/** Return key for given object: {workDateDbFormatted}.{startTime24Hour}.{endTime24Hour} */
 private String key(Object o) {
   JournalEntry entry = (JournalEntry) o;
   return entry.getWorkDateDbFormatted()
       + "."
       + entry.getStartTime24Hour()
       + "."
       + entry.getEndTime24Hour();
 }
 @Override
 public void setValueAt(Object object, int row, int col) {
   JournalEntry entry = journals.get(row);
   if (col == 0) {
     entry.name = (String) object;
   } else {
     entry.abbreviation = (String) object;
   }
 }