package cmd;import core.*;public class UnknownCommand extends SimpleCommand{    public void executeCommand ()    {         System.out.println ("Unknown command. Use 'help' to see options.");    }    public String getMenuName ()    { return "_unknown"; }    public String getName ()    { return "_unknown"; }    public String getDescription ()    { return "Error: Unknown command"; }    public Command makeInstance ()    { return new UnknownCommand (); }}