抽象工厂模式

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

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