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  1. package com.mycompany;
  2.  
  3. import java.io.IOException;
  4. import java.nio.file.*;
  5. import java.util.Scanner;
  6.  
  7. import static java.nio.file.StandardWatchEventKinds.*;
  8.  
  9. public class App {
  10.     public static void main(String[] args) throws IOException, InterruptedException {
  11.         WatchService watcher = FileSystems.getDefault().newWatchService();
  12.         Path path = FileSystems.getDefault().getPath("/home", "vpupkin");
  13.         System.out.println(path.toString());
  14.         WatchKey key =
  15.                 path.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY);
  16.         Thread t = new Thread(() -> {
  17.             do {
  18.                 WatchKey watchKey = null;
  19.                 try {
  20.                     watchKey = watcher.take();
  21.                 } catch (InterruptedException e) {
  22.                     return;
  23.                 }
  24.                 for (WatchEvent<?> event : watchKey.pollEvents()) {
  25.                     WatchEvent.Kind<?> kind = event.kind();
  26.                     if (kind == OVERFLOW) {
  27.                         continue;
  28.                     }
  29.                     WatchEvent<Path> ev = (WatchEvent<Path>) event;
  30.                     Path filename = ev.context();
  31.                     Path child = path.resolve(filename);
  32.                     String contentType = null;
  33.                     try {
  34.                         contentType = Files.probeContentType(child);
  35.                     } catch (IOException e) {
  36.                         e.printStackTrace();
  37.                         continue;
  38.                     }
  39.                     if (null == contentType) {
  40.                         System.out.println("Null");
  41.                         continue;
  42.                     }
  43.                     if (!contentType.equals("text/plain")) {
  44.                         System.err.format("New file '%s'" +
  45.                                 " is not a plain text file.%n", filename);
  46.                         continue;
  47.                     }
  48.                     System.out.format("Emailing file %s%n", filename);
  49.                 }
  50.                 boolean valid = key.reset();
  51.                 if (!valid) {
  52.                     return;
  53.                 }
  54.             } while (true);
  55.         });
  56.         t.start();
  57.         Scanner sc = new Scanner(System.in);
  58.         String next;
  59.         do {
  60.             next = sc.next();
  61.         } while (!next.equals("stop"));
  62.         t.interrupt();
  63.         System.out.println("Bye!");
  64.     }
  65. }
  66.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:9: error: class App is public, should be declared in a file named App.java
public class App {
       ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
stdout 
Standard output is empty
https://ideone.com/9MRmUV
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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