package auction.commands; import auction.Command; import auction.Person; import auction.User; import auction.impl.ServerImpl; public class GetCredit implements Command { public String execute(String canal, String params) { Person p = ServerImpl.instance.getCanals().get(canal); if(p==null) return "ERROR: no user logged on this canal"; if(p instanceof User) return ((User)p).getAccount().getCredits(); return "ERROR: only users have an account"; } }