简单反射例子

 public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        Writer writer = new Writer();
        writer.setName("张三");
        System.out.println(writer.getName());
        Class<?> clazz = Class.forName("com.example.demo.entity.Writer");
        
        Constructor<?> constructor = clazz.getConstructor();
        Object o = constructor.newInstance();
        Method setName = clazz.getMethod("setName", String.class);
        setName.invoke(o, "张三");
        Method getName = clazz.getMethod("getName");
        System.out.println(getName.invoke(o));

    }