Hi, Ive cut and pastethis and tried to make a calculator display. What have I done wrong?
<CODE>
// GUI to display the
cards, will have 7 panels and two
cards in each panel.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class cardGUI implements ItemListener {
JPanel cards; //a panel that uses CardLayout
final static
String ENGLISHPANEL = "JPanel with English";
final static String SLOVAKPANEL = "JPanel with Slovak";
// set up the cards in a content pane
public void addComponentToPane(Container pane) {
//Put the JComboBox in a JPanel to get a nicer look.
JPanel comboBoxPane = new JPanel(); //use FlowLayout
String comboBoxItems[] = { ENGLISHPANEL, SLOVAKPANEL };
JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
//Create the "cards".
JPanel card1 = new JPanel();
card1.add(new JButton("Try"));
card1.add(new JButton("Next"));
card1.add(new JTextField("TextField", 20));
JPanel card2 = new JPanel();
card2.add(new JLabel("English Word"));
//Create the panel that contains the "cards".
cards = new JPanel(new CardLayout());
cards.add(card1, ENGLISHPANEL);
cards.add(card2, SLOVAKPANEL );
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);
}
/// when only above code present thiswont complile because an interface is expected, why?
public void itemStateChanged(ItemEvent evt) {
CardLayout cl = (CardLayout)(cards.getLayout());
cl.show(cards, (String)evt.getItem());
}
/// when only above code present thiswont complile because an interface is
// expected, why? No brackets
/**
* Create the GUI and show it. For
thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowcardGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("Card GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
cardGUI demo = new cardGUI();
demo.addComponentToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowcardGUI();
}
});
}
}
</CODE>