抽象工厂模式

描述

针对工厂模式增加了抽象类（即接口）

适用

解决工厂方法模式的问题（即修改时不需要修改工厂类），新增功能只需新增新的工厂类；

示例

//基类
interface Animal {
    public void say();
}
// 实现类
class Dog implements Animal {
    @Override
    public void say(){
        Test.printMsg("Dog");
    }
}
class Cat implements Animal {
    @Override
    public void say(){
        Test.printMsg("Cat");
    }
}
//抽象类即接口
interface AnimalInterface{
    public Animal animal();
}
//工厂类
class DogClass implements AnimalInterface{
     @Override
     public Animal animal() {
         return new Dog();
     }
}
class CatClass implements AnimalInterface{
     @Override
     public Animal animal() {
         return new Cat();
     }
}
public class Test {
    public static void printMsg(String msg){
        System.out.println(msg);
    }
    public static void main(String[] args){
        AnimalInterface animal_dog = new DogClass();
        Animal dog = animal_dog.animal();
        dog.say();
        AnimalInterface animal_cat = new CatClass();
        Animal cat = animal_cat.animal();
        cat.say();
    }
}