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How to switch JPanel from different classes with mouseClicked?

I'm learning javax.swing right now and I'm just trying some things out. But now I'm facing a problem I just can't solve. When I click the JLabel for changing the page (jpanel), nothing happens. It won't remove and show the other jpanel.
I also added a
public final HomeGUI getMainFrame() {
return this;
}
and at the mouseClicked(MouseEvent e)
gui.getMainFrame().removeAll();
and I tried it also with
gui.getMainFrame().mainPanel.removeAll();
My GUI:
public class HomeGUI extends JFrame {
private static final long serialVersionUID = 1L;
JPanel mainPanel = new JPanel(new CardLayout());
final CardLayout cl = new CardLayout();
final JPanel mainPanel = new JPanel(cl);
Panel panel;
Page2 page2;
public HomeGUI() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(1200, 650);
this.setTitle("Terminal");
this.setLocationRelativeTo(null);
this.setLayout(new BorderLayout(1,1));
panel = new Panel();
panel.Inhalt();
page2 = new Page2();
page2.Inhalt();
this.add(mainPanel);
mainPanel.add(panel, "Seite1");
mainPanel.add(page2, "Seite2");
cl.show(mainPanel, "panel");
}
public static void main(String[] args) {
HomeGUI terminal = new HomeGUI();
terminal.setResizable(false);
terminal.setVisible(true);
}
}
the Panel:
class Panel extends JPanel {
private HomeGUI gui;
Page2 page2;
private static final long serialVersionUID = 1L;
JPanel Panel;
JLabel title = new JLabel("Willkommen");
JLabel bgc = new JLabel("");
JLabel menuStrich = new JLabel();
JLabel menuTitle = new JLabel("Menu");
JLabel menuHome = new JLabel("Home");
JLabel menuSeite2 = new JLabel("Seite2");
public void Inhalt() {
this.setBackground(new Color(230, 230, 230));
this.add(title);
this.add(bgc);
this.setLayout(null);
//Seite1
title.setSize(300, 50);
title.setLocation(300, 20);
title.setFont(new Font("Alba Matter", Font.PLAIN, 48));
//Menu
bgc.setLayout(null);
bgc.setOpaque(true);
bgc.setBackground(new Color(66, 78, 245));
bgc.setSize(280, 650);
bgc.setLocation(0, 0);
bgc.add(menuTitle);
bgc.add(menuStrich);
bgc.add(menuHome);
bgc.add(menuSeite2);
menuTitle.setLocation(90, 10);
menuTitle.setSize(100, 50);
menuTitle.setFont(new Font("Bahnschrift", Font.PLAIN, 38));
menuTitle.setForeground(Color.white);
menuStrich.setLocation(10, 55);
menuStrich.setSize(260, 5);
menuStrich.setBackground(new Color(240, 240, 240));
menuStrich.setOpaque(true);
menuHome.setLocation(30, 70);
menuHome.setSize(200, 50);
menuHome.setFont(new Font("Concert One", Font.PLAIN, 36));
menuHome.setForeground(Color.white);
menuSeite2.setLocation(30, 130);
menuSeite2.setSize(200, 50);
menuSeite2.setForeground(Color.LIGHT_GRAY);
menuSeite2.setFont(new Font("Concert One", Font.PLAIN, 32));
menuSeite2.addMouseListener(new menuSeite2Event());
}
private class menuSeite2Event extends MouseAdapter {
#Override
public void mouseClicked(MouseEvent e) {
//show page2
gui.cl.show(gui.mainPanel, "page2");
}
#Override
public void mouseEntered(MouseEvent e) {
menuSeite2.setForeground(Color.CYAN);
}
#Override
public void mouseExited(MouseEvent e) {
menuSeite2.setForeground(Color.LIGHT_GRAY);
}
}
}
class Page2 extends JPanel {
private static final long serialVersionUID = 1L;
JPanel Panel;
JLabel title = new JLabel("Willkommen");
JLabel bgc = new JLabel("");
JLabel menuStrich = new JLabel();
JLabel menuTitle = new JLabel("Menu");
JLabel menuHome = new JLabel("Home");
JLabel menuSeite2 = new JLabel("Seite2");
public void Inhalt() {
this.setBackground(new Color(230, 230, 230));
this.add(title);
this.add(bgc);
this.setLayout(null);
//Seite1
title.setSize(300, 50);
title.setLocation(300, 20);
title.setFont(new Font("Alba Matter", Font.PLAIN, 48));
//Menu
bgc.setLayout(null);
bgc.setOpaque(true);
bgc.setBackground(new Color(66, 78, 245));
bgc.setSize(280, 650);
bgc.setLocation(0, 0);
bgc.add(menuTitle);
bgc.add(menuStrich);
bgc.add(menuHome);
bgc.add(menuSeite2);
menuTitle.setLocation(90, 10);
menuTitle.setSize(100, 50);
menuTitle.setFont(new Font("Bahnschrift", Font.PLAIN, 38));
menuTitle.setForeground(Color.white);
menuStrich.setLocation(10, 55);
menuStrich.setSize(260, 5);
menuStrich.setBackground(new Color(240, 240, 240));
menuStrich.setOpaque(true);
menuHome.setLocation(30, 70);
menuHome.setSize(200, 50);
menuHome.setFont(new Font("Concert One", Font.PLAIN, 36));
menuHome.setForeground(Color.white);
menuHome.addMouseListener(new menuHomeEvent());
menuSeite2.setLocation(30, 130);
menuSeite2.setSize(200, 50);
menuSeite2.setForeground(Color.white);
menuSeite2.setFont(new Font("Concert One", Font.PLAIN, 32));
}
private class menuHomeEvent extends MouseAdapter {
#Override
public void mouseClicked(MouseEvent e) {
//show Home
}
#Override
public void mouseEntered(MouseEvent e) {
menuHome.setForeground(Color.CYAN);
}
#Override
public void mouseExited(MouseEvent e) {
menuHome.setForeground(Color.LIGHT_GRAY);
}
}
}
INFO: all classes are in 1 file.

How to restart the screen with action listener?

I was looking in to my Java project when I realized I have yet to make my title screen. But one problem came to mind: How do I make it in where when they press on the new file button it will clear everything on the screen and put the new stuff in?
In simpler words, how to make a action listener so when they click the button the screen will clear and put a new screen on?
package Main_Config;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
public class SET_UP extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JLabel consol;
public static Dimension size = new Dimension(800, 700);
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
SET_UP frame = new SET_UP();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public SET_UP() {
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(370, 70, 0, 0);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
setSize(size);
setLocationRelativeTo(null);
textField = new JTextField();
textField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String input = textField.getText();
consol.setText(input);
}
});
textField.setBounds(10, 452, 243, 20);
contentPane.add(textField);
textField.setColumns(10);
JButton enter = new JButton("Enter");
enter.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
enter.setBounds(253, 452, 89, 20);
contentPane.add(enter);
JLabel consol = new JLabel("");
consol.setBounds(0, 483, 335, 189);
contentPane.add(consol);
JButton btnNewButton = new JButton("New button");
btnNewButton.setBounds(352, 451, 200, 23);
contentPane.add(btnNewButton);
JButton btnNewButton_1 = new JButton("New button");
btnNewButton_1.setBounds(584, 451, 200, 23);
contentPane.add(btnNewButton_1);
JButton btnNewButton_2 = new JButton("New button");
btnNewButton_2.setBounds(0, 0, 89, 23);
contentPane.add(btnNewButton_2);
}
}

To clear the screen, I do this:
Button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
frame.setVisible(false);
frame.remove(panelTwo);
frame.remove(panelThree);
frame.add(panelFour);
frame.setVisible(true);
}
});

How should I make a "back button" to switch JPanels on a main JFrame class work with multiple JPanel classes?

I'm currently working on a game for school, and I've hit a brick wall. I've created a main class that sets up the JFrame, and in that JFrame have JPanel buttons that open a server JPanel class, a client JPanel class, and buttons for options, and exiting the game. Now where I'm stuck is how I should make buttons to go back to the main JPanel using a back button on the server/client JPanel class. Here's the code I have at the moment:
MainUI.class (a different class runs this):
public class MainUI extends JFrame {
private JPanel contentPane;
private JTextField textField;
public MainUI() {
// Sets up the frame
setTitle("Pong Legacy | Prototype v0.1.0");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 500);
setLocationRelativeTo(null);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
// Starts the Server window
JButton btnStartServer = new JButton("Start Server");
btnStartServer.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JPanel server = new ServerUI();
getContentPane().removeAll();
getContentPane().setLayout(new BorderLayout());
getContentPane().add(server);
getContentPane().validate();
getContentPane().repaint();
}
});
btnStartServer.setBounds(97, 364, 100, 25);
contentPane.add(btnStartServer);
// Starts the Client window
JButton btnStartClient = new JButton("Start Client");
btnStartClient.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JPanel client = new ClientUI();
getContentPane().removeAll();
getContentPane().setLayout(new BorderLayout());
getContentPane().add(client);
getContentPane().validate();
getContentPane().repaint();
}
});
btnStartClient.setBounds(97, 400, 100, 25);
contentPane.add(btnStartClient);
// Opens the Options menu
// (To Do)
JButton btnOptions = new JButton("Options");
btnOptions.setBounds(37, 436, 100, 25);
contentPane.add(btnOptions);
// Quits the game
JButton btnQuitGame = new JButton("Quit Game");
btnQuitGame.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnQuitGame.setBounds(157, 436, 100, 25);
contentPane.add(btnQuitGame);
// Username Field
JLabel lblUsername = new JLabel("Username:");
lblUsername.setBounds(121, 45, 52, 14);
contentPane.add(lblUsername);
textField = new JTextField();
textField.setBounds(104, 67, 86, 20);
contentPane.add(textField);
textField.setColumns(10);
}
}
ServerUI.class:
public class MainUI extends JFrame {
private JPanel contentPane;
private JTextField textField;
public MainUI() {
// Sets up the frame
setTitle("Pong Legacy | Prototype v0.1.0");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 500);
setLocationRelativeTo(null);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
// Starts the Server window
JButton btnStartServer = new JButton("Start Server");
btnStartServer.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JPanel server = new ServerUI();
getContentPane().removeAll();
getContentPane().setLayout(new BorderLayout());
getContentPane().add(server);
getContentPane().validate();
getContentPane().repaint();
}
});
btnStartServer.setBounds(97, 364, 100, 25);
contentPane.add(btnStartServer);
// Starts the Client window
JButton btnStartClient = new JButton("Start Client");
btnStartClient.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JPanel client = new ClientUI();
getContentPane().removeAll();
getContentPane().setLayout(new BorderLayout());
getContentPane().add(client);
getContentPane().validate();
getContentPane().repaint();
}
});
btnStartClient.setBounds(97, 400, 100, 25);
contentPane.add(btnStartClient);
// Opens the Options menu
// (To Do)
JButton btnOptions = new JButton("Options");
btnOptions.setBounds(37, 436, 100, 25);
contentPane.add(btnOptions);
// Quits the game
JButton btnQuitGame = new JButton("Quit Game");
btnQuitGame.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnQuitGame.setBounds(157, 436, 100, 25);
contentPane.add(btnQuitGame);
// Username Field
JLabel lblUsername = new JLabel("Username:");
lblUsername.setBounds(121, 45, 52, 14);
contentPane.add(lblUsername);
textField = new JTextField();
textField.setBounds(104, 67, 86, 20);
contentPane.add(textField);
textField.setColumns(10);
}
}
ClientUI.class:
public class ClientUI extends JPanel {
private JTextField textField;
public ClientUI() {
setLayout(null);
JButton btnConnect = new JButton("Connect");
btnConnect.setBounds(47, 400, 200, 25);
add(btnConnect);
JButton btnBack = new JButton("Back");
btnBack.setBounds(117, 436, 60, 25);
add(btnBack);
JRadioButton rdbtnSelectAServer = new JRadioButton("Select a server from the list:");
rdbtnSelectAServer.setBounds(66, 25, 161, 25);
add(rdbtnSelectAServer);
JRadioButton rdbtnManualConnection = new JRadioButton("Manual Connection:");
rdbtnManualConnection.setBounds(87, 325, 120, 25);
add(rdbtnManualConnection);
textField = new JTextField();
textField.setBounds(47, 355, 200, 25);
add(textField);
textField.setColumns(10);
}
}
I've heard that I could use a CardLayout, too, but I want to see if I can do it this way.

JButtons Wont Display?

I'm sorry for posting this but, I can't find out why my Array of JButtons won't display in my ButtonsPanel. After adding them, I tried using my code in a separate class to test my code and it worked!, but why don't my buttons show up in this class?
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.LineBorder;
public class WordGui extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JLabel lblNewLabel_1;
private JPanel buttonPanel;
private JTextArea txtrShuffleHistory;
private Word word ;
private boolean val;
private JButton btnGo;
private JButton button;
private JButton btnShuffleText;
private JPanel panel_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
com.jtattoo.plaf.noire.NoireLookAndFeel.setTheme("Small-Font","","05:Bageo,Dexter");
UIManager.setLookAndFeel("com.jtattoo.plaf.noire.NoireLookAndFeel");
} catch (Throwable e) {
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
WordGui frame = new WordGui();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public WordGui() {
setTitle("Word App Gui");
setResizable(false);
setBounds(new Rectangle(100, 100, 600, 200));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 719, 394);
contentPane = new JPanel();
contentPane.setBounds(new Rectangle(100, 100, 600, 200));
contentPane.setSize(new Dimension(600, 250));
contentPane.setPreferredSize(new Dimension(600, 250));
contentPane.setBorder(new LineBorder(new Color(204, 0, 255), 5, true));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBorder(new LineBorder(new Color(204, 0, 255), 3, true));
panel.setBounds(10, 11, 683, 45);
contentPane.add(panel);
panel_1 = new JPanel();
panel_1.setBorder(new LineBorder(new Color(204, 0, 255), 3, true));
panel_1.setBounds(140, 59, 553, 286);
contentPane.add(panel_1);
panel_1.setLayout(null);
JLabel lblNewLabel = new JLabel("Enter a new word here:");
lblNewLabel.setBounds(10, 11, 183, 14);
panel_1.add(lblNewLabel);
textField = new JTextField();
textField.setBounds(224, 8, 157, 20);
panel_1.add(textField);
textField.setColumns(10);
btnGo = new JButton("Go");
btnGo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
if(ev.getSource()== btnGo){
assignWord(textField.getText());
}
}
});
btnGo.setBounds(391, 7, 57, 23);
panel_1.add(btnGo);
JLabel lblOriginalText = new JLabel("Original Text:");
lblOriginalText.setBounds(10, 36, 84, 14);
panel_1.add(lblOriginalText);
lblNewLabel_1 = new JLabel("New label");
lblNewLabel_1.setToolTipText("This is the original text entered\r\n");
lblNewLabel_1.setHorizontalTextPosition(SwingConstants.CENTER);
lblNewLabel_1.setHorizontalAlignment(SwingConstants.CENTER);
lblNewLabel_1.setBorder(new LineBorder(new Color(204, 0, 255), 3, true));
lblNewLabel_1.setBounds(90, 36, 358, 79);
panel_1.add(lblNewLabel_1);
JLabel lblShuffledText = new JLabel("Shuffled Text:");
lblShuffledText.setBounds(10, 126, 110, 14);
panel_1.add(lblShuffledText);
buttonPanel = new JPanel();
buttonPanel.setBorder(new LineBorder(new Color(204, 0, 255), 4, true));
buttonPanel.setBounds(10, 147, 533, 56);
panel_1.add(buttonPanel);
buttonPanel.setLayout(new GridLayout(1, 0, 0, 0));
btnShuffleText = new JButton("Shuffle Text");
btnShuffleText.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
if(ev.getSource() == btnShuffleText){
shuffle();
}
}
});
btnShuffleText.setBounds(90, 214, 196, 39);
panel_1.add(btnShuffleText);
button = new JButton("Reset");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
if(ev.getSource() == button){
textField.setText("");
getGoBtn().setEnabled(true);
getShuffleBtn().setEnabled(false);
getButtonPanel().removeAll();
}
}
});
button.setBounds(294, 214, 196, 39);
panel_1.add(button);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setBounds(10, 59, 128, 258);
contentPane.add(scrollPane);
txtrShuffleHistory = new JTextArea();
txtrShuffleHistory.setToolTipText("View Shuffle History");
txtrShuffleHistory.setText("Shuffle History\r\n=================");
txtrShuffleHistory.setEditable(false);
scrollPane.setViewportView(txtrShuffleHistory);
JButton btnClear = new JButton("Clear");
btnClear.setBounds(10, 322, 126, 23);
contentPane.add(btnClear);
valid();
}
public void valid(){
JTextField field = new JTextField();
while(val == false){
int result = JOptionPane.showConfirmDialog(null,field, "Enter a Text?", JOptionPane.OK_CANCEL_OPTION);
if(result == JOptionPane.OK_OPTION){
String s = field.getText();
assignWord(s);
}
else if(result == JOptionPane.CANCEL_OPTION){
getResetBtn().setEnabled(false);
getShuffleBtn().setEnabled(false);
val = true;
}
}
}
public void assignWord(String s){
try{word = new Word(s);
val = true;
getTextLabel().setText("<html><body><font size = 30 >"+s+"</font></body></html>");
getTextArea().append("\nOriginal Word :"+s+"\n=================");
getGoBtn().setEnabled(false);
getResetBtn().setEnabled(true);
getShuffleBtn().setEnabled(true);
}
catch(RuntimeException e){JOptionPane.showMessageDialog(getParent(),e.getMessage()); val = false;}
}
public void shuffle(){
word.shuffle();
getButtonPanel().removeAll();
String temp = word.getShuffledText();
JButton[] buttons = new JButton[word.getText().length()];
for(int x = 0; x < word.getShuffledText().length(); x++){
buttons[x] = new JButton(""+temp.charAt(x));
getBody().add(buttons[x]);
buttons[x].setVisible(true);
}
getTextArea().append("\n"+word.getShuffledText());
}
public JLabel getTextLabel() {
return lblNewLabel_1;
}
public JPanel getButtonPanel() {
return buttonPanel;
}
public JTextArea getTextArea() {
return txtrShuffleHistory;
}
public JTextField getTextField() {
return textField;
}
public JButton getGoBtn() {
return btnGo;
}
public JButton getResetBtn() {
return button;
}
public JButton getShuffleBtn() {
return btnShuffleText;
}
public JPanel getBody() {
return panel_1;
}
}
I have the shuffle method which does the adding of JButtons, I'm sorry for posting this long long code, but can somebody compile this and figure out why the buttons wont show ? I tried changing the panels layout but still doesn't work,
here's the supporting class
import java.util.*;
public class Word {
private String text;
private List<Character> charList;
private String shuffled;
public Word(String str) {
if (str.length() < 3) {
throw new RuntimeException("Word must be more than 2 characters...");
}
if(invalid(str)) {
throw new RuntimeException("Word must not be composed of a single character...");
}
text = str.toUpperCase();
charList = getChars();
shuffle();
}
private boolean invalid(String s) {
int count = 1;
for (int i = 1; i < s.length(); i++) {
if (Character.toLowerCase(s.charAt(0)) == Character.toLowerCase(s.charAt(i)))
count++;
}
return (count == s.length());
}
private ArrayList<Character> getChars() {
ArrayList<Character> tempList = new ArrayList<Character>();
for (int i = 0; i < text.length(); i++) {
tempList.add(text.charAt(i));
}
return tempList;
}
public void shuffle() {
String orig = shuffled;
String tempShuffled;
do {
Collections.shuffle(charList);
tempShuffled = listToString();
} while (tempShuffled.equals(orig) || tempShuffled.equals(text));
shuffled = tempShuffled;
}
private String listToString() {
String strTemp = "";
for (Character ch: charList) {
strTemp += ch;
}
return strTemp;
}
public String toString() {
return text;
}
public String getShuffledText() {
return shuffled;
}
public String getText(){
return text;
}
}

You're using absolute positioning (null layout) for the JPanel panel_1. Each component in the JButton array buttons will have a default size of 0 x 0 so will not appear.
Swing was designed to use a layout manager so its recommended to always use one.
It removes the need to set component dimensions and locations. Use one for panel_1, such as GridLayout.
Also invoke
panel_1.revalidate();
panel_1.repaint();
after adding all of the buttons from the array.
Aside: Java naming conventions show that variables use camelCase such as panelOne instead of panel_1.

panel_1.setLayout(null);
Here, you're basically left with absolute positioning, so you'll need to set size and position for each of your JButtons. Use setBounds

Java, runing "textArea = new JTextArea()" taking too much time

Something strange happened to me. For some reason, it takes a long time(1.60900 seconds) till it runs the following line:
textArea = new JTextArea();
I declared textArea variable as globally.
This only happens in one window (Jframe). In others it does not happen.
public class FAQ extends JFrame
{
/*--------attributes--------*/
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JPanel panel;
private JScrollPane scrollPaneInput;
private JScrollPane scrollPaneQuestions;
private JPanel paneQuestions;
private JPanel paneSelectOrNewFAQ;
private JButton btnEditSelection;
private JButton btnNewFAQ;
public JTextArea textArea;
private JLabel lblQuestions;
public JList list;
private User user;
private FAQ currentWindow;
private int selectedFaq = 0;
private DatabaseManager DManager;
private Vector<FAQ_class> Faqs = new Vector<FAQ_class>();
private JButton btnNewButton;
/*--------methods--------*/
public FAQ(User _user,DatabaseManager DM)
{
setResizable(false);
DManager = DM;
addWindowStateListener(new WindowStateListener() {
public void windowStateChanged(WindowEvent arg0) {
}
});
addWindowListener(new WindowAdapter() {
#Override
public void windowClosed(WindowEvent arg0) {
Menu menu = new Menu(user,DManager);
menu.setVisible(true);
}
});
currentWindow = this;
user = _user;
addGui();
if(!user.rule.equals("patient"))
{
btnEditSelection.setEnabled(true);
btnNewFAQ.setEnabled(true);
}
loadFaqs();
}//end of FAQ
public void loadFaqs()
{
Faqs = DManager.getQuestionsList();
Vector<String> temp = new Vector<String>();
for(int i = 0 ; i < Faqs.size();i++)
{
temp.addElement(Faqs.get(i).question);
}
list.setListData(temp);
}
public void addGui()
{
setTitle("FAQ - Online medical help");
setIconImage(Toolkit.getDefaultToolkit().getImage(FAQ.class.getResource("/Images/question.png")));
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setBounds(100, 100, 708, 438);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new GridLayout(1, 0, 0, 0));
addPanel();
addPanes();
addButtons();
addGroupLayout();
addJTextArea();
}//end of addGui
public void addPanel()
{
panel = new JPanel();
panel.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.add(panel);
}//end of addPanel
public void addPanes()
{
scrollPaneInput = new JScrollPane();
scrollPaneInput.setBounds(327, 0, 365, 398);
paneQuestions = new JPanel();
paneQuestions.setBounds(0, 0, 317, 38);
paneQuestions.setBackground(new Color(154, 205, 50));
}//end of addScrollPanes
public void addButtons()
{
}//end of addButtons
public void addJTextArea()
{
textArea = new JTextArea();
textArea.setEditable(false);
textArea.setFont(new Font("Courier New", Font.PLAIN, 14));
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.setAlignmentX(Component.RIGHT_ALIGNMENT);
scrollPaneInput.setViewportView(textArea);
}//end of addJTextArea
public void addGroupLayout()
{
lblQuestions = new JLabel("Questions");
lblQuestions.setHorizontalAlignment(SwingConstants.CENTER);
lblQuestions.setBounds(0, 0, 317, 38);
lblQuestions.setForeground(new Color(255, 255, 255));
lblQuestions.setFont(new Font("Tahoma", Font.BOLD, 22));
panel.setLayout(null);
scrollPaneQuestions = new JScrollPane();
scrollPaneQuestions.setBounds(0, 37, 317, 318);
list = new JList();
list.setSelectionBackground(new Color(154, 205, 50));
list.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent arg0) {
try
{
for(int i = 0; i<Faqs.size();i++)
{
if(!list.isSelectionEmpty())
if(Faqs.get(i).question.equals(list.getSelectedValue().toString()))
{
textArea.setText(Faqs.get(i).answer);
selectedFaq = i;
break;
}
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
});
scrollPaneQuestions.setViewportView(list);
panel.add(scrollPaneQuestions);
panel.add(paneQuestions);
paneQuestions.setLayout(null);
paneQuestions.add(lblQuestions);
panel.add(scrollPaneInput);
paneSelectOrNewFAQ = new JPanel();
paneSelectOrNewFAQ.setBounds(0, 348, 317, 50);
btnEditSelection = new JButton("Edit Selected");
btnEditSelection.setBounds(68, 11, 131, 40);
btnEditSelection.setEnabled(false);
btnEditSelection.addActionListener(new ActionListener() {
//open EditFAQ to edit FAQ
public void actionPerformed(ActionEvent e) {
if(!list.isSelectionEmpty())
{
EditFAQ faq = new EditFAQ(user,Faqs.get(selectedFaq),currentWindow,DManager);
faq.setVisible(true);
currentWindow.setEnabled(false);
}
else
{
JOptionPane.showMessageDialog(null,"You must select for the list first.");
}
}
});
btnEditSelection.setIcon(new ImageIcon(FAQ.class.getResource("/Images/tool.png")));
btnNewFAQ = new JButton("New FAQ");
btnNewFAQ.setBounds(203, 11, 114, 40);
btnNewFAQ.setEnabled(false);
btnNewFAQ.addActionListener(new ActionListener() {
//open EditFAQ to make new FAQ
public void actionPerformed(ActionEvent e) {
EditFAQ faq = new EditFAQ(user,null,currentWindow,DManager);
faq.setVisible(true);
currentWindow.setEnabled(false);
}
});
btnNewFAQ.setMinimumSize(new Dimension(95, 23));
btnNewFAQ.setMaximumSize(new Dimension(95, 23));
btnNewFAQ.setPreferredSize(new Dimension(95, 23));
btnNewFAQ.setIcon(new ImageIcon(FAQ.class.getResource("/Images/add.png")));
btnNewButton = new JButton("");
btnNewButton.setBounds(0, 10, 42, 41);
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
}
});
btnNewButton.setIcon(new ImageIcon(FAQ.class.getResource("/Images/left.png")));
panel.add(paneSelectOrNewFAQ);
paneSelectOrNewFAQ.setLayout(null);
paneSelectOrNewFAQ.add(btnNewButton);
paneSelectOrNewFAQ.add(btnEditSelection);
paneSelectOrNewFAQ.add(btnNewFAQ);
}//end of addGroupLayout
}//end of class

Something strange happened to me. For some reason, it takes a long time(5 second~) till it runs the following line: Run this class and give me the result:
import java.text.DecimalFormat;
import java.text.NumberFormat;
import javax.swing.JTextArea;
public class JTextAreaRunningTime {
JTextArea textArea;
public JTextAreaRunningTime(){
long startTime = System.currentTimeMillis();
textArea = new JTextArea();
long endTime = System.currentTimeMillis();
NumberFormat nf = new DecimalFormat("#0.00000");
String totalTime = nf.format((endTime-startTime)/1000d);
System.out.println("Execution time is " + totalTime + " seconds");
}
public static void main (String...argW){
new JTextAreaRunningTime();
}
}