returns true if the given string is null or is the empty string.consider normalizing your string references with #nulltoempty . if you do , you can use string #isempty instead of this method , and you wo n't need special null-safe formsof methods like string #touppercase either . or , if you 'd like to normalize `` in the otherdirection , '' converting empty strings to null , you can use #emptytonull . concode_field_sep PlaceHolder placeHolder concode_field_sep String nullToEmpty concode_elem_sep String padStart concode_elem_sep String commonPrefix concode_elem_sep boolean validSurrogatePairAt concode_elem_sep String repeat concode_elem_sep String commonSuffix concode_elem_sep String emptyToNull concode_elem_sep String padEnd
boolean function ( @ Nullable String arg0 ) { return arg0 == null || arg0 . isEmpty ( ) ; }