自己的例外類別範例

import java.io.*;
import java.sql.*;
public class JavaTest{
 public static void main(String[] args){
   try{
     abc("5a");
   }catch(Exception e){
     System.out.println(e.getMessage());
   }
 }
 public static void abc(String a)throws MyException{
   int value=0;
   try{
     value+=(100/Integer.parseInt(a));
   }catch(Exception e){
     throw new MyException(e);
   }
 }
}

class MyException extends Exception{
 private Exception e;
 MyException(Exception e){
   this.e=e;
 }
 public String getMessage(){
   if(e instanceof NumberFormatException){
     return "數字格式錯誤";
   }else if(e instanceof ArithmeticException){
     return "數值錯誤";
   }
     return "發生不明錯誤,程式即將關閉,若有疑問請洽網路工程師";
 }
}