It's not actually an error. As far as I can see, your program has compiled successfully. But there is a warning.
The warning is saying that you have used one or more classes or methods from the Java API that are marked as deprecated. That means that problems have been identified with them and Sun recommend they no longer be used.
If you can adjust the command line used to compile your code, do what the message suggests and add the -Xlint option. This will tell you more about what deprecated method(s) you are using.
If you can't do that, you'll have to go through your code and look up all the Java API methods you are using in the documentation, to see which one(s) are deprecated.
Some deprecations are "stronger" than others. For instance, Thread.stop() is extremely seriously broken and must never be used, as your program will probably deadlock. In comparison, some of the deprecations in javax.swing might make your GUI look a bit odd, but won't make your code die.
Usually, the API documentation suggests what to use instead of the deprecated method. If you find you really have to use a deprecated method, I believe there is a compiler option to suppress the complaining messages; this is a last resort, though. [ August 16, 2006: Message edited by: Peter Chase ]
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.