Keeping the balance

Question

I have two lists, one for stocks bought and one for stocks sold. I now want to keep track whether the strategy is making or loosing money.public void startPeriodicDownload(){
        int delay = 5000;   // delay for 5 sec.
        int period = 1000*10;  // repeat every min.
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            public void run() {
                RetrieveAndSaveFile("http://www.efg.eurosport.com/efg/shares.jsp");
                ReadFile("/temp.txt");
                extractData();
                for(int x=0; x<team.length-1;x++){
                    if(x==0){
                        team[x].addPrice(Double.parseDouble(teamPrice.getItem(x+1)));
                    }else{
                        team[x].addPrice(Double.parseDouble(teamPrice.getItem(x*2+1)));
                    UpdateBuyList(x);
                    UpdateSellList(x);
                NumberFormat formatter = new DecimalFormat("0.00");
                String s = formatter.format(investments);
                lblInvestments.setText("$"+s);
                s = formatter.format(balance);
                lblBalance.setText("$"+s);
                s = formatter.format(total);
                lblTotal.setText("$"+s);
                downloadCounter++;
                System.out.println("Time " +downloadCounter+ ":" + new Timestamp(System.currentTimeMillis()));
        }, delay, period);
    private void UpdateBuyList(int teamNumber){
        if((team[teamNumber].Buy())&&!( buyModel.contains(team[teamNumber].getTeamName() ) ) ){
            buyModel.add(0, team[teamNumber].getTeamName());
            double lotCost=10*team[teamNumber].getCurrentPrice();
            if(balance>lotCost){
                balance-=lotCost;
                investments+=lotCost;
                total=balance+investments;
                txtInvestments.append(team[teamNumber].getTeamName() + " bought @$" +lotCost+"\n");
    private void UpdateSellList(int teamNumber){
        int index = buyModel.indexOf(team[teamNumber].getTeamName());
        if(index!=-1){
            if(team[teamNumber].Sell()){
                int pos = sellList.getModel().getSize();
                sellModel.add(pos,buyModel.getElementAt(index));
                buyModel.remove(index);
                double lotCost=10*team[teamNumber].getCurrentPrice();
                balance+=lotCost;
                investments-=lotCost;
                total=balance+investments;
                txtInvestments.append(team[teamNumber].getTeamName() + " sold @$" +lotCost+"\n");
    private double total = 0;
    private double balance = 20000;
    private double investments = 0;Unfortunately when I run the program the updates arn't showing because I have a list showing the bought prices and the sold prices and can see that there should be a difference in the total but it does not show up and simply keeps the balance at 20000?????

Answer 1

Like I mentioned I have a list that shows all the transactionstxtInvestments.append(team[teamNumber].getTeamName() + " sold @$" +lotCost+"\n");&txtInvestments.append(team[teamNumber].getTeamName() + " bought @$" +lotCost+"\n");This shows that the value being added or subtract from iwther investments or balance is changing. Somehow though the value i not changing the total. I have a variable(lotCost) that does change and is being printed. The total, balance and investments also get printed to the screenNumberFormat formatter = new DecimalFormat("0.00");
                String s = formatter.format(investments);
                lblInvestments.setText("$"+s);
                s = formatter.format(balance);
                lblBalance.setText("$"+s);
                s = formatter.format(total);
                lblTotal.setText("$"+s);
                downloadCounter++;
                System.out.println("Time " +downloadCounter+ ":" + new Timestamp(System.currentTimeMillis()));This shows that changes are occuring in all the proper places. I thnk you may be right in the fact that my maths is a bit skwang and this is what I kindly request you to help me with.
if(balance>lotCost){
                balance-=lotCost;
                investments+=lotCost;
                total=balance+investments;
                txtInvestments.append(team[teamNumber].getTeamName() + " bought @$" +lotCost+"\n");
if(team[teamNumber].Sell()){
                int pos = sellList.getModel().getSize();
                sellModel.add(pos,buyModel.getElementAt(index));
                buyModel.remove(index);
                double lotCost=10*team[teamNumber].getCurrentPrice();
                balance+=lotCost;
                investments-=lotCost;
                total=balance+investments;
                txtInvestments.append(team[teamNumber].getTeamName() + " sold @$" +lotCost+"\n");
            }I think the problem is in the italized part but I can't seem to pin point the little monster.:
Buy:
balance-=lotCost;
investments+=lotCost;
total=balance+investments;
Sell:
balance+=lotCost;
investments-=lotCost;
total=balance+investments;