So as of now when I run the program two different panels open up. One is a JPanel and one is a JFrame. I was wondering how to either combine the two or just take the JLabel on the JPanel and put it on the JFrame I already have?
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
public class MainQuestions {
public static void main (String args[]){
JFrame frame=new JFrame();
setLayout(new BorderLayout());
JPanel labelPanel = new JPanel();
labelPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
JLabel bottomRtLabel = new JLabel("BOTTOM RIGHT LABEL");
labelPanel.add(bottomRtLabel);
frame.add(labelPanel,BorderLayout.SOUTH);
frame.setVisible(true);
Object ARRAY[]={"French","English","Portugese","Spanish"};
String answer=(String)JOptionPane.showInputDialog(frame, "What language predominately spoken in Latin American countries?","World Geography Review", JOptionPane.PLAIN_MESSAGE, null, ARRAY, null);
if (answer==null)
{
//System.exit(0);
}
else if (answer.equals("Spanish"))
{
JOptionPane.showMessageDialog(null, "Correct!", "World Geography Review", JOptionPane.PLAIN_MESSAGE,null);
//System.exit(0);
}
else
{
JOptionPane.showMessageDialog(null, "Sorry, wrong answer.", "World Geography Review", JOptionPane.PLAIN_MESSAGE,null);
//System.exit(0);
}
}
private static void setLayout(BorderLayout borderLayout) {
// TODO Auto-generated method stub
}
}
I find many errors in your code. For starts:
JFrame frame=new JFrame();
setLayout(new BorderLayout());
Should be:
JFrame frame=new JFrame();
frame.setLayout(new BorderLayout());
Also, you might want to move all your code to a Constructor. So your main may look like this:
public static void main (String args[]){
new MainQuestions();
}
Then inside the constructor, move all your code:
public MainQuestions(){
JFrame frame=new JFrame();
frame.setLayout(new BorderLayout());
JPanel labelPanel = new JPanel();
labelPanel.setLayout(new FlowLayout(FlowLayout.RIGHT)); // Read up on GridBagLayout
JLabel bottomRtLabel = new JLabel("BOTTOM RIGHT LABEL");
labelPanel.add(bottomRtLabel);
frame.add(labelPanel,BorderLayout.SOUTH);
frame.setVisible(true);
String ARRAY[]={"French","English","Portugese","Spanish"}; // Notice how I changed the type to String
String answer=(String)JOptionPane.showInputDialog(frame, "What language predominately spoken in Latin American countries?","World Geography Review", JOptionPane.PLAIN_MESSAGE, null, ARRAY, null);
if (answer==null)
{
//code
}
else if (answer.equals("Spanish"))
{
JOptionPane.showMessageDialog(null, "Correct!", "World Geography Review", JOptionPane.PLAIN_MESSAGE,null);
}
else
{
JOptionPane.showMessageDialog(null, "Sorry, wrong answer.", "World Geography Review", JOptionPane.PLAIN_MESSAGE,null);
}
System.exit(0);
}
}
I haven't run this edited code yet. Try it out by typing it yourself and debugging.
You may extend JPanel. Something like this:
public class MainQuestions {
public static void main (String args[]){
JFrame frame=new JFrame();
YourClass labelPanel = new YourClass();
frame.setLayout(new BorderLayout());
frame.add(labelPanel,BorderLayout.SOUTH);
setVisible(true);
}
class YourClass extends JPanel {
YourClass(){
//add label there
}
}
Related
I had a CardLayout example working correctly with a button, then tried to convert it to work with keypress. I think the problem is that I don't have focus, but I can't set the focus to frame or panel successfully. Thanks!
I tried requestFocusInWindow from the frame and from the first panel shown, and that didn't help. I asked frame.getFocusOwner() and it returned null.
I thought that CardLayout would give the focus to the top element automatically, but while that worked when I had a button, it is not working now.
public class MyCardLayoutExample3 {
public static void main(String[] args){
MyCardLayoutExample3 game = new MyCardLayoutExample3();
game.display();
}
void display() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(300, 200);
CardLayout cardLayout = new CardLayout();
frame.getContentPane().setLayout(cardLayout);
MyGamePanel3 mgp3 = new MyGamePanel3("minigame A", Color.red);
frame.getContentPane().add(mgp3);
frame.getContentPane().add(new MyGamePanel3("minigame B", Color.green));
frame.getContentPane().add(new MyGamePanel3("minigame C", Color.blue));
frame.setVisible(true);
System.out.println("owner: " + frame.getFocusOwner()); //this prints null
}
}
class MyGamePanel3 extends JPanel implements KeyListener{
MyGamePanel3(String text, Color bg){
JLabel textLabel = new JLabel(text);
this.setBackground(bg);
this.add(textLabel);
}
#Override
public void keyTyped(KeyEvent e) {}
#Override
public void keyPressed(KeyEvent e) {
System.out.println("keyPressed worked");
}
#Override
public void keyReleased(KeyEvent e) {}
}
Changing to key bindings made the example work easily, thanks Abra. I never got the keyListener to work, despite trying the links above and many other links.
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.WindowConstants;
class MyGamePanel extends JPanel{
MyGamePanel(ActionListener alNext, String text, Color bg){
JButton buttonNext = new JButton("next");
buttonNext.addActionListener(alNext);
JLabel textLabel = new JLabel(text);
this.setBackground(bg);
this.add(textLabel);
this.add(buttonNext);
}
}
public class MyCardLayoutKeyBindingExample {
public static void main(String[] args){
MyCardLayoutKeyBindingExample game = new MyCardLayoutKeyBindingExample();
game.display();
}
void display() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(300, 200);
CardLayout cardLayout = new CardLayout();
//frame.getContentPane().setLayout(cardLayout);
JPanel mainPanel = new JPanel(cardLayout);
frame.add(mainPanel);
ActionListener al1 = e -> cardLayout.next(mainPanel);
mainPanel.add(new MyGamePanel(al1, "minigame A", Color.red));
mainPanel.add(new MyGamePanel(al1, "minigame B", Color.green));
mainPanel.add(new MyGamePanel(al1, "minigame C", Color.blue));
mainPanel.getInputMap().put(KeyStroke.getKeyStroke("SPACE"), "space");
Action kp = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
System.out.println("key pressed");
}
};
mainPanel.getActionMap().put("space", kp);
frame.setVisible(true);
}
}
I am having trouble replacing ImageIcon with a first ImageIcon whereupon a Jbutton is pressed. So far I have tried replacing the frame, .setIcon(myNewImage);, and .remove();. Not sure what to do now... (I'll need to replace and resize them.) Here is my code. (It is supposed to be like one of those Japanese dating games... please ignore that the pictures are local I have no site to host them yet.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import java.util.Scanner;
import javax.swing.ImageIcon;
import javax.swing.*;
import java.awt.*;
public class NestedPanels extends JPanel {
JPanel southBtnPanel = new JPanel(new GridLayout(3, 2, 1, 1)); //grid layout of buttons and declaration of panel SoutbtnPanel
JButton b = new JButton("Say Hello");//1
JButton c = new JButton("Say You Look Good");//1
JButton d = new JButton("Say Sorry I'm Late");//1
JButton e2 = new JButton("So where are we headed?");//2
JButton f = new JButton("Can we go to your place?");//2
JButton g = new JButton("I don't have any money for our date...");//2
public NestedPanels() { //implemeted class
//add action listener
b.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button1Clicked(e);//when button clicked, invoke method
}
});
c.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button2Clicked(e);//when button clicked, invoke method
}
});
d.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button3Clicked(e);//when button clicked, invoke method
}
});
e2.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button4Clicked(e);//when button clicked, invoke method
}
});
f.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button5Clicked(e);//when button clicked, invoke method
}
});
g.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
button6Clicked(e);//when button clicked, invoke method
}
});
southBtnPanel.add(b);
southBtnPanel.add(c);
southBtnPanel.add(d);
setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1)); //layout of buttons "Button text"
setLayout(new BorderLayout());
add(Box.createRigidArea(new Dimension(600, 600))); //space size of text box webapp over all
add(southBtnPanel, BorderLayout.SOUTH);
}
private static void createAndShowGui() {//class to show gui
NestedPanels mainPanel = new NestedPanels(); //mainPanel new class of buttons instantiation
JFrame frame = new JFrame("Date Sim 1.0");//title of webapp on top
frame.getContentPane().add(mainPanel);
ImageIcon icon = new ImageIcon("C:/Users/wchri/Pictures/10346538_10203007241845278_2763831867139494749_n.jpg");
JLabel label = new JLabel(icon);
mainPanel.add(label);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private void button1Clicked(ActionEvent e) {
southBtnPanel.removeAll();
southBtnPanel.add(e2);
southBtnPanel.add(f);
southBtnPanel.add(g);
southBtnPanel.revalidate();
southBtnPanel.repaint();
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "Hey there! Ready to get started?", "Christian feels good!", JOptionPane.PLAIN_MESSAGE); //display button Action
}
private void button2Clicked(ActionEvent e) {
southBtnPanel.removeAll();
southBtnPanel.add(e2);
southBtnPanel.add(f);
southBtnPanel.add(g);
southBtnPanel.revalidate();
southBtnPanel.repaint();
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "Ugh... thanks! You too ready?!", "Christian is a bit... Embarrased.", JOptionPane.PLAIN_MESSAGE); //display button Action
}
private void button3Clicked(ActionEvent e) {
southBtnPanel.removeAll();
southBtnPanel.add(e2);
southBtnPanel.add(f);
southBtnPanel.add(g);
southBtnPanel.revalidate();
southBtnPanel.repaint();
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "It's ok! Just make sure it doesn't happen again!", "Christian is a bit angry!", JOptionPane.PLAIN_MESSAGE); //display button Action
}
private void button4Clicked(ActionEvent e) {
NestedPanels mainPanel = new NestedPanels(); //mainPanel new class of buttons instantiation
JFrame frame = new JFrame("Date Sim 1.0");//title of webapp on top
frame.getContentPane().add(mainPanel);
JLabel label = new JLabel();
ImageIcon imageTwo = new ImageIcon("C:/Users/wchri/Documents/chrisferry.jpg");
mainPanel.add(label);
label.setIcon(imageTwo);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.getContentPane().add(mainPanel);
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "Let's take the ferry to NYC!", "Christian feels good!", JOptionPane.PLAIN_MESSAGE); //display button Action
}
private void button5Clicked(ActionEvent e) {
NestedPanels mainPanel = new NestedPanels(); //mainPanel new class of buttons instantiation
JFrame frame = new JFrame("Date Sim 1.0");//title of webapp on top
frame.getContentPane().add(mainPanel);
JLabel label = new JLabel();
ImageIcon imageThree = new ImageIcon("C:/Users/wchri/Pictures/Screenshots/chrisart.jpg");
mainPanel.add(label);
label.setIcon(imageThree);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.getContentPane().add(mainPanel);
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "Don't you think it's a bit soon for that?", "Christian is embarrassed...", JOptionPane.PLAIN_MESSAGE); //display button Action
}
private void button6Clicked(ActionEvent e) {
NestedPanels mainPanel = new NestedPanels(); //mainPanel new class of buttons instantiation
JFrame frame = new JFrame("Date Sim 1.0");//title of webapp on top
frame.getContentPane().add(mainPanel);
JLabel label = new JLabel();
ImageIcon imageFour = new ImageIcon("C:/Users/wchri/Downloads/chrismoney.jpg");
mainPanel.add(label);
label.setIcon(imageFour);
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.getContentPane().add(mainPanel);
String msg = ((JButton)e.getSource()).getActionCommand() ;
JOptionPane.showMessageDialog(this, "I got money!", "Christian is ballin'", JOptionPane.PLAIN_MESSAGE); //display button Action
}
public static void main(String[] args) {
System.out.println("Welcome to Date Sim 1.0 with we1. Are you ready to play? Yes/No?");
Scanner in = new Scanner(System.in);
String confirm = in.nextLine();
if (confirm.equalsIgnoreCase("Yes")) {
System.out.println("Ok hot stuff... Let's start.");
NestedPanels mainPanel = new NestedPanels();
} else {
System.out.println("Maybe some other time!");
return;
}
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
createAndShowGui();
}
});
}
}
Here is MCVE that demonstrates changing an icon on a JButton when it is clicked:
import java.io.IOException;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
public class ChangeButtonIcon extends JPanel{
private URL[] urls = {
new URL("https://findicons.com/files/icons/345/summer/128/cake.png"),
new URL("http://icons.iconarchive.com/icons/atyourservice/service-categories/128/Sweets-icon.png"),
new URL("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS_FkBgG3_ux0kCbfG8mcRHvdk1dYbZYsm2SFMS01YvA6B_zfH_kg"),
};
private int iconNumber = 0;
private JButton button;
public ChangeButtonIcon() throws IOException {
button = new JButton();
button.setIcon(new ImageIcon(urls[iconNumber]));
button.setHorizontalTextPosition(SwingConstants.CENTER);
button.addActionListener(e -> swapIcon());
add(button);
}
private void swapIcon() {
iconNumber = iconNumber >= (urls.length -1) ? 0 : iconNumber+1;
button.setIcon(new ImageIcon(urls[iconNumber]));
}
public static void main(String[] args) throws IOException{
JFrame window = new JFrame();
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.add(new ChangeButtonIcon());
window.pack();
window.setVisible(true);
}
}
I find writting MCVE a very useful technique. Not only it makes helping much easier, it
is a powerful debugging tool. It many case, while preparing one, you are likely to find the problem.
It should represent the problem or the question asked. Not your application.
Not sure what my issue is. I created a JFrame and I have a panel that will have 4 large buttons (with graphics - though that isn't coded yet) to show on the frame but I am getting an error when it tries to run this and the panel isn't showing up in the frame.
UPDATED: No error message, but no panel or buttons in the frame...
public class EasyExpress {
private static JFrame frame = new JFrame("EASY BUTTONS");
private JButton WriteBTN = new JButton("Write Email");
private JButton EmailBTN = new JButton("View Emails");
private JButton SolBTN = new JButton("Play Solsuite Solitaire");
private JButton ShutBTN = new JButton("Shutdown Computer");
private JPanel btnPanel;
public EasyExpress() {
/* try {
Image img = ImageIO.read(getClass().getResource("write.jpg"));
WriteBTN.setIcon(new ImageIcon(img));
} catch (IOException ex) {
}*/
btnPanel = new JPanel(new GridLayout(1,4,1,1));
btnPanel.setBounds(0, 0, 1200, 400);
WriteBTN.setPreferredSize(new Dimension(300,400));
EmailBTN.setPreferredSize(new Dimension(300,400));
SolBTN.setPreferredSize(new Dimension(300,400));
ShutBTN.setPreferredSize(new Dimension(300,400));
btnPanel.add(EmailBTN);
btnPanel.add(WriteBTN);
btnPanel.add(SolBTN);
btnPanel.add(ShutBTN);
frame.add(btnPanel);
frame.add(frame);
}
public static void main(String[] args) {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setSize(1200,400);
frame.setVisible(true);
}
Essentially, you're adding a frame to another frame, which you simply can't do
You're also not initialising your buttons, which is causing a NullPointerException.
Start by removing extends JFrame, this is just confusing things and as general rule, you should avoid extending from top level containers. Instead, start with a JPanel, for example...
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class EasyExpress extends JPanel {
JButton WriteBTN, EmailBTN, SolBTN, ShutBTN;
JPanel btnPanel;
public EasyExpress() {
btnPanel = new JPanel(new GridLayout(1, 4, 1, 1));
btnPanel.setBounds(0, 0, 1200, 400);
WriteBTN = new JButton("1");
EmailBTN = new JButton("2");
SolBTN = new JButton("3");
ShutBTN = new JButton("4");
WriteBTN.setPreferredSize(new Dimension(300, 400));
EmailBTN.setPreferredSize(new Dimension(300, 400));
SolBTN.setPreferredSize(new Dimension(300, 400));
ShutBTN.setPreferredSize(new Dimension(300, 400));
btnPanel.add(EmailBTN);
btnPanel.add(WriteBTN);
btnPanel.add(SolBTN);
btnPanel.add(ShutBTN);
setLayout(new BorderLayout());
add(btnPanel);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new EasyExpress());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
Like #MadProgrammer mentioned in the comments above, you can't have a JFrame inside another JFrame.
However, instead of removing the extends JFrame, I would suggest removing the JFrame inside your EasyExpress object. You already set all the properties for that JFrame in your main, so it will be easier to fix.
Remove JFrame frame = new JFrame("EASY BUTTONS");
Add "EASY BUTTONS" to the EasyExpress object you create in main EasyExpress main = new EasyExpress("EASY BUTTONS");
Remove frame. from in front of frame.add(btnPanel);
This question already has answers here:
JFrame not presenting any Components
(4 answers)
Closed 7 years ago.
When i run this code:
public class Menu extends JFrame implements ActionListener {
JLabel logo = new JLabel("MyChef");
JPanel north = new JPanel();
public void main(String args[]){
new Menu();
}
Menu(){
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.setTitle("MyChef");
frame.setSize(500, 300);
frame.setVisible(true);
frame.setResizable(false);
frame.add(north, BorderLayout.NORTH);
north.add(logo);
}
public void actionPerformed(ActionEvent e){
}
}
The window opens but it does not show anything... Where is my label? I am very lost because I have done various GUI before and either I am being stupid or i don't know! Sorry if its a stupid question, I'm just so stuck I had to post this.
Your code works for me, but I think it doesn't for you because you add a component after you set the frame visible. Call frame.setVisible(true) (and setSize) after
frame.add(north, BorderLayout.NORTH);
north.add(logo);
So your code should look like this (also formatted it properly):
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Menu extends JFrame implements ActionListener {
JLabel logo = new JLabel("MyChef");
JPanel north = new JPanel();
public static void main(String args[]) {
new Menu();
}
public Menu() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.setTitle("MyChef");
frame.setResizable(false);
frame.add(north, BorderLayout.NORTH);
north.add(logo);
frame.setSize(500, 300);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
}
}
I am trying to write a very simple Blackjack game.
This is the class that is supposed to show the currently drawn card:
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
public class ShowRandomCard {
JFrame f = new JFrame();
JPanel p = new JPanel();
public void ShowUsARandomCard() {
f.setLayout(new BorderLayout());
p.add(new JLabel("A Panel"));
f.add(p, BorderLayout.NORTH);
// Picture
BufferedImage myPicture = null;
try {
myPicture = ImageIO.read(new File("somepicture"));
} catch (IOException e) {
e.printStackTrace();
}
JLabel picLabel = new JLabel(new ImageIcon(myPicture));
f.add(picLabel,BorderLayout.NORTH);
// elements
f.pack();
f.setVisible(true);
Blackjack jt = new Blackjack();
jt.dialog();
}
public void hideCards() {
f.setVisible(false);
f.remove(p);
f.dispose();
f.repaint();
}
}
And this is the actual game class:
import static javax.swing.JOptionPane.*;
public class Blackjack {
ShowRandomCard it = new ShowRandomCard();
public void dialog() {
int answer2 = showConfirmDialog(null, "some message", "some title",
YES_NO_OPTION);
if (answer2 == YES_OPTION) {
garbageCollection();
it.ShowUsARandomCard();
if (answer2 == NO_OPTION || answer2 == CANCEL_OPTION) {
garbageCollection();
// System.exit(0);
}
}
}
public void garbageCollection() {
it.hideCards();
}
}
But the JPanel that holds the cards does not disappear.
Any help would be appreciated.
When you remove a component from a visible frame the basic code is:
panel.remove(...);
panel.revalidate();
panel.repaint();
However, there is rarely a good reason to use code like that. Instead you should be using a Card Layout to hide/show panels.
Method names do not start with an upper case character. "GarbageCollection()" should be GarbageCollection()