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java swing Jframe not showing up correctly

Everything looks ok to me but for some reason, nothing is showing up properly, maybe I missed something but I'm not sure why it's not working, can someone help me out?
** task **
Improve your program by adding two
combo boxes in the frame. Through the combo boxes, the user should be able to
select their preferred fonts and font sizes. The displayed text will then be updated
accordingly (see the figure below).
Here is what its suppose to look like
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JTextField;
import java.awt.*;
import java.awt.event.*;
public class ComboGUI extends JFrame implements ActionListener {
public JButton update;
public JTextField textField;
public JLabel textLabel;
public JComboBox<String> fontBox;
public JComboBox sizeBox;
public String font;
public String size;
public ComboGUI()
{
components();
panels();
actionListener();
}
public void components()
{
this.update = new JButton("update");
this.textField=new JTextField(20);
this.textField.setText("hello");
this.textLabel= new JLabel("GUI");
this.font="Arial";
this.size="20";
this.textLabel.setFont(new Font(this.font, Font.PLAIN, Integer.parseInt(this.size)));
this.fontBox=new JComboBox();
this.fontBox.addItem("Times New Roman");
this.fontBox.addItem("Calibri");
this.sizeBox= new JComboBox();
this.sizeBox.addItem("20");
this.sizeBox.addItem("30");
this.sizeBox.addItem("40");
this.setSize(400, 400);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
}
public void panels(){
JPanel northPanel =new JPanel();
JLabel fontLabel =new JLabel("Font: ");
JLabel sizeLabel =new JLabel("size: ");
northPanel.add(fontLabel);
//center
BGPanel centerPanel =new BGPanel();
centerPanel.add(this.textLabel);
this.add(centerPanel,BorderLayout.CENTER);
//south
BGPanel southPanel =new BGPanel();
southPanel.add(this.textLabel);
this.add(southPanel,BorderLayout.CENTER);
}
public void actionListener(){
this.update.addActionListener(this);
this.fontBox.addActionListener(this);
this.sizeBox.addActionListener(this);
}
#Override
public void actionPerformed(ActionEvent e){
if(e.getSource()==this.update){
this.textLabel.setText(this.textField.getText());
}
if(e.getSource()==this.fontBox || e.getSource()==this.sizeBox){
this.font=this.fontBox.getSelectedItem().toString();
this.size=this.sizeBox.getSelectedItem().toString();
this.textLabel.setFont(new Font(this.font,Font.PLAIN,Integer.parseInt(this.size)));
}
this.repaint();
}
public static void main(String[] args) {
ComboGUI comb =new ComboGUI();
combo.setVisible(true);
}
}
this is what im getting instead

It looks like you are missing this.setVisible(true); at the end of your constructor.
Your code should look like this:
public ComboGUI()
{
components();
panels();
actionListener();
this.setVisible(true);
}

incase anyone is trying to do something similar, this is the complete solution
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
public class ComboGUI extends JFrame implements ActionListener{
public void updateLabelText(){
size = fSize.getItemAt(fSize.getSelectedIndex());
font = fStyles.getItemAt(fStyles.getSelectedIndex());
updateLabel.setFont(new Font(font,Font.PLAIN,size));
}
public static BGPanel centrePanel;
public JComboBox<String> fStyles;
public JComboBox<Integer> fSize;
public JButton updateButton;
public JLabel updateLabel;
public JLabel fontLabel;
public JLabel sizeLabel;
public JTextField textField;
public JPanel BottomPanel;
public JPanel topPanel;
private String font;
private int size;
public ComboGUI() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(400,400);
this.setLocation(0, 0);
//Top
topPanel = new JPanel();
fontLabel = new JLabel("Font:");
sizeLabel = new JLabel("Font Size:");
fStyles = new JComboBox<String>();
fStyles.addItem("Arial");
fStyles.addItem("TimesRoman");
fStyles.addItem("Serif");
fStyles.addItem("Monospaced");
fStyles.addActionListener(this);
fSize = new JComboBox<Integer>();
fSize.addItem(10);
fSize.addItem(20);
fSize.addItem(30);
fSize.addItem(40);
fSize.addActionListener(this);
topPanel.add(fontLabel);
topPanel.add(fStyles);
topPanel.add(sizeLabel);
topPanel.add(fSize);
//CentrePanel setup
centrePanel = new BGPanel();
updateLabel = new JLabel("I love PDC :)");
centrePanel.add(updateLabel);
//Bottom
BottomPanel = new JPanel();
updateButton = new JButton("Update");
textField = new JTextField(20);
textField.setText("I love PDC :)");
updateButton.addActionListener(this);
BottomPanel.add(textField);
BottomPanel.add(updateButton);
this.add(centrePanel,BorderLayout.CENTER);
this.add(BottomPanel,BorderLayout.SOUTH);
this.add(topPanel,BorderLayout.NORTH);
updateLabelText();
}
public static void main(String[] args) {
ComboGUI combo = new ComboGUI();
combo.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == updateButton){
updateLabel.setText(textField.getText().trim());
}
if(e.getSource() == fStyles){
updateLabelText();
}
if (e.getSource() == fSize){
updateLabelText();
}
}
}

How to make my button do something in a BoxLayout?

I made a BoxLayout GUI and i'm wondering how i'd use an actionlistener to make the button close the window. If I try to put in RegisterNew.setVisible(false); in an actionlistener, it gives me an error
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RegisterNew extends JFrame
{
public RegisterNew(int axis){
// creates the JFrame
super("BoxLayout Demo");
Container con = getContentPane();
con.setLayout(new BoxLayout(con, axis));
con.add(new JLabel("Enter your desired username"));
con.add(new JTextField());
con.add(new JLabel("Enter your password"));
con.add(new JTextField());
con.add(new JButton("Create Account"));
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String args[])
{
RegisterNew newDemo = new RegisterNew(BoxLayout.Y_AXIS);
}
}
I'm also trying to link this to ANOTHER GUI so that when you press a button, this one appears, but it gives me the same error as if i put
RegisterNew.setVisible(true); into the action listener

If that's a subordinate dialog window, then use a JDialog, not a JFrame.
If your ActionListener is an inner class then use RegisterNew.this.close();
Else you can get the window ancestor for the JButton using SwingUtilities.getWindowAncestor(button) and call close() or better dispose() on the Window returned.
Note that BoxLayout and layout managers in general have nothing to do with your current problem.
e.g.,
Test class that shows the new register dialog and that extracts information from it.
import java.awt.BorderLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class TestRegistration extends JPanel {
private JTextArea textArea = new JTextArea(30, 60);
public TestRegistration() {
JPanel bottomPanel = new JPanel();
bottomPanel.add(new JButton(new ShowRegisterNewAction()));
textArea.setFocusable(false);
textArea.setEditable(false);
setLayout(new BorderLayout());
add(new JScrollPane(textArea,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
add(bottomPanel, BorderLayout.PAGE_END);
}
private class ShowRegisterNewAction extends AbstractAction {
private RegisterNew registerNew = null;
public ShowRegisterNewAction() {
super("Show Register New Dialog");
putValue(MNEMONIC_KEY, KeyEvent.VK_S);
}
#Override
public void actionPerformed(ActionEvent e) {
if (registerNew == null) {
JButton btn = (JButton) e.getSource();
Window window = SwingUtilities.getWindowAncestor(btn);
registerNew = new RegisterNew(window, BoxLayout.PAGE_AXIS);
}
registerNew.setVisible(true);
String userName = registerNew.getUserName();
String password = new String(registerNew.getPassword());
textArea.append("User Name: " + userName + "\n");
textArea.append("Password: " + password + "\n");
textArea.append("\n");
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("TestRegistration");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new TestRegistration());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
New Register class that holds the dialog and has code for displaying it and for extracting information from it. Uses BoxLayout.
import java.awt.Container;
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class RegisterNew {
private JDialog dialog = null;
private JTextField nameField = new JTextField(10);
private JPasswordField passField = new JPasswordField(10);
public RegisterNew(Window window, int axis) {
dialog = new JDialog(window, "Register New", ModalityType.APPLICATION_MODAL);
Container con = dialog.getContentPane();
con.setLayout(new BoxLayout(con, axis));
con.add(new JLabel("Enter your desired username"));
con.add(nameField);
con.add(new JLabel("Enter your password"));
con.add(passField);
con.add(new JButton(new AcceptAction()));
dialog.pack();
dialog.setLocationRelativeTo(window);
}
public char[] getPassword() {
return passField.getPassword();
}
public String getUserName() {
return nameField.getText();
}
public void setVisible(boolean b) {
dialog.setVisible(b);
}
private class AcceptAction extends AbstractAction {
public AcceptAction() {
super("Accept");
putValue(MNEMONIC_KEY, KeyEvent.VK_A);
}
#Override
public void actionPerformed(ActionEvent e) {
dialog.dispose();
}
}
}

JButton are on JPanel on which it isn't should be [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 years ago.
Improve this question
Hi this is my concrete problem. I was tried to add one button to one panel with for loop.
This is for loop for creating JButtons.
nizButtona=new JButton[22];
for(int i=0;i<nizButtona.length;i++){
nizButtona[i] = new JButton();
if(i==0){
nizButtona[i].setText("Započni kviz"); //Start quiz
nizButtona[i].addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
cl.next(nizPanela[1]);
}
});
}else if(i==1){
nizButtona[i].setText("Izlaz"); //Quit
nizButtona[i].addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
System.exit(0);
}
});
}else if(i<12){
nizButtona[i].setText("Sledeće pitanje"); //Next question, on next panel
nizButtona[i].addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
cl.next(nizPanela[1]);
}
});
}
This is new loop for adding buttons on panels. Here nizButtona[i-1] is i-1 because first button for next question have for 1 argument than JPanel where it's need to be add, and you GridBagLayout for all components so i will put all on the same location for each panel. Without it the problem is the same.
for(int i=3;i<=11;i++){
nizPanela[i].add(nizButtona[i-1]);
}
Here is how i was create array for JPanels.
nizPanela = new JPanel[13];
for (int i=0;i<nizPanela.length;i++ ){
nizPanela[i] = new JPanel();
if(i<=1){
okvir.getContentPane().add(nizPanela[i]);//Does i real need this getContentPane?
}else{
nizPanela[i].setLayout(new GridBagLayout());
nizPanela[1].add(nizPanela[i], String.valueOf(i));
}
}
cl=new CardLayout();
nizPanela[1].setLayout(cl);
cl.show(nizPanela[1],"2");
This is how program look photo Button Sledeće pitanje visible on this panel but it don't should be. It's only visible if i move mouse pointer through place of this button.

Instead of setLayout(null), learn to use layouts to your advantage. The example below uses a series of nested layouts to add a one grid inside another.
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
/**
* #see https://stackoverflow.com/a/36243395/230513
*/
public class Test {
private static final int ROW = 2;
private static final int COL = 5;
private void display() {
JFrame f = new JFrame("Test");
f.setLayout(new GridLayout(0, 1));
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel top = new JPanel(new GridBagLayout());
top.setBackground(Color.darkGray);
JLabel label = new JLabel("Post no bills.");
label.setForeground(Color.yellow);
top.add(label);
f.add(top);
f.add(createGridPanel());
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private JPanel createGridPanel() {
JPanel p = new JPanel(new GridLayout(ROW, COL, 5, 5));
p.setBorder(BorderFactory.createLineBorder(Color.yellow,5));
p.setBackground(Color.yellow);
for (int r = 0; r < ROW; r++) {
for (int c = 0; c < COL; c++) {
p.add(createSubPanel());
}
}
return p;
}
private JPanel createSubPanel() {
JPanel p = new JPanel(new GridLayout(0, 1));
JPanel top = new JPanel();
top.add(new JButton("One"));
top.add(new JButton("Two"));
JPanel bot = new JPanel();
bot.add(new JRadioButton("A"));
bot.add(new JRadioButton("B"));
bot.add(new JRadioButton("C"));
bot.add(new JRadioButton("D"));
p.add(top);
p.add(bot);
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Test()::display);
}
}
Addendum: "I want … two JButtons for next and back."
To permit navigation by button from one panel to another, use CardLayout, shown here and revised below.
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
/**
* #see https://stackoverflow.com/a/36243395/230513
*/
public class CardPanel extends JPanel {
private static final JPanel cards = new JPanel(new CardLayout());
private final String name;
public CardPanel(String name) {
super(new GridLayout(0, 1));
this.name = name;
JPanel top = new JPanel(new GridBagLayout());
top.setBackground(Color.darkGray);
JLabel label = new JLabel(name);
label.setForeground(Color.yellow);
top.add(label);
JPanel bot = new JPanel();
bot.setBorder(BorderFactory.createLineBorder(Color.yellow, 5));
bot.add(new JRadioButton("A"));
bot.add(new JRadioButton("B"));
bot.add(new JRadioButton("C"));
bot.add(new JRadioButton("D"));
this.add(top);
this.add(bot);
}
#Override
public String toString() {
return name;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
create();
}
});
}
private static void create() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for (int i = 1; i < 9; i++) {
CardPanel p = new CardPanel("Panel " + String.valueOf(i));
cards.add(p, p.toString());
}
JPanel control = new JPanel();
control.add(new JButton(new AbstractAction("\u22b2Prev") {
#Override
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout) cards.getLayout();
cl.previous(cards);
}
}));
control.add(new JButton(new AbstractAction("Next\u22b3") {
#Override
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout) cards.getLayout();
cl.next(cards);
}
}));
f.add(cards, BorderLayout.CENTER);
f.add(control, BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}

Reinitialise a jframe

I've a main frame on which there is a side panel with some buttons, and central panel used to display the tables and data generated from buttons on the side panel and its sub-panels
On the start my central panel is blank and I want it to always return to its initial state( blank ) after each click on a button before generating any data
I've use some sort of observer pattern (I'm not so experienced) but my problem is that the central panel must display data after clicks on some buttons that are on panels that also need a click on the side panel before to be generated
I've tried to make an executable example on the following classes, my real application displays some tables on the central panel and i send the models via the update method of the observers
hope its clear for you and I hope if you can really help me
1 - the main frame:
package tests;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class MainFrame extends JFrame implements MyObserver{
private SidePanel sidePanel;
private JPanel centralPanel;
private JFrame frame;
private JLabel title;
public MainFrame(){
frame = new JFrame("TEST");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLayout(new BorderLayout());
sidePanel = new SidePanel();
sidePanel.addObserver(this);
centralPanel = new JPanel();
title = new JLabel();
initialise(0);
frame.pack();
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
private void initialise(int i) {
if( i == 0){
centralPanel.setPreferredSize(new Dimension(400,300));
centralPanel.setBackground(Color.green);
title.setText("GREEN");
centralPanel.add(title, BorderLayout.CENTER);
frame.add(sidePanel, BorderLayout.WEST);
frame.add(centralPanel, BorderLayout.CENTER);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new MainFrame();
}
});
}
#Override
public void update(int color) {
if(color == 0){
centralPanel.setBackground(Color.yellow);
title.setText("YELLOW");
}else{
centralPanel.setBackground(Color.pink);
title.setText("PINK");
}
}
}
2 - The side Panel
package tests;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
public class SidePanel extends JPanel implements MyObserver,MyObservable{
private JPanel panel;
private JButton test;
private MyObserver observer;
private ButtonPanel buttonPanel;
public SidePanel(){
panel = new JPanel();
panel.setPreferredSize(new Dimension(140, 300));
panel.setBackground(Color.blue);
panel.setLayout(new BoxLayout(panel, 0));
test = new JButton("Lunch buttons");
test.setPreferredSize(new Dimension(80,30));
buttonPanel = new ButtonPanel();
buttonPanel.addObserver(this);
test.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
buttonPanel.setVisible(true);
}
});
panel.add(Box.createVerticalGlue());
panel.add(test);
panel.add(Box.createVerticalGlue());
panel.setVisible(true);
this.add(panel, BorderLayout.CENTER);
}
#Override
public void addObserver(MyObserver obs) {
this.observer = obs;
}
#Override
public void updateObserver(MyObserver obs, int color) {
obs.update(color);
}
#Override
public void update(int color) {
updateObserver(observer, color);
}
}
3 - the buttons panel, generally the source of any data to be displayed on the central panel
package tests;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
public class ButtonPanel extends JDialog implements MyObservable{
private JButton yellow;
private JButton orange;
private JPanel panel;
private MyObserver observer;
public ButtonPanel(){
panel = new JPanel();
panel.setPreferredSize(new Dimension(300, 40));
panel.setLayout(new FlowLayout());
this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
this.setContentPane(panel);
yellow = new JButton("YELLOW");
yellow.setPreferredSize(new Dimension(100,30));
yellow.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
updateObserver(observer, 0);
}
});
orange = new JButton("ORANGE");
orange.setPreferredSize(new Dimension(100,30));
orange.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
updateObserver(observer, 1);
}
});
panel.add(yellow);
panel.add(orange);
pack();
setLocationRelativeTo(null);
}
#Override
public void addObserver(MyObserver obs) {
this.observer = obs;
}
#Override
public void updateObserver(MyObserver obs, int color) {
obs.update(color);
}
}
Finally, the customized observer and observable interfaces, note in the real app i use a table model not just an int - I'm not sure it's a good way -
package tests;
public interface MyObservable {
public void addObserver(MyObserver obs);
public void updateObserver(MyObserver obs, int color);
}
package tests;
public interface MyObserver {
public void update(int color);
}

CHANGED ANSWER:
In SidePanel.java add:
private MainFrame frame;
Then make your constructor take a MyFrame object as parameter. Do this:
public SidePanel(MainFrame frame){
this.frame = frame;
//rest not changed
//
}
Change the actionPerformed() of test button to:
test.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
buttonPanel.setVisible(true);
frame.initialise(0); // this line is added
}
});
In MainFrame.java:
Change sidePanel = new SidePanel(); to sidePanel = new SidePanel(this);
AND
Change private void initialise(int i) to public void initialise(int i)
This does what you are trying to achieve.

Java Swings Select Tab

I have 4 JPanels. In one of the panel I have a combo Box.Upon selecting "Value A" in combo box Panel2 should be displayed.Similarly if I select "Value B" Panel3 should be selected....
Though action Listener should be used in this context.How to make a call to another tab with in that action listener.
public class SearchComponent
{
....
.
public SearchAddComponent(....)
{
panel = addDropDown(panelList(), "panel", gridbag, h6Box);
panel.addComponentListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ItemSelectable is = (ItemSelectable)actionEvent.getSource();
Object name=selectedString(is);
}
});
}
public static final Vector<String> panelList(){
List<String> panelList = new ArrayList<String>();
panelList.add("A");
panelList.add("B");
panelList.add("C");
panelList.add("D");
panelList.add("E");
panelList.add("F);
Vector<String> panelVector = null;
Collections.copy(panelVector, panelList);
return panelVector;
}
public Object selectedString(ItemSelectable is) {
Object selected[] = is.getSelectedObjects();
return ((selected.length == 0) ? "null" : (ComboItem)selected[0]);
}
}

Use a Card Layout. See the Swing tutorial on How to Use a Card Layout for a working example.

Try This code:
import java.awt.EventQueue;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Container;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class CardLayoutExample {
JFrame guiFrame;
CardLayout cards;
JPanel cardPanel;
public static void main(String[] args) {
//Use the event dispatch thread for Swing components
EventQueue.invokeLater(new Runnable()
{
#Override
public void run()
{
new CardLayoutExample();
}
});
}
public CardLayoutExample()
{
guiFrame = new JFrame();
//make sure the program exits when the frame closes
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setTitle("CardLayout Example");
guiFrame.setSize(400,300);
//This will center the JFrame in the middle of the screen
guiFrame.setLocationRelativeTo(null);
guiFrame.setLayout(new BorderLayout());
//creating a border to highlight the JPanel areas
Border outline = BorderFactory.createLineBorder(Color.black);
JPanel tabsPanel = new JPanel();
tabsPanel.setBorder(outline);
JButton switchCards = new JButton("Switch Card");
switchCards.setActionCommand("Switch Card");
switchCards.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent event)
{
cards.next(cardPanel);
}
});
tabsPanel.add(switchCards);
guiFrame.add(tabsPanel,BorderLayout.NORTH);
cards = new CardLayout();
cardPanel = new JPanel();
cardPanel.setLayout(cards);
cards.show(cardPanel, "Fruits");
JPanel firstCard = new JPanel();
firstCard.setBackground(Color.GREEN);
addButton(firstCard, "APPLES");
addButton(firstCard, "ORANGES");
addButton(firstCard, "BANANAS");
JPanel secondCard = new JPanel();
secondCard.setBackground(Color.BLUE);
addButton(secondCard, "LEEKS");
addButton(secondCard, "TOMATOES");
addButton(secondCard, "PEAS");
cardPanel.add(firstCard, "Fruits");
cardPanel.add(secondCard, "Veggies");
guiFrame.add(tabsPanel,BorderLayout.NORTH);
guiFrame.add(cardPanel,BorderLayout.CENTER);
guiFrame.setVisible(true);
}
//All the buttons are following the same pattern
//so create them all in one place.
private void addButton(Container parent, String name)
{
JButton but = new JButton(name);
but.setActionCommand(name);
parent.add(but);
}
}