public static void filtrujZmrz(String filtr){
        FileReader fr = null;

        try{
        fr = new FileReader("objednavky_stat.txt");
        BufferedReader in = new BufferedReader(fr);
        String radek;

        LinkedList<String> vysledek = new LinkedList<String>();

        while((radek = in.readLine())!=null){
            if(radek.contains(": "+filtr)){
                vysledek.add(radek);
            }
        }

        for(int i=0;i<vysledek.size();i++){
            System.out.println(vysledek.get(i));
        }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            if ( fr != null ) {
                try {
                  fr.close();
                }
                catch ( IOException ioe ) {
                  ioe.printStackTrace();
                }
              }
        }


    }