To know when a file get modified.

HI,
I have a requirement like this.
There is a xml file which the user can modify at any time. My program which is running now should get a notification indicating that file has modified and my program will do corresponding updates. How java can support me to achieve this
Thanks in advance
bye

NO it need not be an xml file. I could be text file
also. What i prefer is , instead of polling every
known interval, get a notification when a change
happens. The flow can go like this(if impl exists)
1) Create a File object.
2) set the listener object for that
3) get a notification when user changes that file.
4) take action
:-) this is not possible right??This is exactly what I am telling you to do, but something has to notice the change in the file. That is why you have a separate thread running in the background to monitor the file (it can check every second if you like it takes about 2 milliseconds to check the file). That thread then triggers whatever action you wish to take. As far as the trigger and the action are concerned, look at the Preferences class (as I mentioned) and its PreferenceListener.
Without monitoring it yourself, how do you think you might get notified of a change? If you simply use the Preferences class as is, then you can get these notifications from the system, but you would no longer have control over where and how the things are stored. On windows it uses the registry, on unix I believe some .rc user file or something to that effect. In this case, your application would definately need to provide an interface for changing these values.

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To know when a file get modified.

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