private static void selectPerson() {
   if (Permission.getPermission("ConsoleController.selectPerson")) {
     boolean valid = false;
     int id = -1;
     while (!valid) {
       try {
         System.out.print("Enter ID:");
         id = Integer.parseInt(br.readLine());
         if (id != -1) {
           valid = true;
         }
       } catch (NumberFormatException e) {
       } catch (IOException e) {
       } finally {
         if (!valid) {
           System.out.println("Invalid Format!");
         }
       }
     }
     AccessController.selectPerson(id);
   }
 }
 private static void cleanGuests() {
   if (Permission.getPermission("ConsoleController.cleanGuests")) {
     PersonDatabase.cleanGuests();
   }
 }