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OCPJP708.6

Cert Obj Watch a directory for changes with the WatchService interface.

[8.6.1] Objective Watch a directory for changes with the WatchService interface.
[8.6.2] Steps for setup 1. Create a new WatchService 2. Register it on a Path listening to one or more event types
[8.6.3]Handling WatchKey 3. Loop until you are no longer interested in these events 4. Get a WatchKey from the WatchService 5. Call key.pollEvents and do something with the events 6. Call key.reset to look for more events
[8.6.4]Within the loop, you need to get a WatchKey. First choice is take() The most common is to call take(), which waits until an event is available. It throws an InterruptedException if it gets interrupted without finding a key. This allows you to end the program.
[8.6.5] Second choice is poll() The other way is to call poll(), which returns null if an event is not available. You can provide optional timeout parameters to wait up to a specific period of time for an event to show up.
[8.6.6] Finally, you call key.reset(). This is very important. If you forget to call reset, the program will work for the first event, but then you will not be notified of any other events.
Created by: MVK2013