Checked and Unchecked Exceptions

• Two choices:
  1. Handle the exception
  2. Tell compiler that you want method to be terminated when the exception occurs
     • Use throws specifier so method can throw a checked exception

       public void read(String filename) throws FileNotFoundException
       {
          FileReader reader = new FileReader(filename);
          Scanner in = new Scanner(reader);
          . . .
       }

     • For multiple exceptions:

       public void read(String filename)
             throws IOException, ClassNotFoundException

     • Keep in mind inheritance hierarchy:
       If method can throw an IOException and FileNotFoundException, only use IOException
• Better to declare exception than to handle it incompetently