public String getHelps(String key2) {
   switch (key2) {
     case Str.ftp:
       return Ftp.getHelps();
     case Str.core:
       return Core.getHelps();
     case Str.all:
       return Core.getHelps() + "\n" + Ftp.getHelps() + "\n" + Help.getOthersHelps();
   }
   return "";
 }
 @Override
 public String toString() {
   String s = "";
   if (ftp != null) {
     s += ftp.getNotNull();
   }
   if (core != null) {
     s += core.getNotNull();
   }
   return (s.length() == 0) ? Str.empty : s;
 }