Tools { @Nullable public static String shorten(@Nullable final String word, final int length) { if (word == null) { return null; } if (length < 0) { return ""; } if (word.length() <= length) { return word; } return word.substring(0, length); } private  Tools(); static String getTime(); static String getDoubleDigit(final int number); static String dateToString(@Nullable final Date d, final String format); static String decimalFormat(final String format, final double number); static boolean isValidNick(@Nullable final String nick); static String byteToString(final long bytes); static int getBytes(final String text); static void sleep(final long millis); @Nullable static String capitalizeFirstLetter(@Nullable final String word); @Nullable static String shorten(@Nullable final String word, final int length); @Nullable static String getFileExtension(@Nullable final String filename); @Nullable static String getFileBaseName(@Nullable final String filename); static double percent(final double fraction, final double total); static double percentOf(final double percent, final double total); static String postPadString(final String stringToPad, final int paddedLength); static boolean isEmpty(@Nullable final String string); static String appendSlash(final String path); static File getFileWithIncrementedName(final File existingFile); static String emptyIfNull(@Nullable final String string);  }
@Test public void testShorten() { assertNull(Tools.shorten(null, 5)); assertEquals("Monkey", Tools.shorten("Monkey", 12)); assertEquals("Monkey", Tools.shorten("Monkey", 6)); assertEquals("Monke", Tools.shorten("Monkey", 5)); assertEquals("M", Tools.shorten("Monkey", 1)); assertEquals("", Tools.shorten("Monkey", 0)); assertEquals("", Tools.shorten("Monkey", -5)); }