class ExpPanel extends Panel
                     implements ActionListener,
                                 AdjustmentListener {
    TScore     controller;
    TextField  exT;
    Scrollbar  sB;
    Label      sumL;
    int        max = 100;
    int        block = 1;
    float      ff,ss;
    int        rr,cc;

    ExpPanel(TScore u,String t,
             int x,float a,float b,int m,int n) {
        GridBagConstraints   c = new GridBagConstraints();
        GridBagLayout        gridbag = new GridBagLayout();
        setLayout(gridbag);
        int tmp_i;

        controller = u;
        ss = a; ff = b; cc = m; rr = n;
        float sf_ratio =  (float)ss / (float)ff;
        tmp_i = (int)(10000 * sf_ratio);
        float sf_percent =  (float)tmp_i / (float)100.0;
        float sum_ratio = (float)(ss + ((float)rr*ff*sf_ratio/(float)cc)) / (float)(ff*(1.0 + (float)rr/(float)cc));
        tmp_i = (int)(10000 * sum_ratio);
        float sum_percent =  (float)tmp_i / (float)100.0;

        String cs = " " + ss + "/"  + ff; 
        cs = cs + " = " + sf_percent + "%";
        String r = "remaining " + rr + " sets at (%) ";
        String s = " " + sum_percent + "%";

        //Set up default layout constraints.
        c.fill = GridBagConstraints.NONE;

        Label tL = new Label(t, Label.LEFT);
        // c.gridwidth = GridBagConstraints.REMAINDER; //It ends a row.
        c.gridwidth = 1;
        c.gridx = 0;
        c.gridy = 0;
        gridbag.setConstraints(tL, c);
        add(tL);
        
        Label cL = new Label(cs, Label.CENTER);
        c.gridwidth = 2;
        c.gridx = 1;
        c.gridy = 0;
        gridbag.setConstraints(cL, c);
        add(cL);

        Label sL = new Label("subtotal=", Label.RIGHT);
        c.gridwidth = 1;
        c.gridx = 3;
        c.gridy = 0;
        gridbag.setConstraints(sL, c);
        add(sL);

        sumL = new Label(s, Label.RIGHT);
        c.gridwidth = GridBagConstraints.REMAINDER; //It ends a row.
        c.gridx = 4;
        c.gridy = 0;
        gridbag.setConstraints(sumL, c);
        add(sumL);
        if(x==1) { 
          Label rL = new Label(r, Label.RIGHT);
          c.gridwidth = 2;
          c.gridx = 0;
          c.gridy = 1;
          gridbag.setConstraints(rL, c);
          add(rL);

          exT = new TextField("0", 3);
          c.anchor = GridBagConstraints.EAST;
          c.gridwidth = 1; //The default value.
          c.gridx = 2;
          c.gridy = 1;
          gridbag.setConstraints(exT, c);
          add(exT);
          exT.addActionListener(this);
          c.anchor = GridBagConstraints.CENTER;  // default

        //Add the slider.  It's horizontal, and it has the maximum
        //value specified by the instance variable max.  Its initial
        //and minimum values are the default (0).  A click increments
        //the value by block units.
          sB = new Scrollbar(Scrollbar.HORIZONTAL);
          sB.setMaximum(max + 10);
          sB.setBlockIncrement(block);
          // c.gridwidth = GridBagConstraints.REMAINDER; //It ends a row.
          c.fill = GridBagConstraints.HORIZONTAL;
          c.gridwidth = 2;
          c.gridx = 3;
          c.gridy = 1;
          gridbag.setConstraints(sB, c);
          add(sB);
          sB.addAdjustmentListener(this);
          exT.setText(String.valueOf(sf_percent));
          sB.setValue((int)sf_percent);
        }

    }
    // Draws a box around this panel. 
    public void paint(Graphics g) {
        Dimension d = getSize();
        g.drawRect(0,0, d.width - 1, d.height - 1);
    }
    public Insets getInsets() {
        return new Insets(5,5,5,8);
    }
    float  getSubTotal() {
        String s_str = sumL.getText().replace('%','\0').trim();
        float  s_real = Float.valueOf(s_str).floatValue();
        return (s_real);
    }
    double getValue() {
        double f;
        try {
            f = (double)Double.valueOf(exT.getText()).doubleValue();
        } catch (java.lang.NumberFormatException e) {
            f = 0.0;
        }
        return f;
    }
    // entered into exT
    public void actionPerformed(ActionEvent e) {
        int tf = (int) getValue();
        if (tf > max)
            tf = max;
        if (tf < 0)
            tf = 0;
        sB.setValue(tf);
        exT.setText(String.valueOf((int)tf));
        recalcSumm(tf);
    }    
    //  slider sB changed
    public void adjustmentValueChanged(AdjustmentEvent e) {
        Scrollbar source = (Scrollbar)e.getSource();
           int   my_i =  (int)source.getValue();
           exT.setText(String.valueOf(e.getValue()));
           recalcSumm(my_i);
    }
    void  recalcSumm(int tf) {
        float my_r = (float) tf / (float)100.0;
        int  tmp_i= (int)(10000*(ss+(rr*ff*my_r/cc))/(float)(ff*(1.0+rr/cc)));
        float sum  = (float)tmp_i / (float)100.0;
        sumL.setText(sum + "%");
        controller.recalcTermScore();
    }
    // Set the values in the slider and text field. 
    void setValue(double f) {
        setSliderValue(f);
        exT.setText(String.valueOf((float)f));
    }
    void setSliderValue(double f) {
        int sliderValue = (int)f;

        if (sliderValue > max)
               sliderValue = max;
        if (sliderValue < 0)
            sliderValue = 0;
        sB.setValue(sliderValue);
        
    }
}
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>