Файлы временного файла Java и автоматизированное удаление

Unless you call the deleteOnExit() method on the file object, it will remain after the application terminates.

It is best however to create the file on your directory and not in the default directory (usually /tmp) which may be erased by the OS.

Take a look at this article on when OSX cleansup the temporary file folders:

http://www.xvsxp.com/system/system_tools_cleanup.php

I wouldn't rely on the temporary file folder as a permanent place to store files...