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.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();
}
}