Web Reference: In this Tutorial I will show you how to observe changes on the filesystem such as file creation or modification by using the Java WatchService API. This API enables you to register a directory (or directories) with the watch service. When registering, you tell the service which types of events you are interested in: file creation, file deletion, or file modification. This tutorial explains what is and how to WatchService interface in Java. WatchService watches registered objects for changes and events.
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