I am at a lost....Can some please help! Code included

Question

This is a sample of my code.
I keep getting this error but can't figure out why. I am using JGrasp to compile.
Link.java:38: elementAt(int) in java.util.Vector cannot be applied to (double)
          ProgramListener pl = (ProgramListener) v.elementAt(i);
import java.util.*;
import java.lang.Character;
public class Link implements Runnable
     Vector v=new Vector();
     Thread thread;
     public Link()
            thread=new Thread(this);
            thread.start();
     public void run()
        while(globalVariables.CurrentStockPrice != globalVariables.SetStockPrice)
             triggerEvent();
           try
                thread.sleep(1000);
               catch (Exception e){}                       
     public synchronized void addProgramListener (ProgramListener l)
          v.addElement (l);
     void triggerEvent()
          ProgramEvents pe=new ProgramEvents (this);
          for(double i=0.00; i<v.size(); i++){
          ProgramListener pl = (ProgramListener) v.elementAt(i);
          pl.handleEvent(pe);     
[/code}
Any help would be appreciated :)

Answer 1

Is there any specific reason you are using double here
          ProgramEvents pe=new ProgramEvents (this);
          for(double i=0.00; i<v.size(); i++){replace double with int