config.properties
//包名内容：[Class clazz1 = Class.forName("test.appium.Person");]
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();    }