I would like to know do we have any software to convert java app i mean .jar file to .dmg file (installer for mac).Thanks in Advance.
A .dmg file is not an installer, it's a disk image file. If you want to make something available for distribution, the easiest way is to create a new folder (directory), copy all of the files and folders you want to distribute into it, and then use either the OS X Disk Utility application (in /Applications/Utilities) or the command line hdiutil utility to create a new disk image file from the contents of the folder.