question: validate that the specified argument character sequence is neither null nor a length of zero no characters ; otherwise throwing an exception with the specified message . validate.notempty mystring , `` the string must not be empty '' ; concode_field_sep PlaceHolder placeHolder concode_field_sep T notNull concode_elem_sep boolean isEmpty 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 String escape concode_elem_sep int indexOf
target: T function ( T arg0 , String arg1 , Object ... arg2 ) { if ( arg0 == null ) { throw new IllegalArgumentException ( String . format ( arg1 , arg2 ) ) ; } if ( arg0 . length ( ) == 0 ) { throw new IllegalArgumentException ( String . format ( arg1 , arg2 ) ) ; } return arg0 ; }