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PO(Java) Why is this tabbed pane not working correctly?
 

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  1. PO(Java) Why is this tabbed pane not working correctly?
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    <p>Note: I've searched all over the web (this site and others) and cannot answer this myself.</p> <p>Ok guys. I am a new Java programmer, and we just got done covering tabbed panes. This is the state in which I turned in my assignment: it doesn't work, and I can't figure out why. I've changed so much crap around, I can't keep it straight in my head anymore, but I know it's probably something incredibly simple.</p> <p>I apologize for the length of the code, but I'm trying to give you the entirety of my code so you can tell me where I jacked it up.</p> <p>Thanks in advance. -- Also, I'm aware there are other Warnings (i.e. unused imports), but I'm not worried about those. And, this will not affect my grade (as I said, already submitted), but I want to know wtf I did wrong!</p> <pre><code>import java.awt.BorderLayout; import java.awt.Container; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.text.DecimalFormat; import java.awt.Color; import javax.swing.JOptionPane; import javax.swing.JTabbedPane; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.JPanel; import javax.swing.JComponent; public class TabbedPane1 extends JPanel { public TabbedPane1() { JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.addTab("DayGui", new DayGui()); tabbedPane.addTab("OfficeCalc", new OfficeAreaCalculator()); add(tabbedPane); } public static void main(String[] args) { JFrame myFrame = new JFrame("Tabbed Programs"); myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); myFrame.add(new TabbedPane1(), BorderLayout.CENTER); myFrame.pack(); myFrame.setVisible(true); } class DayGui extends JPanel { private JPanel mainFrame; private JButton cmdGood; private JButton cmdBad; public DayGui() { mainFrame = new JPanel(); cmdGood = new JButton("Good"); cmdBad = new JButton("Bad"); Container myContainer = mainFrame; myContainer.setLayout(new FlowLayout()); myContainer.add(cmdGood); myContainer.add(cmdBad); cmdGood.setMnemonic('G'); cmdBad.setMnemonic('B'); mainFrame.setSize(300, 100); myContainer.setBackground(Color.blue); cmdGood.setBackground(Color.cyan); cmdBad.setBackground(Color.cyan); /*mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } });*/ ButtonsHandler bhandler = new ButtonsHandler(); cmdGood.addActionListener(bhandler); cmdBad.addActionListener(bhandler); //mainFrame.setVisible(true); } class ButtonsHandler implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getSource() == cmdGood) JOptionPane.showMessageDialog(null, "Today is a good day!", "Event Handler Message", JOptionPane.INFORMATION_MESSAGE); if(e.getSource() == cmdBad) JOptionPane.showMessageDialog(null, "Today is a bad day!", "Event Handler Message", JOptionPane.INFORMATION_MESSAGE); } } } class OfficeAreaCalculator extends JPanel { private JPanel mainFrame; private JButton calculateButton; private JButton exitButton; private JTextField lengthField; private JTextField widthField; private JTextField areaField; private JLabel lengthLabel; private JLabel widthLabel; private JLabel areaLabel; public OfficeAreaCalculator() { mainFrame = new JPanel(); exitButton = new JButton("Exit"); calculateButton = new JButton("Calculate"); lengthField = new JTextField(5); widthField = new JTextField(5); lengthLabel = new JLabel("Enter the length of the office:"); widthLabel = new JLabel("Enter the width of the office:"); areaLabel = new JLabel("Office area:"); areaField = new JTextField(5); areaField.setEditable(false); Container c = mainFrame; c.setLayout(new FlowLayout()); c.setBackground(Color.green); c.add(lengthLabel); c.add(lengthField); c.add(widthLabel); c.add(widthField); c.add(areaLabel); c.add(areaField); c.add(calculateButton); c.add(exitButton); calculateButton.setMnemonic('C'); exitButton.setMnemonic('x'); mainFrame.setSize(260, 150); /*mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } });*/ CalculateButtonHandler chandler = new CalculateButtonHandler(); calculateButton.addActionListener(chandler); ExitButtonHandler ehandler = new ExitButtonHandler(); exitButton.addActionListener(ehandler); FocusHandler fhandler = new FocusHandler(); lengthField.addFocusListener(fhandler); widthField.addFocusListener(fhandler); areaField.addFocusListener(fhandler); //mainFrame.setVisible(true); } class CalculateButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { DecimalFormat num = new DecimalFormat(",###.##"); double width, length, area; String instring; instring = lengthField.getText(); if(instring.equals("")) { instring = ("0"); lengthField.setText("0"); } length = Double.parseDouble(instring); instring = widthField.getText(); if(instring.equals("")) { instring = ("0"); widthField.setText("0"); } width = Double.parseDouble(instring); area = length * width; areaField.setText(num.format(area)); } } class ExitButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { System.exit(0); } } class FocusHandler implements FocusListener { public void focusGained(FocusEvent e) { if(e.getSource() == lengthField || e.getSource() == widthField) { areaField.setText(""); } else if(e.getSource() == areaField) { calculateButton.requestFocus(); } } public void focusLost(FocusEvent e) { if(e.getSource() == widthField) { calculateButton.requestFocus(); } } } } } </code></pre>
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      1. PO(Java) Why is this tabbed pane not working correctly?
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