {         System.out.println("采集温室苹果");     }  }Banana.javapublic abstract class Banana implements Fruit{     /*      * 采集      */     public abstract void get(); }NorthBanana.javapublic class NorthBanana extends Banana {      @Override     public void get() {         System.out.println("采集北方香蕉");     }  }SouthBanana.javapublic class SouthBanana extends Banana {      @Override     public void get() {         System.out.println("采集南方香蕉");     }  }WenshiBanana.javapublic class WenshiBanana extends Banana {      @Override     public void get() {         System.out.println("采集温室香蕉");     }  }FruitFactory.javapublic interface FruitFactory {     //实例化Apple     public Fruit getApple();     //实例化Banana     public Fruit getBanana(); }NorthFruitFactory.javapublic class NorthFruitFactory implements FruitFactory {      public Fruit getApple() {         return new NorthApple();     }      public Fruit getBanana() {         return new NorthBanana();     }  }SouthFruitFactory.javapublic class SouthFruitFactory implements FruitFactory {      public Fruit getApple() {         return new SouthApple();     }      public Fruit getBanana() {         return new SouthBanana();     }  }WenshiFruitFactory.javapublic class WenshiFruitFactory implements FruitFactory {      public Fruit getApple() {         return new WenshiApple();     }      public Fruit getBanana() {         return new WenshiBanana();     }  }MainClass.javapublic 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();     } }