about java exceptions

i am using eclipse to write java servlets...it warns me sometimes to put try catch on some blocks of code...these exceptions are the defined exceptions in java library like;

NullPointerException,SQLException,DataFormatException etc...

but for example when i write a code like below it has mkdir() method...If the creation of folder fails how am i going to know that it is failed? eclipse dont warn me to cover it between try&catch and there is no defined exception about it...

File myfile=new File("path/newfolder");

if(!myfile.exits())

myfile.mkdir();

how am i going to catch and understand if folder creation fails?

thank you

Message was edited by:

netsonicc

[818 byte] By [netsonicca] at [2007-11-27 2:23:27]