Java 如何自定义异常类

package com.bytezero.throwable;

/**
 * 
 * @Description      如何自定义异常类
 * @author Bytezero·zhenglei!        Email:420498246@qq.com
 * @version
 * @date 上午8:41:17
 * @  1.继承于现有的异常结构：RuntimeException  Exception
 *    2.提供全局常量： serialVersionUID
 *    3.提供 重载的构造器
 *    
 *    
 */
public class MyException extends Exception {

     static final long serialVersionUID = -7034897190745766939L;
     
     public MyException() {
         
     }
     
     public MyException(String msg) {
         super(msg);
         
     }
}

package com.bytezero.throwable;

public class StudentsTest {

    public static void main(String[] args) {
        try {
            Student s = new Student();
            s.regist(-1001);
            System.out.println(s);
        }catch(Exception e){
//            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }
}

class Student{
    
    int id;
    
    public void regist(int id) throws Exception {
        
        if(id > 0) {
            
            this.id = id;
        }else {
            //System.out.println("您输入的数据非法！");
            
            //手动抛出异常
            //throw new RuntimeException("您输入的数据非法！");
            //throw new Exception("您输入的数据非法！");
            throw new MyException("数据非法-----自定义异常类"); 
        }
        
    }

    @Override
    public String toString() {
        return "Student [id=" + id + "]";
    }
    
    
    
    
}