Traverse only files under dir in Java

/*from ww w.  j a v a  2 s  .  co m*/
import java.io.File;

public class Main {
  public static void main(String[] argv) throws Exception {
     visitAllFiles(new File("c:/"));
  }

  public static void visitAllFiles(File dir) {
    if (dir.isDirectory()) {
      String[] children = dir.list();
      for (int i = 0; i < children.length; i++) {
        visitAllFiles(new File(dir, children[i]));
      }
    } else {
      System.out.println(dir);
    }
  }
}