沒有利用反射機制定義的簡單工廠類

interface Fruit{
    public void eat();
}
class Apple implements Fruit{
    public void eat(){
        System.out.println("吃蘋果");
    }
}
class Orange implements Fruit{
    public void eat(){
        System.out.println("吃橘子");
    }
}
//下面定義一個工廠，取得子類的實例化對象；
class Factory{
    public static
 
 Fruit getInstance(String className){
        if("apple".equals(className)){
            return new Apple();
        }else if("orange".equals(className)){
            return new Orange();
        }else{
            return null;
        }
    }
}
public class Test{
    public static void main(String args[]){
        Fruit f 
 
= Factory.getInstance("apple");
        f.eat();
    }
}

java工廠設計模式初步