KEY=VALUE

1=value
2=value
3=value

public void save(HashMap<Integer, String> map) {
        try {
            File zone1 = new File("zones/zone1");
            FileOutputStream fileOut = new FileOutputStream(zone1);
            PrintWriter print = new PrintWriter(fileOut);
            for (Map.Entry<Integer, String> m : map.entrySet()) {
                print.println(m.getKey() + "=" + m.getValue());
            }

            print.flush();
            print.close();
            print.close();
        } catch (Exception e) {
        }
    }