java设计模式_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、产品族和产品等级结构

三、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。

//示例1:
public interface Fruit {

/**
* 采集
*/
public void get();

}

public abstract class Apple implements Fruit {

/*
* 采集
*/
public abstract void get();

}

public class NorthApple extends Apple {

/*
* 采集
*/
@Override
public void get() {
System.out.println("采集北方的平果");
}

}

public class SouthApple extends Apple {

/*
* 采集
*/
@Override
public void get() {
System.out.println("采集南方的平果");
}

}

public abstract class Banana implements Fruit {

/*
* 采集
*/
public abstract void get();

}

public class NorthBanana implements Fruit {

/*
* 采集
*/
public void get(){
System.out.println("采集北方的香焦");
}

}

public class SouthBanana implements Fruit {

/*
* 采集
*/
public void get(){
System.out.println("采集南方的香焦");
}

}

public interface FruitFactory {

//实例化Apple
public Fruit getApple();

//实例化Banana
public Fruit getBanana();

}

public class NorthFruitFactory implements FruitFactory {

@Override
public Fruit getApple() {
return new NorthApple();
}

@Override
public Fruit getBanana() {
return new NorthBanana();
}

}

public class SouthFruitFactory implements FruitFactory {

@Override
public Fruit getApple() {
return new SouthApple();
}

@Override
public Fruit getBanana() {
return new SouthBanana();
}

}

public class MainClass {

public static void main(String[] args) throws Exception {
FruitFactory northFruitFactory = new NorthFruitFactory();
Fruit northApple = northFruitFactory.getApple();
northApple.get();
Fruit northBanana = northFruitFactory.getBanana();
northBanana.get();

FruitFactory southFruitFactory = new SouthFruitFactory();
Fruit southApple = southFruitFactory.getApple();
southApple.get();
Fruit southBanana = southFruitFactory.getBanana();
southBanana.get();
}

}
//采集北方的苹果
//采集北方的香焦
//采集南方的苹果
//采集南方的香焦

//*现在考虑增加一个温室类型水果
public class WenshiApple extends Apple {

@Override
public void get() {
System.out.println("采集温室苹果");
}

}

public class WenshiBanana extends Banana {

@Override
public void get() {
System.out.println("采集温室香焦");
}

}

public class WenshiFruitFactory implements FruitFactory {

@Override
public Fruit getApple() {
return new WenshiApple();
}

@Override
public Fruit getBanana() {
return new WenshiBanana();
}

}

public class MainClass {

public static void main(String[] args) throws Exception {
FruitFactory northFruitFactory = new NorthFruitFactory();
Fruit northApple = northFruitFactory.getApple();
northApple.get();
Fruit northBanana = northFruitFactory.getBanana();
northBanana.get();

FruitFactory southFruitFactory = new SouthFruitFactory();
Fruit southApple = southFruitFactory.getApple();
southApple.get();
Fruit southBanana = southFruitFactory.getBanana();
southBanana.get();

FruitFactory wenshiFruitFactory = new WenshiFruitFactory();
Fruit wenshiFruit = wenshiFruitFactory.getApple();
wenshiFruit.get();

Fruit wenshiBanana = wenshiFruitFactory.getBanana();
wenshiBanana.get();
}

}
//采集北方的苹果
//采集北方的香焦
//采集南方的苹果
//采集南方的香焦
//采集温室苹果
//采集温室香焦