1. 获取变量方法
   1.Field[] getFields() 返回所有公共成员变量对象的数组
   剩下的与前面获取方法的方法类似
   2.赋值
   void set(Object obj,Object value)
   给obj对象的成员变量赋值为Value，

2. 实例

 //获取Class对象Class<?> c = Class.forName("com.itheima_02.Student");//Student s = new Student();Constructor<?> con = c.getConstructor();Object obj = con.newInstance();System.out.println(obj);//s.name = "林青霞";
//        Field nameField = c.getField("name"); //NoSuchFieldException: nameField nameField = c.getDeclaredField("name");nameField.setAccessible(true);nameField.set(obj, "林青霞");System.out.println(obj);//s.age = 30;Field ageField = c.getDeclaredField("age");ageField.setAccessible(true);ageField.set(obj,30);System.out.println(obj);//s.address = "西安";Field addressField = c.getDeclaredField("address");addressField.setAccessible(true);addressField.set(obj,"西安");System.out.println(obj);