How to create a trial version of a Java program [closed]

Answer 1

I check date from what an atomic time server will send me at the beginning at the code. Then, I will compare that date with a specific date. If the atomic time is less, then System.exit(0).

public static GregorianCalendar getAtomicTime() throws IOException {
    BufferedReader in = null;

    try {
        URLConnection conn = new URL("http://64.90.182.55:13").openConnection();
        GregorianCalendar calendar = new GregorianCalendar();
        conn.setConnectTimeout(1000);
        in = new BufferedReader(new InputStreamReader(conn.getInputStream()));

        String atomicTime;
        while (true) {
            if ((atomicTime = in.readLine()).indexOf("*") > -1) {
                break;
            }
        }
        //System.out.println("DEBUG : " + atomicTime);
        String[] fields = atomicTime.split(" ");

        String[] date = fields[1].split("-");
        calendar.set(Calendar.YEAR, 2000 + Integer.parseInt(date[0]));
        calendar.set(Calendar.MONTH, Integer.parseInt(date[1]) - 1);
        calendar.set(Calendar.DATE, Integer.parseInt(date[2]));

        // deals with the timezone and the daylight-saving-time
        TimeZone tz = TimeZone.getDefault();
        int gmt = (tz.getRawOffset() + tz.getDSTSavings()) / 3600000;
        //System.out.println("DEBUG : " + gmt);

        String[] time = fields[2].split(":");
        calendar.set(Calendar.HOUR_OF_DAY, Integer.parseInt(time[0]) + gmt);
        calendar.set(Calendar.MINUTE, Integer.parseInt(time[1]));
        calendar.set(Calendar.SECOND, Integer.parseInt(time[2]));
        return calendar;
    } catch (IOException e) {
        throw e;
    } finally {
        if (in != null) {
            in.close();
        }
    }
}