Watcher.java

import java.nio.file.*;
import static java.nio.file.StandardWatchEventKinds.*;
/*
Author: NguyenHaiDang@ActiveStudy
*/
public class Watcher {

    public static void main(String[] args) {
        Path this_dir = Paths.get(".");
        System.out.println("Now watching the current directory ...");

        try {
            WatchService watcher = this_dir.getFileSystem().newWatchService();
            this_dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
            WatchKey watckKey = watcher.take();
            while (watckKey != null) {                
                for (WatchEvent<?> event : watckKey.pollEvents()) {
                System.out.println(event.kind().name() +"\t" + event.context().toString());
                watckKey.reset();
                watckKey = watcher.take();
            }
            }

        } catch (Exception e) {
            System.out.println("Error: " + e.toString());
        }
    }
}