public String join ( List < String > list ) { if ( list == null ) { return null ; } StringBuilder sb = new StringBuilder ( ) ; boolean first = true ; for ( String s : list ) { if ( s == null ) { if ( convertEmptyToNull ) { s = "" ; } else { throw new IllegalArgumentException ( "StringListFlattener does not support null strings in the list. Consider calling setConvertEmptyToNull(true)." ) ; } } if ( ! first ) { sb . append ( separator ) ; } for ( int i = 0 ; i < s . length ( ) ; i ++ ) { char c = s . charAt ( i ) ; if ( c == escapeChar || c == separator ) { sb . append ( escapeChar ) ; } sb . append ( c ) ; } first = false ; } return sb . toString ( ) ; }
Joins the given list into a single string .