nl: checks if a charsequence is empty '' '' or null . stringutils.isempty null = true stringutils.isempty '' '' = true stringutils.isempty '' '' = false stringutils.isempty `` bob '' = false stringutils.isempty '' bob '' = false note : this method changed in lang version 2.0 . it no longer trims the charsequence . that functionality is available in isblank . concode_field_sep PlaceHolder placeHolder concode_field_sep T notNull concode_elem_sep String unescape concode_elem_sep String concat concode_elem_sep void onlyOneIsTrue concode_elem_sep void isTrue concode_elem_sep boolean onlyOneIsTrueNonThrow concode_elem_sep String hex concode_elem_sep String toString concode_elem_sep String join concode_elem_sep String join concode_elem_sep void closeQuietly concode_elem_sep T notEmpty concode_elem_sep String escape concode_elem_sep int indexOf
code: boolean function ( CharSequence arg0 ) { return arg0 == null || arg0 . length ( ) == 0 ; }