StringUtils { public static String repeat(final String word, final int repeat) { return multiply(word, repeat); }  static boolean isEmpty(final CharSequence str); static int length(final CharSequence str); static boolean hasLength(final CharSequence str); static boolean hasText(final CharSequence str); static String nvl(final String... strs); static List<String> split(final String string, final String delimiter); static String split(final String string, final String delimiter, final int index); static String ltrim(final String str); static String rtrim(final String str); static String trim(final String str); static String join(final Iterable<?> values, final String token); static String join(final Object[] values, final String token); static String multiply(final String word, final int repeat); static void multiply(final StringBuilder buffer, final String word, final int repeat); static String repeat(final String word, final int repeat); static String uncapitalize(final String str); static int countMatches(final String str, final char ch); static String removePrefix(final String str, String prefix); static String removeSuffix(final String str, String suffix); static final String NULL_STRING; static final String EMPTY_STRING; }
@Test public void testRepeat() { final Object[][] testParameters = new Object[][] {{"Hello", 0, ""}, {"Hello", 1, "Hello"}, {"Hello", 2, "HelloHello"}}; assertEquals("", StringUtils.repeat(null, -1)); assertEquals("", StringUtils.repeat(null, 0)); assertEquals("", StringUtils.repeat(null, 1)); for (final Object[] testParameter : testParameters) { String expected = (String) testParameter[2]; String word = (String) testParameter[0]; int repeat = (Integer) testParameter[1]; assertEquals(expected, StringUtils.repeat(word, repeat)); } }