package headfirst.command.party;public class HottubOnCommand implements Command {	Hottub hottub;	public HottubOnCommand(Hottub hottub) {		this.hottub = hottub;	}	public void execute() {		hottub.on();		hottub.setTemperature(104);		hottub.circulate();	}	public void undo() {		hottub.off();	}}