How to find out if the file is locked

Hello All:
I've struggled with this for quite a while now. I want to move a file from one directory to another. I can choose to copy/delete or renameTo. Both works when I tested from a console test app.
However, this is part of a big Swing app of mine. When I tried the code in that app, it always returned false, indicating it failed. I can't get more info other than that. It might be locked by another app, but how I can find out?
Using JDK 1.7's new APIs might be helpful, but I can't use JDK 7.
Thanks for your thoughts,
John

thanks gimbal. I tried process explorer before (I did google before I turned to help in here :-)...), it didn't help much then - maybe I should take a 2 ^nd^ look. Anyway.
I think this still has some relevance to programming, particularly to Swing programming. Please indulge me and let me elaborate:
- I create a JTable in which a list of files under a certain directory is shown;
- I selected one of the files and right click to bring up a popup menu;
- I chose the menu item "Move to folder" to move the select file, the code looks like
boolean b = new File("C:\\temp\\elephnt.ttf").renameTo(new File("C:\\Users\\John\\Documents\\elephnt.ttf"));
System.out.println(b);Thats where the action fails. My best guess is that the Swing component is holding the file's handle therefore it's qualified as opened by "another process".
I just don't know how to tackle the issue.
Thanks,
John

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