[java] catch the exceptions in a proper way

[mickey]

Hello,
I'm new to Java and I found out that I sometimes do mistake missing try/catch blocks. I'm working on Eclipse. Just now I've finished a program but I'm wondering if I put all try/catch. Is there a way to check it? (tricks, maybe with ecplipse?).
What do you suggest in general or in this case?

thanks,,,

[caduel]

as there no "the right place" to catch an exception, no.
(It might be appropriate to wrap the statement that might throw itself, or a larger block, or the calling function call, even just to catch all the exceptions in "main". You have to decide where you want to deal with them. One argument for a catch block is: if want to retry an alternative to the failed code, or if you need to do cleanup...)

HTH

[mickey]

maybe my question was a bit different. Example: I wrote a program that it seemed work but I didn't catch an exception; I didn't see it. However, my program was working and i was lucky that in many "run" no problem related that bug appeared.
How can I avoid this bad situation, I I worte another program and i'm scarred to have made the same mistake. do you understand now? thanks,

[caduel]

I usually wrap my main eventloop with a try/catch-block. If an event (or external command) caused an exception I log (and ignore it, unless it is a known 'fatal' exception).

[rexi]

I wrote a program that it seemed work but I didn't catch an exception; I didn't see it.

Was it a NullPointerException? In general, you can't "miss" an exception, you have to handle it one way or another (catch it or pass it on to a higer level), otherwise the compiler will complain. There are, however, unchecked exceptions (those derived from RuntimeException, for which Java does not enforce these rules. I guess the one you missed was of this kind. To catch and handle those, study the documentation of the classes you use. The exceptions that could be thrown should be mentioned there. But in the end, you still have to decide where and how to handle an exception.