Java watch service | watch folders using java Nio

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?The WatchService API is fairly low level, allowing you to customize it. You can use it as is, or you can choose to create a high-level API on top of this mechanism so that it is suited to your particular needs.
Here are the basic steps required to implement a watch service:
1.Create a WatchService "watcher" for the file system.
2.For each directory that you want monitored, register it with the watcher. When registering a directory, you specify the type of events for which you want notification. You receive a WatchKey instance for each directory that you register.
3.Implement an infinite loop to wait for incoming events. When an event occurs, the key is signaled and placed into the watcher's queue.
4.Retrieve the key from the watcher's queue. You can obtain the file name from the key.
5.Retrieve each pending event for the key (there might be multiple events) and process as needed.
6.Reset the key, and resume waiting for events.
Close the service: The watch service exits when either the thread exits or when it is closed

?Timestamps:
0:10 - Introduction

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