如何自定义异常类？

 1 package com.yhqtv.demo01Exception;
 2 
 3 /*
 4  * 如何自定义异常类？
 5  * 1.继承与现有的异常结构：RuntimeException, Exception
 6  * 2.提供全局常量：serialVersionUID
 7  * 3.提供重载的构造器
 8  * */
 9 public class MyException extends RuntimeException {
10     static final long serialVersionUID = -7034897190745766939L;
11 
12     public MyException() {
13     }
14 
15     public MyException(String msg) {
16         super(msg);
17     }
18 }