java实现CSV 字段分割

private static string[] cvsfield(string line){
    list<string> fields = new linkedlist<>();
    char[] alpah = line.tochararray();
    boolean isfieldstart = true;
    int pos = 0; int len = 0; boolean yinhao = false;
    for(char c : alpah){
      if(isfieldstart){
        len = 0;
        isfieldstart = false;
      }
      if(c == '\"'){
        yinhao = !yinhao;
      }
      if(c == ',' && !yinhao){
        fields.add(new string(alpah, pos - len, len));
        isfieldstart = true;
      }
      pos++; len++;
    }
    return fields.toarray(new string[0]);
  }