package com.itheima;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class InstroSpectorText {
public static void main(MainParameter parameterObject) throws Exception{
  ReflectPoint rpt1 =new ReflectPoint(3,5);
  String PropertyName = "x";
  
  getProperty(rpt1, PropertyName);
  
  int x = 7;
  
  setProperty(rpt1, PropertyName, x);
}
private static void setProperty(ReflectPoint rpt1, String PropertyName,
   int x) throws IntrospectionException, IllegalAccessException,
   InvocationTargetException {
  PropertyDescriptor pd1 = new PropertyDescriptor(PropertyName, ReflectPoint.class);
  Method pw = pd1.getWriteMethod();
  pw.invoke(rpt1, x);
  System.out.println(rpt1.getX());
}
private static void getProperty(ReflectPoint rpt1, String PropertyName)
   throws IntrospectionException, IllegalAccessException,
   InvocationTargetException {
  PropertyDescriptor pd = new PropertyDescriptor(PropertyName, ReflectPoint.class);
  Method pr = pd.getReadMethod();
  System.out.println(pr.invoke(rpt1));
}
}


我是按章张老师的视频一步步写的，重构了方法之后就运行不了，提示出现重大错误，系统即将停止！怪吓人的

public static void main(MainParameter parameterObject)
我想知道这是什么。