Tax Calulator applet again pls help urgent

Question

why isn't it possible to pass a string and a double into GetResult below, i get a compilation error and right now i dunno how to proceed. GetRelief is supposed to calculate "relief" from textfields i/p and GetResult is suppose to calculate the "result" (minus "relief" from GetRelief). And is it the correct way to create an object as in calc = new Calculate(); below................any help would be greatly appreciated...
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class TaxCal extends Applet implements ActionListener {
     private TextField income, age, child, parent, course, maid, pay;
     private Button b2, b3;
     private Calculate calc;
     public void init() {
               setBackground(Color.lightGray);
               /* Create the input boxes, and make sure that the background
               color is white. (On some platforms, it is automatically.) */
               income = new TextField(10);
               Panel incomePanel = new Panel();
               incomePanel.setLayout(new BorderLayout(2,2));
               incomePanel.add( new Label("Input your annual income"), BorderLayout.WEST );
          incomePanel.add(income, BorderLayout.CENTER);
               age = new TextField(2);
               Panel agePanel = new Panel();
               agePanel.setLayout(new BorderLayout(2,2));
               agePanel.add( new Label("Input your age"), BorderLayout.WEST );
               agePanel.add(age, BorderLayout.CENTER);
               child = new TextField(2);
               Panel childPanel = new Panel();
               childPanel.setLayout(new BorderLayout(2,2));
               childPanel.add( new Label("Number of children"), BorderLayout.WEST );
               childPanel.add(child, BorderLayout.CENTER);
               parent = new TextField(1);
               Panel parentPanel = new Panel();
               parentPanel.setLayout(new BorderLayout(2,2));
               parentPanel.add( new Label("Number of parent that live with you"), BorderLayout.WEST );
               parentPanel.add(parent, BorderLayout.CENTER);
               course = new TextField(5);
               Panel coursePanel = new Panel();
               coursePanel.setLayout(new BorderLayout(2,2));
               coursePanel.add( new Label("Course fee"), BorderLayout.WEST );
               coursePanel.add(course, BorderLayout.CENTER);
               maid = new TextField(5);
               Panel maidPanel = new Panel();
               maidPanel.setLayout(new BorderLayout(2,2));
               maidPanel.add( new Label("Maid levy paid"), BorderLayout.WEST );
               maidPanel.add(maid, BorderLayout.CENTER);
               pay = new TextField(10);
               pay.setEditable(false);
               Panel payPanel = new Panel();
               payPanel.setLayout(new BorderLayout(2,2));
               payPanel.add( new Label("Please pay"), BorderLayout.WEST );
               payPanel.add(pay, BorderLayout.CENTER);
               Panel buttonPanel = new Panel();
               buttonPanel.setLayout(new GridLayout(1,3));
               Button b2 = new Button("Reset");
               b2.addActionListener(this);     // register listener
               buttonPanel.add(b2);
               Button b3 = new Button("Calculate");
               b3.addActionListener(this);     // register listener
               buttonPanel.add(b3);
               /* Set up the layout for the applet, using a GridLayout,
          and add all the components that have been created. */
          setLayout(new GridLayout(8,2));
               add(incomePanel);
               add(agePanel);
               add(childPanel);
               add(parentPanel);
          add(coursePanel);
          add(maidPanel);
          add(payPanel);
          add(buttonPanel);
          /* Try to give the input focus to xInput, which is
          the natural place for the user to start. */
          income.requestFocus();
          } // end init()
     public TaxCal() {
     calc = new Calculate();
     public Insets getInsets() {
// Leave some space around the borders of the applet.
     return new Insets(2,2,2,2);
     // event handler for ActionEvent
     public void actionPerformed (ActionEvent e) {
          String s = e.getActionCommand();
          if (s.equals("Calculate"))
               double relief = calc.GetRelief(age.getText(), child.getText(), parent.getText(), course.getText(), maid.getText());
               double result = calc.GetResult(income.getText(), relief);
               pay.setText(Double.toString(relief));
          else
               income.setText("");
               age.setText("");
               child.setText("");
               parent.setText("");
               course.setText("");
               maid.setText("");
               pay.setText("");
}     // end actionPerformed()
public class Calculate
private double result;
private double incomeTotal;
private double ageTotal;
private double childTotal;
private double parentTotal;
private double courseTotal;
private double maidTotal;
private double relief;
public Calculate()
relief = 0.0;
result = 0.0;
incomeTotal = 0;
ageTotal = 0;
childTotal = 0;
parentTotal = 0;
courseTotal = 0;
maidTotal = 0;
public double GetResult(String theincome, Double therelief)
     incomeTotal = Double.parseDouble(theincome);
     relief = therelief;
     incomeTotal =- relief;
     if (incomeTotal <= 7500)
     result = incomeTotal * .02;
     else if (incomeTotal > 7500 && incomeTotal <= 20000)
     result = 150 + ((incomeTotal - 7500) * .05);
     else if (incomeTotal > 20000 && incomeTotal <= 35000)
     result = ((incomeTotal - 20000) * .08) + 775;
     else if (incomeTotal> 35000 && incomeTotal <= 50000)
     result = ((incomeTotal - 35000) * .12) + 1975;
     else if (incomeTotal > 50000 && incomeTotal <= 75000)
     result = ((incomeTotal - 50000) * .16) + 3775;
     else if (incomeTotal > 75000 && incomeTotal <= 100000)
     result = ((incomeTotal - 75000) * .2) + 7775;
     else if (incomeTotal > 100000 && incomeTotal <= 150000)
     result = ((incomeTotal - 100000) * .22) + 12775;
     else if (incomeTotal > 150000 && incomeTotal <= 200000)
     result = ((incomeTotal - 150000) * .23) + 23775;
     else if (incomeTotal > 200000 && incomeTotal <= 400000)
     result = ((incomeTotal - 200000) * .26) + 35275;
     else if (incomeTotal > 400000)
     result = ((incomeTotal - 400000) * .28) + 87275;
     return result;
public double GetRelief(String theage, String thechild, String theparent, String thecourse, String themaid)
     ageTotal = Double.parseDouble(theage);
     parentTotal = Double.parseDouble(theparent);
     maidTotal = Double.parseDouble(themaid);
     childTotal = Double.parseDouble(thechild);
     courseTotal = Double.parseDouble(thecourse);
                         //determine age relief
                         if(ageTotal<55)
                         relief += 3000;
                         else if(ageTotal>=55 && ageTotal<= 59)
                         relief += 8000;
                         else
                         relief += 10000;
                         //determine children relief
                         if(childTotal<=3)
                         relief += (childTotal*2000);
                         else if(childTotal>3 && childTotal<6)
                         relief += ((childTotal-3)*500 + 6000);
                         else
                         relief += 0;
                         //determine parent relief
                         if(parentTotal == 1)
                         relief += 3000;
                         else if(parentTotal ==2)
                         relief += 6000;
                         else
                         relief += 0;
                         //determine course subsidy
                         if(courseTotal != 0 ) {
                              if(courseTotal <= 2500)
                              relief += courseTotal;
                              else
                              relief += 2500;
                         //determine maid levy
                         if(maidTotal != 0) {
                              if(maidTotal <= 4000)
                              relief += 2 * maidTotal;
                              else
                              relief += 0;
return relief;
} // end of class Calculate
}      // end class TaxCal

Answer 1

You're probably not getting anything to show up because in your actionPerformed() method, b3 has not been initialized.
You declare static variables:
Button b2, b3;
but then in your init() method, you delare new local variables when you specify:
Button b2 = new Button(...);
Button b3 = new Button(...);
Since you're declaring and initializing the new local variables, you have never set the static variables to any values. Try removing the type declaration for b2 and b3 in your init() method as follows:
b2 = new Button(...)
b3 = new Button(...)
Hope this helps!