Thread: what is -xlint message?

Please, help me with my code. I want to do merge sort from simple user input, but keeps show "-Xlint ..." when compile it. Also, it's not working as expected...

 
import java.util.*;
import java.io.*;
//import java.util.StringTokenizer;
 
/**
 *
 * @author rus.ardhiyanto
 */
 
public class SDA1 {
 
    private static String Sip = " Sender ";
    private static String Jam = " Clock ";
    private static String Judul = " Subject ";
 
    public static void main(String args[]) {
 
        String [] no = new String [3];
 
        try  {
            System.out.println("Sender Subject Clock");
            System.out.println();
 
            InputStreamReader input = new InputStreamReader(System.in);
            BufferedReader baca = new BufferedReader (input);
 
            String urut = new String ();
            String sender = new String ();
            String time = new String ();
            String subject = new String ();
 
            List <Email> imel = new ArrayList <Email> ();
 
            if ((urut = baca.readLine()) != null) {
                no = urut.split("  ");
            }
 
            while ((urut = baca.readLine()) != null) {
                StringTokenizer token = new StringTokenizer(urut);
                sender = token.nextToken();
                time = token.nextToken();
                subject = " ";
 
                while (token.hasMoreTokens()) {
                    subject += token.nextToken();
                }
 
                Clock hour = new Clock (time);
                imel.add (new Email(sender, hour, subject));
            }
        Sortir sortir = new Sortir ();
        String[] strTemp = new String[imel.size()];
        String strTem = " ";
 
        for (int i = 0; i < imel.size(); i++) {
            for (int j = 0; j < no.length; j++) {
                if (no[j].equals(Sip)) {
                    strTem += imel.get(i).getSender() + " ";
                }
                else if (no[j].equals(Jam)) {
                    strTem += imel.get(i).getClock().toString() + " ";
                }
                else if (no[j].equals(Judul))  {
                    strTem += imel.get(i).getSubject() +" ";
                }
            }
            strTemp[i] = strTem;
            strTem = " ";
        }
 
        sortir.mergeSort(strTemp);
 
        for (int i = 0; i < imel.size(); i++) {
            System.out.println(strTemp[i]);
        }
 
        }
        catch
                (Exception ex) {
        }
    }
}
 
 
class Sortir {
    List getSortbySender(List Email) {
        List ListTemp = null;
        return ListTemp;
    }
 
    private void merge (Comparable[] a, Comparable[] tmpArray, int Kiri, int Kanan, int KananPol) {
        int KiriAbis = Kanan - 1;
        int tmpPos = Kiri;
        int jmlElements = KananPol - Kiri + 1;
 
        while (Kiri <= KiriAbis && Kanan <= KananPol) {
            if (a[Kiri].compareTo(a[Kanan]) <= 0) {
                tmpArray[tmpPos++] = a[Kiri++];
            }
            else {
                tmpArray[tmpPos++] = a[Kanan++];
            }
        }
 
        while (Kanan <= Kiri) {
            tmpArray[tmpPos++] = a[Kiri++];
        }
 
        while (Kanan <= Kiri) {
            tmpArray[tmpPos++] = a[Kanan++];
        }
 
        for (int i = 0; i < jmlElements; i++, KananPol--) {
            a[KananPol] = tmpArray[KiriAbis];
        }
}
 
    private void mergeSort (Comparable[] a, Comparable[] tmpArray, int kiri, int kanan) {
        if (kiri < kanan) {
            int tengah = (kiri + kanan) / 2;
            mergeSort (a, tmpArray, kiri, tengah);
            mergeSort (a, tmpArray, tengah + 1, kanan);
            merge(a, tmpArray, kiri, tengah + 1, kanan);
        }
    }
 
    public void mergeSort (Comparable a[]) {
        Comparable[] tmpArray = new Comparable[a.length];
        mergeSort(a, tmpArray, 0, a.length - 1);
    }
}
 
class Email {
	private String sender;
	private String subject;
	private Clock clock;
 
 
	Email(String sender, Clock clock, String subject) {
		this.sender = sender;
		this.clock = clock;
		this.subject = subject;
	}
 
	String getSender() {
		return sender;
	}
 
	void setSender(String sender) {
		this.sender = sender;
	}
 
	String getSubject() {
		return subject;
	}
 
	void setSubject(String subject) {
		this.subject = subject;
	}
 
	Clock getClock() {
		return clock;
	}
 
	void setClock(Clock clock) {
		this.clock = clock;
	}
 
    @Override
	public String toString() {
		return sender + " " + clock + " " + subject;
	}
}
 
 
class Clock {
	private Integer hour;
	private Integer minute;
 
 
	Clock(String time) {
		StringTokenizer tok = new StringTokenizer(time, ":");
		hour = Integer.parseInt(tok.nextToken());
		minute = Integer.parseInt(tok.nextToken());
	}
 
	Integer getHour() {
		return hour;
	}
 
	void setHour(Integer hour) {
		this.hour = hour;
	}
 
	Integer getMinute() {
		return minute;
	}
 
	void setMinute(Integer minute) {
		this.minute = minute;
	}
 
    @Override
	public String toString() {
		String out = "";
		if (hour < 10) {
			out += "0" + hour;
		} else  {
			out += hour;
		}
		out += " ";
		if (minute < 10)  {
			out += "0" + minute;
		} else  {
			out += minute;
		}
		return out;
	}
}

thank you