### Question:
CharSequenceUtil { public static boolean isNotEmpty(CharSequence charSequence) { return !isEmpty(charSequence); }  static boolean isEmpty(CharSequence charSequence); static boolean isNotEmpty(CharSequence charSequence); static boolean isBlank(CharSequence charSequence); static boolean isNotBlank(CharSequence charSequence);  }### Answer:
@Test public void testIsNotEmpty() { assertFalse(CharSequenceUtil.isNotEmpty(null)); assertFalse(CharSequenceUtil.isNotEmpty("")); assertTrue(CharSequenceUtil.isNotEmpty(" ")); assertTrue(CharSequenceUtil.isNotEmpty(" \t\n\r ")); assertTrue(CharSequenceUtil.isNotEmpty("a")); assertTrue(CharSequenceUtil.isNotEmpty(" a ")); }