public static void copyDirContent(@NotNull File fromDir, @NotNull File toDir) throws IOException {
    File[] children = ObjectUtils.notNull(fromDir.listFiles(), ArrayUtilRt.EMPTY_FILE_ARRAY);
    for (File child : children) {
      copyFileOrDir(child, new File(toDir, child.getName()));
    }
  }
public static void copyDirContent(@NotNull File fromDir, @NotNull File toDir)