设计模式 学习笔记4 抽象工厂

设计模式 抽象工厂模式

 

抽象工厂（AbstractFactory）模式的定义：是一种为访问类提供一个创建一组相关或相互依赖对象的接口，且访问类无须指定所要产品的具体类就能得到同族的不同等级的产品的模式结构。

 

在抽象工厂模式中，接口是负责创建一个相关对象的工厂，不需要显式指定它们的类。每个生成的工厂都能按照工厂模式提供对象。

 

public class AbstractFactory {

 

    public static Factory createFactory(Class<?> c) {

        Factory factory = null;

        try {

            factory = (Factory) c.newInstance();

        } catch (InstantiationException | IllegalAccessException e) {

            e.printStackTrace();

        }

        return factory;

    }

}

 

public interface Factory {

    public Fruits getFruits(Class<?> c);

    public Animal getAnimal(Class<?> c);

}

 

public class AnimalFactory implements Factory{

 

    @Override

    public Fruits getFruits(Class<?> c) {

        return null;

    }

 

    @Override

    public Animal getAnimal(Class<?> c) {

        Animal animal = null;

        try {

            animal = (Animal) c.newInstance();

        } catch (InstantiationException | IllegalAccessException e) {

            e.printStackTrace();

        }

        return animal;

    }

 

}

 

public class FruitsFactory implements Factory{

 

    @Override

    public Fruits getFruits(Class<?> c) {

        Fruits fruits = null;

        try {

            fruits = (Fruits) c.newInstance();

        } catch (InstantiationException | IllegalAccessException e) {

            e.printStackTrace();

        }

        return fruits;

    }

 

    @Override

    public Animal getAnimal(Class<?> c) {

        return null;

    }

 

}

 

public interface Animal {

    public void show();

}

 

public class Pig implements Animal{

 

    @Override

    public void show() {

        System.out.println("this is a pig");

    }

   

}

 

public class Sheep implements Animal{

 

    @Override

    public void show() {

        System.out.println("this is a sheep");

    }

   

}

 

public interface Fruits {

    public void show();

}

 

public class Apple implements Fruits{

 

    @Override

    public void show() {

        System.out.println("this is an apple");

    }

 

}

 

public class Orange implements Fruits{

 

    @Override

    public void show() {

        System.out.println("this is an orange");

    }

 

}