Examples of java.nio.file.WatchService.poll()

java.nio.file.WatchService.poll()
Retrieves and removes the next watch key, or {@code null} if none arepresent. @return the next watch key, or {@code null} @throws ClosedWatchServiceException if this watch service is closed

  public void testOpenWatchServicesClosed() throws IOException {
    WatchService ws1 = fs.newWatchService();
    WatchService ws2 = fs.newWatchService();


    assertNull(ws1.poll());
    assertNull(ws2.poll());


    fs.close();


    try {
      ws1.poll();

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      fail();
    } catch (ClosedWatchServiceException expected) {
    }


    try {
      ws2.poll();
      fail();
    } catch (ClosedWatchServiceException expected) {
    }
  }

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