How can i remove the integer and the double in the TREESET in java?

Question

can anyone help me?
import java.util.*;
import java.io.*;
public class assign1
     public static void main(String [] args)throws Exception
          TreeSet oldaccs = new TreeSet();
          TreeSet curraccs = new TreeSet();
          TreeSet newaccs =new TreeSet();
          TreeSet gradaccs = new TreeSet();
     try
               readAccounts("oldAccounts.txt", oldaccs);
               readAccounts("currAccounts.txt", curraccs);
          catch(IOException ioe)
               System.out.println("Cannot open file");
               System.exit(1);
          //Newacc
          newaccs.addAll(curraccs);
          newaccs.removeAll(oldaccs);
          PrintWriter p = new PrintWriter(new FileWriter("newAccounts.txt"));
          Iterator it;
          it = newaccs.iterator();
          while(it.hasNext()){
          p.println(it.next());
           String str;
           str="!NA";
           while(it.equals(str))
                     p.println(it.next());
          p.close();
          //gradAcc
          gradaccs.removeAll(curraccs);
          gradaccs.addAll(oldaccs);
          PrintWriter q = new PrintWriter(new FileWriter("gradAccounts.txt"));
          Iterator it2;
          it2 = gradaccs.iterator();
          while(it2.hasNext()){
          q.println(it2.next());
          q.close();
     public static void readAccounts(String filename, TreeSet accs)
                    throws IOException
          Scanner sc = new Scanner(new FileReader(filename));
          String accName;     
          while (sc.hasNext())
               accName = sc.next();
               accs.add(accName);
}// end of classit will auto create a 2 text file and auto write the result to the txt file but i just need the name. Below is the gradAccounts.txt output:
1.89
1.98
2.00
2.21
2.33
2.34
2.44
2.49
2.56
2.67
2.76
2.78
2.88
2.89
3.00
3.10
3.23
3.33
3.43
3.44
3.50
3.67
3.76
3.79
3.88
4.00
Amenda
Boby
Brandon
CGPA
Cathy
Clark
David
Garry
ID
Jacky
Jasmine
Jimmy
Jonh
Julie
Kevin
Laura
Leo
Marry
Michael
Micheal
Name
Nim
Paula
Peter
Rachel
Rock
Rosetta
S0001
S0008
S0014
S0020
S0023
S0027
S0065
S0076
S0077
S0079
S0092
S0096
S0103
S0105
S0111
S0113
S0120
S0168
S0175
S0184
S0189
S0212
S0260
S0262
S0314
S0317
S0321
S0329
S0406
S0628
Sam
Sharon
Smith
Suki
Susan
Tom

Answer 1

Zclee wrote:
     public static void main(String [] args)throws Exception
I'm going to faint ...
kind regards,
Jos