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The program builds but will not calculate

I am new to java and am taking a java class, where I have to make a mortgage calculator allowing the user to either enter all info, principal, term and interest or enter the principal and then use a predefined term and interest rate. Thus far I have the layout and have begun to work on the "predefined" variables. I am using a combo box to allow the user to select the term which will then select the interest. However, when I choose the term through the combo box I recieve an error a bunch of errors in the netbeans IDE. But I cannot figure them out. Can someone please revice the code and tell me what I have done wrong.

Thx
/*
 * CalculatorView.java
 */
 
package calculator;
 
import org.jdesktop.application.Action;
import org.jdesktop.application.ResourceMap;
import org.jdesktop.application.SingleFrameApplication;
import org.jdesktop.application.FrameView;
import org.jdesktop.application.TaskMonitor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
import javax.swing.Icon;
import javax.swing.JDialog;
import javax.swing.JFrame;
 
/**
 * The application's main frame.
 */
public class CalculatorView extends FrameView {
 
    public CalculatorView(SingleFrameApplication app) {
        super(app);
 
        initComponents();
 
        // status bar initialization - message timeout, idle icon and busy animation, etc
        ResourceMap resourceMap = getResourceMap();
        int messageTimeout = resourceMap.getInteger("StatusBar.messageTimeout");
        messageTimer = new Timer(messageTimeout, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                statusMessageLabel.setText("");
            }
        });
        messageTimer.setRepeats(false);
        int busyAnimationRate = resourceMap.getInteger("StatusBar.busyAnimationRate");
        for (int i = 0; i < busyIcons.length; i++) {
            busyIcons[i] = resourceMap.getIcon("StatusBar.busyIcons[" + i + "]");
        }
        busyIconTimer = new Timer(busyAnimationRate, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                busyIconIndex = (busyIconIndex + 1) % busyIcons.length;
                statusAnimationLabel.setIcon(busyIcons[busyIconIndex]);
            }
        });
        idleIcon = resourceMap.getIcon("StatusBar.idleIcon");
        statusAnimationLabel.setIcon(idleIcon);
        progressBar.setVisible(false);
 
        // connecting action tasks to status bar via TaskMonitor
        TaskMonitor taskMonitor = new TaskMonitor(getApplication().getContext());
        taskMonitor.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
            public void propertyChange(java.beans.PropertyChangeEvent evt) {
                String propertyName = evt.getPropertyName();
                if ("started".equals(propertyName)) {
                    if (!busyIconTimer.isRunning()) {
                        statusAnimationLabel.setIcon(busyIcons[0]);
                        busyIconIndex = 0;
                        busyIconTimer.start();
                    }
                    progressBar.setVisible(true);
                    progressBar.setIndeterminate(true);
                } else if ("done".equals(propertyName)) {
                    busyIconTimer.stop();
                    statusAnimationLabel.setIcon(idleIcon);
                    progressBar.setVisible(false);
                    progressBar.setValue(0);
                } else if ("message".equals(propertyName)) {
                    String text = (String)(evt.getNewValue());
                    statusMessageLabel.setText((text == null) ? "" : text);
                    messageTimer.restart();
                } else if ("progress".equals(propertyName)) {
                    int value = (Integer)(evt.getNewValue());
                    progressBar.setVisible(true);
                    progressBar.setIndeterminate(false);
                    progressBar.setValue(value);
                }
            }
        });
    }
    
    @Action
    public void showAboutBox() {
        if (aboutBox == null) {
            JFrame mainFrame = CalculatorApp.getApplication().getMainFrame();
            aboutBox = new CalculatorAboutBox(mainFrame);
            aboutBox.setLocationRelativeTo(mainFrame);
        }
        CalculatorApp.getApplication().show(aboutBox);
    }
 
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
 
        mainPanel = new javax.swing.JPanel();
        bx_term = new javax.swing.JComboBox(terms);
        txtfld_term1 = new javax.swing.JLabel();
        label_interestauto = new javax.swing.JLabel();
        label_yearsauto = new javax.swing.JLabel();
        txtfld_principal = new javax.swing.JTextField();
        Principal = new javax.swing.JLabel();
        term = new javax.swing.JLabel();
        txtfld_term = new javax.swing.JTextField();
        label_interest = new javax.swing.JLabel();
        txtfld_interest = new javax.swing.JTextField();
        Principal1 = new javax.swing.JLabel();
        txtfld_principal1 = new javax.swing.JTextField();
        menuBar = new javax.swing.JMenuBar();
        javax.swing.JMenu fileMenu = new javax.swing.JMenu();
        javax.swing.JMenuItem exitMenuItem = new javax.swing.JMenuItem();
        javax.swing.JMenu helpMenu = new javax.swing.JMenu();
        javax.swing.JMenuItem aboutMenuItem = new javax.swing.JMenuItem();
        statusPanel = new javax.swing.JPanel();
        javax.swing.JSeparator statusPanelSeparator = new javax.swing.JSeparator();
        statusMessageLabel = new javax.swing.JLabel();
        statusAnimationLabel = new javax.swing.JLabel();
        progressBar = new javax.swing.JProgressBar();
 
        mainPanel.setName("mainPanel"); // NOI18N
 
        bx_term.setName("bx_term"); // NOI18N
 
        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(calculator.CalculatorApp.class).getContext().getResourceMap(CalculatorView.class);
        txtfld_term1.setText(resourceMap.getString("txtfld_term1.text")); // NOI18N
        txtfld_term1.setName("txtfld_term1"); // NOI18N
 
        label_interestauto.setText(resourceMap.getString("label_interestauto.text")); // NOI18N
        label_interestauto.setName("label_interestauto"); // NOI18N
 
        label_yearsauto.setText(resourceMap.getString("label_yearsauto.text")); // NOI18N
        label_yearsauto.setName("label_yearsauto"); // NOI18N
 
        txtfld_principal.setText(resourceMap.getString("txtfld_principal.text")); // NOI18N
        txtfld_principal.setName("txtfld_principal"); // NOI18N
 
        Principal.setText(resourceMap.getString("Principal.text")); // NOI18N
        Principal.setName("Principal"); // NOI18N
 
        term.setText(resourceMap.getString("term.text")); // NOI18N
        term.setName("term"); // NOI18N
 
        txtfld_term.setText(resourceMap.getString("txtfld_term.text")); // NOI18N
        txtfld_term.setName("txtfld_term"); // NOI18N
 
        label_interest.setText(resourceMap.getString("label_interest.text")); // NOI18N
        label_interest.setName("label_interest"); // NOI18N
 
        txtfld_interest.setText(resourceMap.getString("txtfld_interest.text")); // NOI18N
        txtfld_interest.setName("txtfld_interest"); // NOI18N
 
        Principal1.setText(resourceMap.getString("Principal1.text")); // NOI18N
        Principal1.setName("Principal1"); // NOI18N
 
        txtfld_principal1.setName("txtfld_principal1"); // NOI18N
 
        javax.swing.GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
        mainPanel.setLayout(mainPanelLayout);
        mainPanelLayout.setHorizontalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainPanelLayout.createSequentialGroup()
                .addGap(33, 33, 33)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(label_yearsauto)
                    .addComponent(label_interestauto)
                    .addComponent(bx_term, javax.swing.GroupLayout.PREFERRED_SIZE, 69, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(txtfld_term1)
                    .addComponent(Principal1)
                    .addComponent(txtfld_principal1, javax.swing.GroupLayout.DEFAULT_SIZE, 91, Short.MAX_VALUE))
                .addGap(121, 121, 121)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(txtfld_principal, javax.swing.GroupLayout.PREFERRED_SIZE, 98, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(Principal)
                    .addComponent(term)
                    .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                        .addComponent(txtfld_term, javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(txtfld_interest, javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(label_interest, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                .addContainerGap(76, Short.MAX_VALUE))
        );
        mainPanelLayout.setVerticalGroup(
            mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainPanelLayout.createSequentialGroup()
                .addGap(23, 23, 23)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(Principal1)
                    .addComponent(Principal))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(txtfld_principal1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(txtfld_principal, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(txtfld_term1)
                    .addComponent(term))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(bx_term, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(txtfld_term, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(label_interestauto, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(label_interest))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(label_yearsauto)
                    .addComponent(txtfld_interest, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(150, Short.MAX_VALUE))
        );
 
        /** create our event handler for our combo box **/
        bx_term.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                HandleComboBox(evt);
            }
        });
 
        menuBar.setName("menuBar"); // NOI18N
 
        fileMenu.setText(resourceMap.getString("fileMenu.text")); // NOI18N
        fileMenu.setName("fileMenu"); // NOI18N
 
        javax.swing.ActionMap actionMap = org.jdesktop.application.Application.getInstance(calculator.CalculatorApp.class).getContext().getActionMap(CalculatorView.class, this);
        exitMenuItem.setAction(actionMap.get("quit")); // NOI18N
        exitMenuItem.setName("exitMenuItem"); // NOI18N
        fileMenu.add(exitMenuItem);
 
        menuBar.add(fileMenu);
 
        helpMenu.setText(resourceMap.getString("helpMenu.text")); // NOI18N
        helpMenu.setName("helpMenu"); // NOI18N
 
        aboutMenuItem.setAction(actionMap.get("showAboutBox")); // NOI18N
        aboutMenuItem.setName("aboutMenuItem"); // NOI18N
        helpMenu.add(aboutMenuItem);
 
        menuBar.add(helpMenu);
 
        statusPanel.setName("statusPanel"); // NOI18N
 
        statusPanelSeparator.setName("statusPanelSeparator"); // NOI18N
 
        statusMessageLabel.setName("statusMessageLabel"); // NOI18N
 
        statusAnimationLabel.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        statusAnimationLabel.setName("statusAnimationLabel"); // NOI18N
 
        progressBar.setName("progressBar"); // NOI18N
 
        javax.swing.GroupLayout statusPanelLayout = new javax.swing.GroupLayout(statusPanel);
        statusPanel.setLayout(statusPanelLayout);
        statusPanelLayout.setHorizontalGroup(
            statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(statusPanelSeparator, javax.swing.GroupLayout.DEFAULT_SIZE, 419, Short.MAX_VALUE)
            .addGroup(statusPanelLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(statusMessageLabel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 249, Short.MAX_VALUE)
                .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(statusAnimationLabel)
                .addContainerGap())
        );
        statusPanelLayout.setVerticalGroup(
            statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(statusPanelLayout.createSequentialGroup()
                .addComponent(statusPanelSeparator, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(statusPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(statusMessageLabel)
                    .addComponent(statusAnimationLabel)
                    .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(3, 3, 3))
        );
 
        setComponent(mainPanel);
        setMenuBar(menuBar);
        setStatusBar(statusPanel);
    }// </editor-fold>
    
    //HandleComboBox is called by the event handle for our combo box
    //Creates a temporary combo box to help set the arrays and to set the correct interest rates into the interest text field
    private void HandleComboBox(java.awt.event.ActionEvent evt)
    {
	//creating a temporary combo box
	//the source of our event is our combo box (bx_term)
	javax.swing.JComboBox temp_cb = (javax.swing.JComboBox)evt.getSource();
 
	//Creating a temporary String to be used to assign text for our txtfld_term.
	String temp_term = (String)temp_cb.getSelectedItem();
	txtfld_termauto.setText(temp_term);
	label_yearsauto.setText(temp_term + " years");
		
	//setting the index to our interest array
	int index = 0;
	switch((int)(Integer.parseInt(temp_term)))
	{
		case 7 :
        		index = 0;
                	break;
		case 15 :
			index = 1;
			break;
		case 30 :
			index = 2;
			break;
	}
	//using the index for our interest array
	txtfld_interestauto.setText(interest[index]+"");
	label_interestauto.setText("Interest Rate: " + interest[index] * 100 +"%");
    }
 
    // Variables declaration - do not modify
    private javax.swing.JLabel Principal;
    private javax.swing.JLabel Principal1;
    private javax.swing.JComboBox bx_term;
    private javax.swing.JLabel label_interest;
    private javax.swing.JLabel label_interestauto;
    private javax.swing.JLabel label_yearsauto;
    private javax.swing.JPanel mainPanel;
    private javax.swing.JMenuBar menuBar;
    private javax.swing.JProgressBar progressBar;
    private javax.swing.JLabel statusAnimationLabel;
    private javax.swing.JLabel statusMessageLabel;
    private javax.swing.JPanel statusPanel;
    private javax.swing.JLabel term;
    private javax.swing.JTextField txtfld_interest;
    private javax.swing.JTextField txtfld_principal;
    private javax.swing.JTextField txtfld_principal1;
    private javax.swing.JTextField txtfld_term;
    private javax.swing.JLabel txtfld_term1;
    // End of variables declaration
    //arrays
    private String[] terms    = { "7", "15", "30" };
    private double[] interest = { 0.0535, 0.055, 0.0575 };
    
    //used for the auto calculations
    private javax.swing.JTextField txtfld_principalauto;
    private javax.swing.JTextField txtfld_termauto;
    private javax.swing.JTextField txtfld_interestauto;
    
    private final Timer messageTimer;
    private final Timer busyIconTimer;
    private final Icon idleIcon;
    private final Icon[] busyIcons = new Icon[15];
    private int busyIconIndex = 0;
 
    private JDialog aboutBox;
}

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Avatar of CEHJ
CEHJ
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>>I recieve an error a bunch of errors in the netbeans IDE.

Please post them here
Avatar of krishna kishore mellacheruvu venkata
krishna kishore mellacheruvu venkata
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Did u kept appframework-1.0.3.jar and swingx-0.9.1.jar in classpath?

if so then post the errors you are getting.
Avatar of neonate928
neonate928

ASKER

These are the exception errors I recieve in the back ground in the Netbeans IDE:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at calculator.CalculatorView.HandleComboBox(CalculatorView.java:297)
        at calculator.CalculatorView.access$800(CalculatorView.java:22)
        at calculator.CalculatorView$4.actionPerformed(CalculatorView.java:221)
        at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1242)
        at javax.swing.JComboBox.setSelectedItem(JComboBox.java:569)
        at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:605)
        at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:814)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)
        at java.awt.Component.processMouseEvent(Component.java:6041)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:480)
        at java.awt.Component.processEvent(Component.java:5806)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4413)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4243)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Avatar of CEHJ
CEHJ
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Make sure that the selecteditem is not null and that the components have been initialized in HandleComboBox
ASKER CERTIFIED SOLUTION
Avatar of CEHJ
CEHJ
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Avatar of neonate928
neonate928

ASKER

Thank you!!!