Continue if u want

public class Main extends JavaPlugin implements Listener {

    public void onEnable(){
        loadconfigs();
        getServer().getPluginManager().registerEvents(this, this);
    }

    public void onDisable(){

    }


    public void loadconfigs(){
        this.getConfig().addDefault("######Hello#####",1);
        this.getConfig().options().copyDefaults(true);
        this.saveConfig();
    }

    @EventHandler
    public void onplayerjoinevent(PlayerJoinEvent e){
        Player p = e.getPlayer();
        p.performCommand(this.getConfig().getString(p.getDisplayName()+".command.waiting"));
        this.getConfig().set(p.getDisplayName()+".command.waiting", "");
    }


    @SuppressWarnings("deprecation")
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        String target = args[1];
        Player target2 = sender.getServer().getPlayer(args[1]);
        if(label.equalsIgnoreCase("qc")){
            if(args[0].equalsIgnoreCase("use")){
                if(target2.hasPlayedBefore() && target2.isOnline()){
                    target2.performCommand(args[2]);
            }else if(label.equalsIgnoreCase("add")){
                this.getConfig().addDefault(target+".command.waiting", args[2]);
                this.saveConfig();
                this.reloadConfig();
            }
            }
        }
        return false;

    }

}