import javax.swing.JOptionPane;
import java.util.*;

public class DialogTimer
{
    public static void main(String[] args)
    {
        int time1, time2, milli1, milli2, sec1, sec2, timeDifference;
        GregorianCalendar before = new GregorianCalendar();
        milli1 = before.get(Calendar.MILLISECOND);
        sec1 = before.get(Calendar.SECOND);
        time1 = 1000 * sec1 + milli1;

        JOptionPane.showConfirmDialog(null, "Is stealing ever justified? ");

        GregorianCalendar after = new GregorianCalendar();
        milli2 = after.get(Calendar.MILLISECOND);
        sec2  = after.get(Calendar.SECOND);
        time2 = 1000 * sec2 + milli2;

        timeDifference = time2 - time1;
        JOptionPane.showMessageDialog(null,"It took "+timeDifference+" milliseconds for you to answer");
        System.exit(0);
    }
}