public boolean najdiSurovinu(String nazev){
        boolean bool = false;
        SeznamSurovin s;
        FileWork files = new FileWork();
        s = files.nactiSeznamSurovin();
        for (int i = 0; i < s.list.size(); i++) {
            Surovina source = s.getS(i);//cislo - index 
            if (nazev.toLowerCase().equals(source.getNazev().toLowerCase())) {
                bool = true;
            }            
        }
        return bool;
    }