java反射学习一

config.properties
//包名内容：
com.dd

/**
     * * 榨汁机(Juicer)榨汁的案例
     * 分别有水果(Fruit)苹果(Apple)香蕉(Banana)桔子(Orange)榨汁(squeeze)
     * @throws IOException 
     */
    public static void main(String[] args) throws Exception {
        Juicer j = new Juicer();                                    //创建榨汁机
        //j.run(new Apple());
        //j.run(new Orange());
        BufferedReader br = new BufferedReader(new FileReader("config.properties"));
        Class clazz = Class.forName(br.readLine());                 //获取该类的字节码文件
        Fruit f = (Fruit) clazz.newInstance();                      //创建实例对象
        j.run(f);

    }
}
interface Fruit {
    public void squeeze();
}
class Apple implements Fruit {
    public void squeeze() {
        System.out.println("榨出一杯苹果汁儿");
    }
}

class Orange implements Fruit {
    public void squeeze() {
        System.out.println("榨出一杯橘子汁儿");
    }
}

class Juicer {
    /*public void run(Apple a) {
        a.squeeze();
    }

    public void run(Orange o) {
        o.squeeze();
    }*/

    public void run(Fruit f) {
        f.squeeze();
    }