How to monitor file changes

all experts.........
i'm wondering if it is possible to monitor the file changes and load updated file contents dynamically for a java application. i have some simple txt file. i'm taking my input data from these files for the simulation. during the sim some of these data will be changed and i need to take these new data as a input for the next step. any idea would help me a lot. thanksssssssss in advance.
arun

There's a few ideas in [url http://forum.java.sun.com/thread.jsp?forum=4&thread=431288]this thread

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