public String toString() {
   StringBuffer sb = new StringBuffer();
   for (int i = 0; i < entries.size(); i++) {
     sb.append(entries.get(i));
   }
   return sb.toString();
 }
 public void addEntry(Entry obj) {
   if (obj != null) entries.addEntry(obj);
 }
 public int entriesSize() {
   return entries.size();
 }