Thanks for the help.

Element is an object of class Site
import java.io.*;
import java.net.*;
import java.io.Serializable;
import java.util.*;

public class Site implements Serializable{
public int PId;
public long TimeStamp;
// public ArrayList Queue = new ArrayList();

public Site(int pid, long timestamp){
    PId = pid;
    TimeStamp = timestamp;
    System.out.println("My ProcessId is "+PId);
    System.out.println("My TimeStamp is "+TimeStamp);

}
}

class RequestQueue{
   public ArrayList Queue = new ArrayList();
   public Site SObj;
   public Site Element;
   public Hashtable ReqHash = new Hashtable();
   public TreeMap ReqHashSorted = null;
   public Site foo;
   public RequestQueue(Site sobj){
       SObj = sobj;
       /* Get the object and add it to the queue */
       Queue.add(SObj);
       for(Iterator It = Queue.iterator();It.hasNext();)
       {
           Element =(Site)It.next();
           System.out.println("The element is "+Element.PId);
           System.out.println("The element is "+Element.TimeStamp);
           ReqHash.put(new Long(Element.TimeStamp),new
Integer(Element.PId));
       }
       ReqHashSorted = new TreeMap(ReqHash);
       Iterator HashIt = ReqHashSorted.keySet().iterator();
       while(HashIt.hasNext())
       {
           foo = (Site)ReqHashSorted.get(HashIt.next());
           System.out.println("The smallest TimeStamp is "+foo.PId );
           System.out.println("The processid corres to smallest
TimeStamp is "+foo.TimeStamp );
       }
  }
   
   
}

Here are the two classes that I am working with.
Thanks.