Granny's Programming Pearls
"inside of every large program is a small program struggling to get out"
The moose likes Beginning Java and the fly likes Modify by throwing Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Head First Android this week in the Android forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Modify by throwing" Watch "Modify by throwing" New topic

Modify by throwing

Jeffery Miller

Joined: Jan 16, 2008
Posts: 2
I need some help to modify the perimeter method in the following program so it will throw an Exception object. Guidence or an example would be appriciated.

Bill Shirley
Ranch Hand

Joined: Nov 08, 2007
Posts: 457

Bill Shirley - bshirley -
if (Posts < 30) JavaRanchFAQ);
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 43368
"ouch". Yes, it will work, but because it is a checked Exception it requires a "throws" or a "try-catch."
Go into your Java folder on your PC, and explore it until you find a file called Unzip that, find a method which throws an Exception, and examine that.
Find the java folder, in that the awt folder, in that the Color class, then inspect its constructors. See how they deal with Exceptions. Have a look at the Java Tutorial here.
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 43368
I really ought to learn to read. I see you already have a try-catch, but not a "throws." You ought not to catch "Exception," but a subclass on Exception.
When I said "method which throws Exceptions" the constructor I quoted is a similar example.
I agree. Here's the link:
subject: Modify by throwing
It's not a secret anymore!