StringUtils { public static String nvl(final String... strs) { String val = ObjectUtils.nvl(strs); if (null == val) { return EMPTY_STRING; } return val; }  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 testNvl() { assertEquals("", StringUtils.nvl(null, null)); for (int i = 0; i < 100; ++i) { assertNotNull(StringUtils.nvl(randomUUID().toString(), randomUUID().toString())); } for (int i = 0; i < 100; ++i) { assertNotNull(StringUtils.nvl(randomUUID().toString(), randomUUID().toString(), randomUUID().toString())); } }