Simple Java Watch Service implementation

T_Watcher.java

import java.io.IOException;
import java.nio.file.*;

import static java.nio.file.StandardWatchEventKinds.*;

public class T_Watcher {
	public static void main(String[] args) throws IOException {
		Path target_path = Paths.get(args.length > 0 ? args[0] : "/");

		WatchService w_serv = FileSystems.getDefault().newWatchService();

		WatchKey w_key = target_path.register(w_serv, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);


		do {
			for (WatchEvent<?> event : w_key.pollEvents()) {
				WatchEvent.Kind<?> kind = event.kind();

				if (kind == OVERFLOW) continue;
				kind = (WatchEvent.Kind<Path>)kind;

				WatchEvent<Path> ev = (WatchEvent<Path>) event;
				Path filename = ev.context();

				if (kind == ENTRY_CREATE)
					System.out.println("Created: " + filename);
				else if (kind == ENTRY_DELETE)
					System.out.println("Deleted: " + filename);
				else if (kind == ENTRY_MODIFY)
					System.out.println("Modifed: " + filename);

			}
		} while (w_key.reset());
	}
}