Java I\O How to know if a file is in use

I'm writing a program that rename a file by time stamping it, but before I rename the file I want
to check if it's being used by another program. How can I do that in Java. I'm using JDK 1.3
thanks in advance

The OS Shouldnt let u rename a file that is in use, I am guessing that java.io.Files renameTo() method will return false if the file is in use.

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