So I have a JPanel with a CardLayout. this CardLayout, as expected, manages the switching of panels in the frame. The switching is done by two buttons: "Back" and "Next".
I want to know if there is a way to close the whole application (i.e. call System.exit(0)
) when it is on the last card and "Next" is pressed again.
I have looked for a solution everywhere, but I can't find anything.
The problem is: I don't know how to check which is the last one.
Here is the listener excerpt of my code:
public void actionPerformed(ActionEvent arg0) {
CardLayout l = (CardLayout) holder.getLayout();
if(arg0.getSource() == opt[1]){ //opt[1] is the "Next" button
//Insert if statement here to check if
//the CardLayout is on the last card
{
System.exit(0);
} else {
l.next(holder); //holder is the JPanel with the CardLayout
}
}
}
What about dispose()
which is inherited from Window
? Make sure you set:
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JFrame frame = ...
// ...
frame.setVisible(false); // hide the GUI
frame.dispose(); // destroy and release the GUI resources
For example:
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class CardLayoutGUI
{
private JFrame frame;
private JButton btnBack;
private JButton btnNext;
private CardLayout cLayout;
private JPanel panUp;
private JPanel panDown;
private static final String[] cards =
{"card1", "card2", "card3", "card4", "card5"};
private int currentCard = 0;
public void init()
{
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
((JPanel)frame.getContentPane()).setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
btnBack = new JButton("Back");
btnNext = new JButton("Next");
btnBack.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
btnNext.setText("Next");
currentCard--;
cLayout.show(panUp, cards[currentCard]);
if(currentCard == 0) btnBack.setVisible(false);
}
});
btnNext.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
btnBack.setVisible(true);
currentCard++;
if(currentCard == cards.length - 1) // last card
{
btnNext.setText("Exit");
cLayout.show(panUp, cards[currentCard]);
}
else if(currentCard >= cards.length)
{
frame.setVisible(false);
frame.dispose();
}
else
{
cLayout.show(panUp, cards[currentCard]);
}
}
});
cLayout = new CardLayout();
panUp = new JPanel(cLayout);
panDown = new JPanel();
frame.add(panUp, BorderLayout.CENTER);
frame.add(panDown, BorderLayout.SOUTH);
panDown.add(btnBack);
panDown.add(btnNext);
for(int i = 0; i < cards.length; i++) createPanels(panUp, cards[i]);
frame.pack();
frame.setLocationRelativeTo(null);
btnBack.setVisible(false);
}
public void showGUI()
{
frame.setVisible(true);
}
private void createPanels(JPanel container, String label)
{
JPanel pan = new JPanel();
pan.add(new JLabel(label));
container.add(pan, label);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
CardLayoutGUI clg = new CardLayoutGUI();
clg.init();
clg.showGUI();
}
});
}
}