hide any files in mobile without any help of computer or any software

In any java/ symbian enable mobile handset you can hide any files without any help of computer or any software. First you need to create a folder in your phone/SD card's memory. Give a name (suppose Private) and then give a dot and type jad (Private.jad). Move your desire items in it. Then create a folder again. Give this folder's name matching the previous folder (Private). This time you need to type .jar (Private.jar) . Now Private.jad folder will be hidden. To show the hidden folder just rename the Private.jar to Private.