### Question:
StringUtils { public static boolean isNotEmpty(final CharSequence cs) { return !isEmpty(cs); } private  StringUtils(); static boolean isEmpty(final CharSequence cs); static boolean isNotEmpty(final CharSequence cs); static boolean isBlank(String s); static boolean isNotBlank(String s); static String replaceNRTtoUnderline(String src); static final String EMPTY; }### Answer:
@Test public void testIsNotEmpty() { boolean b = StringUtils.isNotEmpty(null); Assert.assertFalse(b); b = StringUtils.isNotEmpty(""); Assert.assertFalse(b); b = StringUtils.isNotEmpty(" "); Assert.assertTrue(b); b = StringUtils.isNotEmpty("test"); Assert.assertTrue(b); }