Listing first user on basis of time

Question

hi Sir/Madam,
i am developing a Quiz and there is an entry question.if user answered that answer correct then the name,password and answer and TIme(what time he answered the question) is stored in text file shown below.
I want to set this quiz on LAN.
comment.txt
Name: ram Password: ram Time: 4:56:2:353 Answer: 2
Name: RAM Password: RAM Time: 5:5:12:652 Answer: 2
Name: raja Password: raja Time: 5:25:40:25 Answer: 0
Name: raja Password: raja Time: 5:25:43:525 Answer: 0
Name: raja Password: raja Time: 5:25:45:212 Answer: 0
Name: raja Password: raja Time: 5:27:47:485 Answer: 0
Name: ahbay Password: ahbay Time: 5:39:15:837 Answer: 3
Name: ahbay Password: ahbay Time: 5:39:18:540 Answer: 3
Name: ahbay Password: ahbay Time: 5:39:20:290 Answer: 3
Name: ashok Password: ashok Time: 6:25:52:863 Answer: 3
Name: ashok Password: ashok Time: 6:25:55:847 Answer: 3
Name: ashok Password: ashok Time: 6:25:57:862 Answer: 3
Name: ashok Password: ashok Time: 6:26:52:711 Answer: 3
Name: ashok Password: ashok Time: 6:30:7:845 Answer: 3
Name: john Password: john Time: 6:30:54:617 Answer: 3
Name: ashok Password: ashok Time: 7:12:29:904 Answer: 3
Name: ashok Password: ashok Time: 0:7:34:62 Answer: 3
Now i want to give access to only that user who answered the question first comparing time.
can you please send me code for that I am storing the information in text file using following code.
private void writeToFile(String s) {
          try {              
     BufferedWriter out = new BufferedWriter(new FileWriter("D:\\Quiz\\comment.txt",true));
     out.write(s);
     out.write("\r\n");
     out.close();
     } catch (IOException e) {
          e.toString();
Help me sir,
thanks in Advance

Answer 1

package SimpleAnswer ;
import java.util.*;
        // For best design, create classes seperate classes like TimeComparator that implement
        // Comparable so that you can swap them dynamically at runtime
        // this way you can implement different sorting methods
        // for now though this will work
class User implements Comparable<User>
     // for brevity sake i didn't encapsulate the fields :>
    Long completionTime; // number of miliseconds of time difference, could be Date object as well
    String username;
    String password;
    // just a constructor
    public User (String userName, String password, Long completionTime)
        this.username = userName;
        this.password = password;
        this.completionTime = completionTime;
    // implement the Comparable interface (tells which object goes first)
    public int compareTo(User o)
        // use Long's own implementation of CompareTo
        return  this.completionTime.compareTo(o.completionTime);
public class Main {
    public static void main(String[] args) {
        // TreeSet is a standard collection that implements SortedSet<E> to automatically sort,
        // so lets use that, there is a SortedList implementation available.
        TreeSet<User> users = new TreeSet<User>();
        users.add(new User("bluescanfly", "axis", new Long(13485)));
        users.add(new User("lightning", "somepass", new Long(193)));
        users.add(new User("quicky", "somepass", new Long(1000)));       
        // nice thing we can get the winner right away
        User fastestUser =  users.first();
        System.out.println("User " + fastestUser.username.toUpperCase() + " was quickest with "
         + fastestUser.completionTime + " milliseconds");
        System.out.println("Complete Results");
        System.out.println("================");
        for (User u : users)       
            System.out.println(u.username + " " + u.completionTime.toString());
    }