【LSP】Java异常（三）
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五、 自定义异常如何自定义异常类？继承于现有的异常结构：RuntimeException 、Exception提供全局常量：serialVersionUID提供重载的构造器public class MyException extends Exception{ static final long serialVersionUID = -7034897193246939L; public MyException(){ } public MyException(String msg){ super(msg); }}此时使用自己定义的异常类package com.atguigu.java2;public class StudentTest { 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{ private int id; public void regist(int id) throws Exception { if(id > 0){ this.id = id; }else{ throw new MyException("不能输入负数"); } } @Override public String toString() { return "Student "; } }6|0六、问题进入A----用A方法----制造异常----进入方法B-----调用Bhttp://cdn.u1.huluxia.com/g4/M01/5A/D9/rBAAdl9uzx6ACGvxAAHNS1wWyq4035.jpg
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