Compiles but does not execute as expected????

Question

Here is my code. I can compile and execute but does not perform as expected What do I need to change?
import java.io.;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.math.*;
public class CalcTest extends JFrame implements ActionListener, ItemListener
public JMenuBar createMenuBar()
        JMenuBar mnuBar = new JMenuBar();
        setJMenuBar(mnuBar);
            //Create File & add Exit
        JMenu mnuFile = new JMenu("File", true);
        mnuFile.setMnemonic(KeyEvent.VK_F);
        mnuFile.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuFile);
        JMenuItem mnuFileExit = new JMenuItem("Exit");
        mnuFileExit.setMnemonic(KeyEvent.VK_F);
        mnuFileExit.setDisplayedMnemonicIndex(1);
        mnuFile.add(mnuFileExit);
        mnuFileExit.setActionCommand("Exit");
        mnuFileExit.addActionListener(this);
        JMenu mnuFunction = new JMenu("Function", true);
        mnuFunction.setMnemonic(KeyEvent.VK_F);
        mnuFunction.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuFunction);
       JMenuItem mnuFunctionClear = new JMenuItem("Clear");
       mnuFunctionClear.setMnemonic(KeyEvent.VK_F);
       mnuFunctionClear.setDisplayedMnemonicIndex(1);
       mnuFunction.add(mnuFunctionClear);
       mnuFunctionClear.setActionCommand("Clear");
       mnuFunctionClear.addActionListener(this);
        // Fields for Principle 
  JPanel row1 = new JPanel();
  JLabel dollar = new JLabel("How much are you borrowing?"); 
  JTextField money = new JTextField("", 15);
        // Fields for Term and Rate
   JPanel row2 = new JPanel();
   JLabel choice = new JLabel("Select Year & Rate:");
   JCheckBox altchoice = new JCheckBox("Alt. Method");
   JTextField YR = new JTextField("", 4);
   JTextField RT = new JTextField("", 4);
       //Jcombobox R=rate,Y=year
   String[] RY =  {   
        "7 years at 5.35%", "15 years at 5.5 %", "30 years at 5.75%", " "  
  JComboBox mortgage = new JComboBox(RY);
            // Fields for Payment   
    JPanel row3 = new JPanel(); 
    JLabel payment = new JLabel("Your monthly payment will be:");
    JTextField owe = new JTextField(" ", 15); 
          //Scroll Pane and Text Area
   JPanel row4 = new JPanel();
   JLabel amortization = new JLabel("Amortization:");
   JTextArea chart = new JTextArea(" ", 7, 22); 
   JScrollPane scroll = new JScrollPane(chart, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,  
                                           JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);  
    StringBuffer amt = new StringBuffer();
    Container pane = getContentPane(); 
    FlowLayout flow = new FlowLayout(FlowLayout.LEFT);
    JButton Cal = new JButton("Calculate"); 
    NumberFormat currency = NumberFormat.getCurrencyInstance();  
  public CalcTest() 
           // Title and Exit of JFrame  
     super("Mortgage and Amortization Calculator"); 
     setSize(475, 328);  
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
            //JFrame layout      
     pane.setLayout(flow);     
           //Input output fields added to JFrame  
     row1.add(dollar);    
     row1.add(money);   
     pane.add(row1);    
     mortgage.setSelectedIndex(3);   
     mortgage.addActionListener(this);    
     mortgage.setActionCommand("mortgage");
     row2.add(altchoice);     
     altchoice.addItemListener(this);  
     row2.add(choice);     
     YR.setEditable(false);    
     RT.setEditable(false);     
     row2.add(YR);     
     row2.add(RT);      
     row2.add(mortgage);    
     pane.add(row2);     
     row3.add(payment);   
     row3.add(owe);       
     pane.add(row3);      
     owe.setEditable(false);  
             //Scroll Pane added to JFrame     
      row4.add(amortization);      
      chart.setEditable(false); 
      row4.add(scroll);   
      pane.add(row4);     
            //Executable Button- Clear,Exit, Calculate 
      JPanel row5 = new JPanel();
      JButton clear = new JButton("Clear");  
      clear.addActionListener(this);     
      row5.add(clear); 
      pane.add(row5); 
      JButton exit = new JButton("Exit"); 
      exit.addActionListener(this);    
      row5.add(exit);      
      Cal.setEnabled(false);  
      Cal.addActionListener(this); 
      row5.add(Cal);       
      pane.add(row5);   
      setContentPane(pane);   
      setVisible(true); 
  }                    //End of constructor   
    private void calculate()
      String loanAmount = money.getText(); 
         if(loanAmount.equals(""))      
           return;      
           double P = Double.parseDouble(loanAmount);     
           int y;     
           double r;    
         if(altchoice.isSelected())   
          if(YR.getText().equals("") || RT.getText().equals(""))  
             return;        
           y = Integer.parseInt(YR.getText());     
            r = Double.parseDouble(RT.getText());   
           else     
              int index = mortgage.getSelectedIndex();  
              if(index == 3)         
              return;          
              int[] terms = { 7, 15, 30 };     
              double[] rates = { 5.5, 5.35, 5.75 }; 
              y = terms[index];  
              r = rates[index];  
              double In = r / (100 * 12.0);  
              double M = P * (In / (1 - Math.pow(In + 1, -12.0 * y)));
              owe.setText(currency.format(M));      
                     //Column Titles for Text Area     
       chart.setText("Pmt#\tPrincipal\tInterest\tBalance\n");  
     for (int i = 0; i < y * 12; i++)     
  {            double interestAccrued = P * In;     
               double principalPaid = M - interestAccrued;          
               chart.append(i + 1 + "\t" + currency.format(principalPaid)           
                                + "\t" + currency.format(interestAccrued)     
                                      + "\t" + currency.format(P) + "\n");      
                P = P + interestAccrued - M;   
     public void itemStateChanged(ItemEvent ie) 
  {        int status = ie.getStateChange();    
       if (status == ItemEvent.SELECTED)     
           mortgage.setEnabled(false);  
           YR.setEditable(true); 
           RT.setEditable(true);   
           Cal.setEnabled(true);  
        else 
        mortgage.setEnabled(true); 
        YR.setEditable(false);    
        RT.setEditable(false);     
       Cal.setEnabled(false);     
  public void actionPerformed(ActionEvent ae)//Calculations and Button executions
      String command = ae.getActionCommand();  
              // Exit program      
       if (command.equals("Exit"))   
        System.exit(0);
              // Cal button 
      if (command.equals("Calculate") || command.equals("mortgage")) 
          calculate();      
             // Clear fields  
      if (command.equals("Clear")) 
         money.setText(null);
         mortgage.setSelectedIndex(3); 
         owe.setText(null);   
         chart.setText(null); 
}             //End actionPerformed 
   public static void main(String args[]) throws IOException
           new CalcTest();
[/Code]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

Here is the code again
import java.io.;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;
import java.math.*;
public class CalcTest extends JFrame implements ActionListener, ItemListener
public JMenuBar createMenuBar()
        JMenuBar mnuBar = new JMenuBar();
        setJMenuBar(mnuBar);
            //Create File & add Exit
        JMenu mnuFile = new JMenu("File", true);
        mnuFile.setMnemonic(KeyEvent.VK_F);
        mnuFile.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuFile);
        JMenuItem mnuFileExit = new JMenuItem("Exit");
        mnuFileExit.setMnemonic(KeyEvent.VK_F);
        mnuFileExit.setDisplayedMnemonicIndex(1);
        mnuFile.add(mnuFileExit);
        mnuFileExit.setActionCommand("Exit");
        mnuFileExit.addActionListener(this);
        JMenu mnuFunction = new JMenu("Function", true);
        mnuFunction.setMnemonic(KeyEvent.VK_F);
        mnuFunction.setDisplayedMnemonicIndex(0);
        mnuBar.add(mnuFunction);
       JMenuItem mnuFunctionClear = new JMenuItem("Clear");
       mnuFunctionClear.setMnemonic(KeyEvent.VK_F);
       mnuFunctionClear.setDisplayedMnemonicIndex(1);
       mnuFunction.add(mnuFunctionClear);
       mnuFunctionClear.setActionCommand("Clear");
       mnuFunctionClear.addActionListener(this);
        // Fields for Principle 
  JPanel row1 = new JPanel();
  JLabel dollar = new JLabel("How much are you borrowing?"); 
  JTextField money = new JTextField("", 15);
        // Fields for Term and Rate
   JPanel row2 = new JPanel();
   JLabel choice = new JLabel("Select Year & Rate:");
   JCheckBox altchoice = new JCheckBox("Alt. Method");
   JTextField YR = new JTextField("", 4);
   JTextField RT = new JTextField("", 4);
       //Jcombobox R=rate,Y=year
   String[] RY =  {   
        "7 years at 5.35%", "15 years at 5.5 %", "30 years at 5.75%", " "  
  JComboBox mortgage = new JComboBox(RY);
            // Fields for Payment   
    JPanel row3 = new JPanel(); 
    JLabel payment = new JLabel("Your monthly payment will be:");
    JTextField owe = new JTextField(" ", 15); 
          //Scroll Pane and Text Area
   JPanel row4 = new JPanel();
   JLabel amortization = new JLabel("Amortization:");
   JTextArea chart = new JTextArea(" ", 7, 22); 
   JScrollPane scroll = new JScrollPane(chart, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,  
                                           JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);  
    StringBuffer amt = new StringBuffer();
    Container pane = getContentPane(); 
    FlowLayout flow = new FlowLayout(FlowLayout.LEFT);
    JButton Cal = new JButton("Calculate"); 
    NumberFormat currency = NumberFormat.getCurrencyInstance();  
  public CalcTest() 
           // Title and Exit of JFrame  
     super("Mortgage and Amortization Calculator"); 
     setSize(475, 328);  
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
            //JFrame layout      
     pane.setLayout(flow);     
           //Input output fields added to JFrame  
     row1.add(dollar);    
     row1.add(money);   
     pane.add(row1);    
     mortgage.setSelectedIndex(3);   
     mortgage.addActionListener(this);    
     mortgage.setActionCommand("mortgage");
     row2.add(altchoice);     
     altchoice.addItemListener(this);  
     row2.add(choice);     
     YR.setEditable(false);    
     RT.setEditable(false);     
     row2.add(YR);     
     row2.add(RT);      
     row2.add(mortgage);    
     pane.add(row2);     
     row3.add(payment);   
     row3.add(owe);       
     pane.add(row3);      
     owe.setEditable(false);  
             //Scroll Pane added to JFrame     
      row4.add(amortization);      
      chart.setEditable(false); 
      row4.add(scroll);   
      pane.add(row4);     
            //Executable Button- Clear,Exit, Calculate 
      JPanel row5 = new JPanel();
      JButton clear = new JButton("Clear");  
      clear.addActionListener(this);     
      row5.add(clear); 
      pane.add(row5); 
      JButton exit = new JButton("Exit"); 
      exit.addActionListener(this);    
      row5.add(exit);      
      Cal.setEnabled(false);  
      Cal.addActionListener(this); 
      row5.add(Cal);       
      pane.add(row5);   
      setContentPane(pane);   
      setVisible(true); 
  }                    //End of constructor   
    private void calculate()
      String loanAmount = money.getText(); 
         if(loanAmount.equals(""))      
           return;      
           double P = Double.parseDouble(loanAmount);     
           int y;     
           double r;    
         if(altchoice.isSelected())   
          if(YR.getText().equals("") || RT.getText().equals(""))  
             return;        
           y = Integer.parseInt(YR.getText());     
            r = Double.parseDouble(RT.getText());   
           else     
              int index = mortgage.getSelectedIndex();  
              if(index == 3)         
              return;          
              int[] terms = { 7, 15, 30 };     
              double[] rates = { 5.5, 5.35, 5.75 }; 
              y = terms[index];  
              r = rates[index];  
              double In = r / (100 * 12.0);  
              double M = P * (In / (1 - Math.pow(In + 1, -12.0 * y)));
              owe.setText(currency.format(M));      
                     //Column Titles for Text Area     
       chart.setText("Pmt#\tPrincipal\tInterest\tBalance\n");  
     for (int i = 0; i < y * 12; i++)     
  {            double interestAccrued = P * In;     
               double principalPaid = M - interestAccrued;          
               chart.append(i + 1 + "\t" + currency.format(principalPaid)           
                                + "\t" + currency.format(interestAccrued)     
                                      + "\t" + currency.format(P) + "\n");      
                P = P + interestAccrued - M;   
     public void itemStateChanged(ItemEvent ie) 
  {        int status = ie.getStateChange();    
       if (status == ItemEvent.SELECTED)     
           mortgage.setEnabled(false);  
           YR.setEditable(true); 
           RT.setEditable(true);   
           Cal.setEnabled(true);  
        else 
        mortgage.setEnabled(true); 
        YR.setEditable(false);    
        RT.setEditable(false);     
       Cal.setEnabled(false);     
  public void actionPerformed(ActionEvent ae)//Calculations and Button executions
      String command = ae.getActionCommand();  
              // Exit program      
       if (command.equals("Exit"))   
        System.exit(0);
              // Cal button 
      if (command.equals("Calculate") || command.equals("mortgage")) 
          calculate();      
             // Clear fields  
      if (command.equals("Clear")) 
         money.setText(null);
         mortgage.setSelectedIndex(3); 
         owe.setText(null);   
         chart.setText(null); 
}             //End actionPerformed 
   public static void main(String args[]) throws IOException
           new CalcTest();