3 Jpanel in JFrame, my button is not visible

3 Jpanel in JFrame, my button is not visible - java

I have a JFrame with three JPanel objects. I have a problem with two of the panels. I can see in my frame, the panel JPanelProduit with object but for the panel, JPanelInformations and JPanelVentes, I see nothing. Where is my error?
My Code
package IHM;
import javax.swing.*;
import Donnees.Categories;
import Donnees.CategoriesCellRenderer;
import Donnees.CategoriesListModel;
import Donnees.Marques;
import Donnees.MarquesCellRenderer;
import Donnees.MarquesListModel;
import Donnees.Produits;
import Donnees.ProduitsCellRenderer;
import Donnees.ProduitsListModel;
import Fabriques.FabCategories;
import Fabriques.FabMarques;
import java.awt.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Fenetre {
static Connection conn;
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Class.forName("org.hsqldb.jdbcDriver");
conn=DriverManager.getConnection("jdbc:hsqldb:file:BDD/bdd","sa","");
FabCategories.getInstance().demarrerConnexion(conn);
FabMarques.getInstance().demarrerConnexion(conn);
JFrame f = new JFrame("Gestion des Produits");
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setLayout(new GridLayout(1,2,3, 3));
JPanelProduit jPanelProduit = new JPanelProduit();
JPanelInformations jPanelInformations = new JPanelInformations();
JPanelVentes jPanelVentes = new JPanelVentes();
jPanelProduit.setBackground(Color.GREEN);
jPanelProduit.setBackground(Color.YELLOW);
jPanelVentes.setBackground(Color.PINK);
f.add(jPanelProduit);
f.add(jPanelInformations);
f.add(jPanelVentes);
f.setSize(700,700);
f.pack();
f.setVisible(true);
}
}
class JPanelProduit extends JPanel {
public JPanelProduit() throws SQLException {
setLayout(new GridLayout(5,2,5,5));
String labelCat = "Categories";
String labelMark = "Marques";
String labelProd = "Produits";
JList<Categories> listCategories= new JList<Categories> ();
JList<Marques> listMarques= new JList<Marques> ();
JList<Produits> listProduits= new JList<Produits> ();
JScrollPane listCategoriesScrollPane = new JScrollPane (listCategories);
add(new JLabel(labelCat));
add(new JScrollPane(listCategoriesScrollPane));
listCategories.setCellRenderer(new CategoriesCellRenderer());;
listCategories.setModel(new CategoriesListModel());
add(new JLabel(labelMark));
JScrollPane listMarquesScrollPane = new JScrollPane (listMarques);
add(new JScrollPane(listMarquesScrollPane));
listMarques.setCellRenderer(new MarquesCellRenderer());
listMarques.setModel(new MarquesListModel());
add(new JLabel(labelProd));
JScrollPane listProduitScrollPane = new JScrollPane (listProduits);
add(new JScrollPane(listProduitScrollPane));
//listProduits.setCellRenderer(new ProduitsCellRenderer());
//listProduits.setModel(new ProduitsListModel());
}
}
class JPanelInformations extends JPanel {
public JPanelInformations() {
JPanel PanelInformation = new JPanel();
setLayout(new GridLayout(7,1,5,5));
JLabel labelInfo = new JLabel ("INFORMATION");
JLabel labelPrix = new JLabel ("Prix");
JLabel labelDesc = new JLabel ("Description");
JLabel labelQuant = new JLabel ("Quantite");
JTextField fieldPrix = new JTextField (20);
JTextArea fieldDesc = new JTextArea (20, 20);
JTextField fieldQuantite = new JTextField (20);
PanelInformation.add(labelInfo);
PanelInformation.add(labelPrix);
PanelInformation.add(fieldPrix);
PanelInformation.add(labelDesc);
PanelInformation.add(fieldDesc);
PanelInformation.add(labelQuant);
PanelInformation.add(fieldQuantite);
}
}
class JPanelVentes extends JPanel {
public JPanelVentes() {
JPanel PanelVentes = new JPanel();
setLayout(new GridLayout());
JLabel labelVendre = new JLabel ("VENDRE");
JLabel labelQte = new JLabel ("Quantite");
JLabel labelPromo = new JLabel ("Promotion");
JLabel labelTot = new JLabel ("Total");
JTextField fieldQte = new JTextField (20);
JTextField fieldPromoEuros = new JTextField (20);
JTextField fieldPromoPourcent = new JTextField (20);
JTextField fieldTotal = new JTextField (20);
PanelVentes.add (labelVendre);
PanelVentes.add (labelQte);
PanelVentes.add (fieldQte);
PanelVentes.add (labelPromo);
PanelVentes.add (fieldPromoEuros);
PanelVentes.add (fieldPromoPourcent);
PanelVentes.add (labelTot);
PanelVentes.add (fieldTotal);
}
}

The JPanelInformations in the constructor creates a local instance JPanel PanelInformation = new JPanel(); which is not added to main panel.
You should either add it to this or get rid of it at all and add all the labels to this directly.
The same with JPanelVentes

Inside JPanelInformations class you are creating new JPanel class PanelInformation and adding other elements in it. You should just call add() as JPanelInformations already extends JPanel and you are creating instance of JPanelVentes class.
So follow same JPanel logic you have used in JPanelProduit class.
Same goes for JPanelVentes as well.
Also take care of naming conventions. Makes life easy
JPanel panelVentes = new JPanel();

Try out this:
public JPanelInformations() {
//JPanel PanelInformation = new JPanel(); remove new instance of panel
setLayout(new GridLayout(7,1,5,5));
JLabel labelInfo = new JLabel ("INFORMATION");
JLabel labelPrix = new JLabel ("Prix");
JLabel labelDesc = new JLabel ("Description");
JLabel labelQuant = new JLabel ("Quantite");
JTextField fieldPrix = new JTextField (20);
JTextArea fieldDesc = new JTextArea (20, 20);
JTextField fieldQuantite = new JTextField (20);
add(labelInfo); //remove PanelInformation.
add(labelPrix);//remove PanelInformation.
add(fieldPrix);//remove PanelInformation.
add(labelDesc);//remove PanelInformation.
add(fieldDesc);//remove PanelInformation.
add(labelQuant);//remove PanelInformation.
add(fieldQuantite);//remove PanelInformation.
}
AND
public JPanelVentes() {
//JPanel PanelVentes = new JPanel(); remove the new instance of JPanel
setLayout(new GridLayout());
JLabel labelVendre = new JLabel ("VENDRE");
JLabel labelQte = new JLabel ("Quantite");
JLabel labelPromo = new JLabel ("Promotion");
JLabel labelTot = new JLabel ("Total");
JTextField fieldQte = new JTextField (20);
JTextField fieldPromoEuros = new JTextField (20);
JTextField fieldPromoPourcent = new JTextField (20);
JTextField fieldTotal = new JTextField (20);
add (labelVendre); //remove PanelVentes
add (labelQte);//remove PanelVentes
add (fieldQte);//remove PanelVentes
add (labelPromo);//remove PanelVentes
add (fieldPromoEuros);//remove PanelVentes
add (fieldPromoPourcent);//remove PanelVentes
add (labelTot);//remove PanelVentes
add (fieldTotal);//remove PanelVentes
}

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Nothing Displayed On Screen Java Swing Application

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SimultaneousSolver extends JFrame implements ActionListener
{
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JTextField tfEQ1Y = new JTextField (20);
JTextField tfEQ1Num = new JTextField (20);
JTextField tfEQ2X = new JTextField (20);
JTextField tfEQ2Y = new JTextField (20);
JTextField tfEQ2Num = new JTextField (20);
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JTextArea Empty = new JTextArea ("",1,20);
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panelEquation1.add(lblNum1);
panelEquation1.add(tfEQ1Num);
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Add these two lines at the end of constructor.
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changing color for the square textfield

I'm trying to create a layout that would take 3 RGB colors and change the background of the textfield but I'm not able to do so.
package Quizzes_practice;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
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import javax.swing.JLabel;
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import javax.swing.JRadioButton;
import javax.swing.JTextField;
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private JPanel down;
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//JPanel center = new JPanel();
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//center.setLayout(new FlowLayout());
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I'm not getting an error, it's just not happening, the condition I believe is incorrect

You're shadowing your JTextField variables. Replace
JTextField r_text = new JTextField(4);
with
r_text = new JTextField(4);
The same applys to the other color components.
Aside: Consider using JColorChooser. Read How to Use Color Choosers

Java swing timer not decrementing the right way and not starting at the correct hour

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
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/**
* #param args
*/
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//space to help button line up with text
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spacer1.setBackground(Color.lightGray);
questionPanel.add(spacer1);
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spacePanel2.setBackground(Color.lightGray);
upperPanel.add(spacePanel1);
upperPanel.add(spacePanel2);
//adding the submit button to the upper panel
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submitPanel.setBackground(Color.lightGray);
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submit.setFont(submitButtonFont);
submit.addActionListener(this);
submitPanel.add(submit);
upperPanel.add(submitPanel);
//adding the question button text to the upper panel
JPanel questionText = new JPanel(new FlowLayout(FlowLayout.LEFT));
questionText.setBackground(Color.lightGray);
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label2.setFont(textButtonFont);
questionText.add(label2);
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label4.setFont(textButtonFont);
questionText.add(label4);
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label6.setFont(textButtonFont);
questionText.add(label6);
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label8.setFont(textButtonFont);
questionText.add(label8);
upperPanel.add(questionText);
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textGoTo.setBackground(Color.lightGray);
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upper10.setBackground(Color.lightGray);
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JLabel label10 = new JLabel("/25");
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upper10.add(goToText,BorderLayout.CENTER);
upper10.add(label10,BorderLayout.CENTER);
textGoTo.add(upper10);
upperPanel.add(textGoTo);
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spacePanel3.setBackground(Color.lightGray);
upperPanel.add(spacePanel3);
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timePanel.setBackground(Color.lightGray);
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upper20.setBackground(Color.lightGray);
upper20.add(timer.getTimeLabel(),BorderLayout.CENTER);
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upperPanel.add(timePanel);
//adding two more space panels
JPanel spacePanel4 = new JPanel();
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spacePanel4.setBackground(Color.lightGray);
spacePanel5.setBackground(Color.lightGray);
upperPanel.add(spacePanel4);
upperPanel.add(spacePanel5);
//adding the questions to the lower panel
JPanel lower1 = new JPanel(new GridLayout(4,1));
lower1.setBackground(Color.white);
JLabel question = new JLabel("<html>The parents of a 16-year-old swimmer contact an athletic trainer seeking nutritional advice for the athlete's pre-event<br><\bmeal. What recommendation should the athletic trainer share share with the parents regrading ideal pre-event meals?</html>");
question.setFont(new Font("Dialog", Font.PLAIN+Font.BOLD, 18));
JPanel answer = new JPanel(new GridLayout(6,1));
answer.setBackground(Color.white);
JLabel type = new JLabel("Choose all that apply.");
type.setFont(new Font("Dialog", Font.PLAIN+Font.BOLD+Font.ITALIC, 20));
JPanel answerA = new JPanel(new FlowLayout(FlowLayout.LEFT));
answerA.setBackground(Color.white);
JRadioButton a = new JRadioButton();
a.setBackground(Color.white);
a.setSize(25,25);
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aFill.setFont(font);
answerA.add(a);
answerA.add(aFill);
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answerB.setBackground(Color.white);
JRadioButton b = new JRadioButton();
b.setBackground(Color.white);
b.setSize(25,25);
JLabel bFill = new JLabel("Prepare meals without diuretics foods");
bFill.setFont(font);
answerB.add(b);
answerB.add(bFill);
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answerC.setBackground(Color.white);
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c.setBackground(Color.white);
c.setSize(25,25);
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cFill.setFont(font);
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answerC.add(cFill);
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answerD.setBackground(Color.white);
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d.setBackground(Color.white);
d.setSize(25,25);
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answerD.add(dFill);
JPanel record = new JPanel(new FlowLayout(FlowLayout.LEFT));
record.setBackground(Color.lightGray);
JLabel unanswered = new JLabel("Unanswered: ");
unanswered.setFont(font);
record.add(unanswered);
JLabel unansweredNumber = new JLabel("25");
unansweredNumber.setFont(font);
unansweredNumber.setForeground(Color.blue);
record.add(unansweredNumber);
JLabel space1 = new JLabel();
record.add(space1);
JLabel answered = new JLabel("Answered: ");
answered.setFont(font);
record.add(answered);
JLabel answeredNumber = new JLabel("0");
answeredNumber.setFont(font);
answeredNumber.setForeground(Color.blue);
record.add(answeredNumber);
JLabel space2 = new JLabel();
record.add(space2);
JLabel flagged = new JLabel("Flagged: ");
flagged.setFont(font);
record.add(flagged);
JLabel flaggedNumber = new JLabel("0");
flaggedNumber.setFont(font);
flaggedNumber.setForeground(Color.blue);
record.add(flaggedNumber);
answer.add(type);
answer.add(answerA);
answer.add(answerB);
answer.add(answerC);
answer.add(answerD);
answer.add(record);
lower1.add(question);
lower1.add(answer);
lowerPanel.add(lower1);
getContentPane().setBackground(Color.white);
upperPanel.setVisible(true);
lowerPanel.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == submit){
SubmitReview reviewScreen = new SubmitReview();
this.setVisible(false);
reviewScreen.setVisible(true);
}else if(e.getSource() == show){
if(timer.getTimeLabel().isVisible() == true){
timer.getTimeLabel().setVisible(false);
}else{
timer.getTimeLabel().setVisible(true);
}
}
}
}
FINAL SUBMIT
package edu.kings.pexam.student;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class SubmitReview extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JButton hideTimerButton;
private JButton showTimerButton;
private JComboBox<String> languageBox;
private JButton returnToQuizButton;
private JButton endQuizButton;
private JTextField textEnter;
static QuizTimer timer = TakeQuiz.timer;
/**
* Runs the program to produce the screen for submission review.
* #param args
*/
public static void main(String[] args){
SubmitReview window = new SubmitReview();
//sets the window visible
window.setVisible(true);
}
public SubmitReview(){
//Extends the screen to maximum size
setExtendedState(JFrame.MAXIMIZED_BOTH);
//Creates a panel that will keep items pushed to the right.
JPanel leftPanel = new JPanel();
leftPanel.setPreferredSize(new Dimension(200,HEIGHT));
leftPanel.setBackground(Color.white);
this.add(leftPanel,BorderLayout.WEST);
//Panel where everything on page will go.
JPanel rightPanel = new JPanel(new GridLayout(10,1));
rightPanel.setBackground(Color.white);
this.add(rightPanel, BorderLayout.CENTER);
//font for the text
Font textFont = new Font("Dialog",Font.PLAIN,15);
//First panel in the grid. Grid moves from top to bottom.
JPanel panel0 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
panel0.setBackground(Color.white);
//hide timer button, visible when timer is shown.
hideTimerButton = new JButton("Hide Timer");
hideTimerButton.setBackground(Color.lightGray);
Dimension hideTimerDimension = new Dimension(100,25);
hideTimerButton.setSize(hideTimerDimension);
hideTimerButton.setMinimumSize(hideTimerDimension);
hideTimerButton.setMaximumSize(hideTimerDimension);
hideTimerButton.setPreferredSize(hideTimerDimension);
hideTimerButton.setVisible(true);
//show timer button, visible when timer is not shown.
showTimerButton = new JButton("Show Timer");
showTimerButton.setBackground(Color.lightGray);
Dimension showTimerDimension = new Dimension(125, 25);
showTimerButton.setSize(showTimerDimension);
showTimerButton.setMinimumSize(showTimerDimension);
showTimerButton.setMaximumSize(showTimerDimension);
showTimerButton.setPreferredSize(showTimerDimension);
showTimerButton.setVisible(false);
//creates functionality for the show and hide timer buttons
hideTimerButton.addActionListener(this);
showTimerButton.addActionListener(this);
panel0.add(timer.getTimeLabel());
panel0.add(hideTimerButton);
panel0.add(showTimerButton);
rightPanel.add(panel0);
//Second panel in the grid.
JPanel panel1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel1.setBackground(Color.white);
//Splits this panel into a grid
JPanel grid = new JPanel(new GridLayout(2,1));
//A Panel to hold the language drop down menu
JPanel languagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
languagePanel.setBackground(Color.white);
//Creates a combo box of languages (drop down menu)
String[] languages = {"English", "Spanish", "French", "Portuguese" };
languageBox = new JComboBox<String>(languages);
languageBox.setBackground(Color.white);
languageBox.addActionListener(this);
languagePanel.add(languageBox);
//Text under the combo box
JPanel textPanel = new JPanel();
JLabel text = new JLabel("Do you want to end your exam now?");
Font font = new Font("Dialog",Font.PLAIN,17);
text.setFont(font);
textPanel.setBackground(Color.white);
textPanel.add(text);
grid.add(languagePanel);
grid.add(textPanel);
//Stop sign picture
File stopSign = new File("resources/stop_sign.png");
ImageIcon stopSignIcon = null;
try {
stopSignIcon = new ImageIcon(ImageIO.read(stopSign));
}
catch (IOException e) {
System.out.println("Caught exception:" + e);
}
JLabel stopLabel = new JLabel();
stopLabel.setIcon(stopSignIcon);
stopLabel.setBackground(Color.white);
stopLabel.setBorder(null);
panel1.add(grid);
panel1.add(stopLabel);
rightPanel.add(panel1);
//third panel in the grid
JPanel panel2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel2.setBackground(Color.white);
//splits the panel into a grid
JPanel textArea2 = new JPanel(new GridLayout(2,1));
textArea2.setBackground(Color.white);
JPanel warningText1 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
warningText1.setBackground(Color.white);
JLabel warningText1Point = new JLabel("<html><li>You left the following questions unanswered. If you end your exam now,<b> you lose the chance to answer these questions.</b></html>");
warningText1Point.setFont(textFont);
warningText1.add(warningText1Point);
JPanel breakPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
breakPanel.setBackground(Color.white);
JLabel space = new JLabel("<html><t> </t></html>");
breakPanel.add(space);
//adds FAKE question buttons to the panel
JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonPanel.setBackground(Color.white);
JButton one = new JButton("1");
JButton two = new JButton("5");
JButton three = new JButton("12");
one.setBackground(Color.lightGray);
two.setBackground(Color.lightGray);
three.setBackground(Color.lightGray);
buttonPanel.add(one);
buttonPanel.add(two);
buttonPanel.add(three);
breakPanel.add(buttonPanel);
textArea2.add(warningText1);
textArea2.add(breakPanel);
panel2.add(textArea2);
rightPanel.add(panel2);
//fourth panel in the grid
JPanel panel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel3.setBackground(Color.white);
JPanel textArea3 = new JPanel(new GridLayout(2,1));
textArea3.setBackground(Color.white);
JPanel warningText3 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
warningText3.setBackground(Color.white);
JLabel warningText3Point = new JLabel("<html><li>You marked the following questions for later review. If you end your exam now, <b>you lose the chance to review these marked questions.</b></html>");
textArea3.setBackground(Color.white);
warningText3Point.setFont(textFont);
JPanel breakPanel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
breakPanel3.setBackground(Color.white);
JLabel space3 = new JLabel("<html><t> </t></html>");
breakPanel3.add(space3);
JPanel buttonPanel3 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonPanel3.setBackground(Color.white);
JButton four = new JButton("4");
JButton five = new JButton("9");
JButton six = new JButton("20");
four.setBackground(Color.lightGray);
five.setBackground(Color.lightGray);
six.setBackground(Color.lightGray);
buttonPanel3.add(four);
buttonPanel3.add(five);
buttonPanel3.add(six);
breakPanel3.add(buttonPanel3);
textArea3.add(warningText3Point);
textArea3.add(warningText3);
textArea3.add(breakPanel3);
panel3.add(textArea3);
rightPanel.add(panel3);
//fifth panel in the grid
JPanel panel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel4.setBackground(Color.white);
JPanel grid4 = new JPanel(new GridLayout(2,1));
grid4.setBackground(Color.white);
JPanel border4 = new JPanel(new GridLayout(1,2));
border4.setBackground(Color.white);
JPanel spacer4 = new JPanel();
spacer4.setBackground(Color.white);
JPanel button4 = new JPanel();
button4.setBackground(Color.white);
returnToQuizButton = new JButton("No. Return to the Quiz" );
returnToQuizButton.setBackground(Color.lightGray);
returnToQuizButton.addActionListener(this);
button4.add(returnToQuizButton,BorderLayout.SOUTH);
JPanel textPanel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel4.setBackground(Color.white);
JLabel label4 = new JLabel("<html><li>You still have time remaining.</b></html>");
label4.setFont(textFont);
textPanel4.add(label4);
border4.add(spacer4);
border4.add(button4);
grid4.add(textPanel4);
grid4.add(border4);
panel4.add(grid4);
rightPanel.add(panel4);
//sixth panel in the grid
JPanel panel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel5.setBackground(Color.white);
JPanel textPanel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel5.setBackground(Color.white);
JLabel text5 = new JLabel("<html><li>If you end your exam now,<b> you cannot return to the exam.</b></html>");
text5.setFont(textFont);
textPanel5.add(text5);
panel5.add(textPanel5);
rightPanel.add(panel5);
//seventh panel in the grid
JPanel panel6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel6.setBackground(Color.white);
JPanel textPanel6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel6.setBackground(Color.white);
JLabel text6 = new JLabel("If you are ready to end the multiple-choice exam now, type the words 'I understand' in the box below.");
text6.setFont(textFont);
textPanel6.add(text6);
panel6.add(textPanel6);
rightPanel.add(panel6);
//eight panel in the grid
JPanel panel7 = new JPanel(new FlowLayout(FlowLayout.CENTER));
panel7.setBackground(Color.white);
textEnter = new JTextField("Type 'I understand' here.");
textEnter.setFont(textFont);
textEnter.setColumns(13);
//clears box on click of mouse
textEnter.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
textEnter.setText("");
}
});
textEnter.addActionListener(this);
JPanel textHolder = new JPanel();
textHolder.setBackground(Color.white);
textHolder.add(textEnter,BorderLayout.CENTER);
panel7.add(textHolder);
rightPanel.add(panel7);
//ninth panel in the grid
JPanel panel8 = new JPanel(new FlowLayout(FlowLayout.CENTER));
panel8.setBackground(Color.white);
endQuizButton = new JButton("Yes. End the Quiz Now");
endQuizButton.setBackground(Color.lightGray);
endQuizButton.addActionListener(this);
endQuizButton.setEnabled(false);
JPanel button8 = new JPanel();
button8.setBackground(Color.white);
button8.add(endQuizButton, BorderLayout.CENTER);
panel8.add(button8);
rightPanel.add(panel8);
getContentPane().setBackground(Color.white);
leftPanel.setVisible(true);
rightPanel.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
#Override
public void actionPerformed(ActionEvent e) {
String text = textEnter.getText();
if(text.equals("I understand")){
endQuizButton.setEnabled(true);
}
if(e.getSource() == hideTimerButton){
hideTimerButton.setVisible(false);
timer.getTimeLabel().setVisible(false);
showTimerButton.setVisible(true);
}else if(e.getSource() == showTimerButton){
showTimerButton.setVisible(false);
hideTimerButton.setVisible(true);
timer.getTimeLabel().setVisible(true);
}else if(e.getSource() == returnToQuizButton){
TakeQuiz quizScreen = new TakeQuiz();
this.setVisible(false);
quizScreen.setVisible(true);
}else if(e.getSource() == endQuizButton){
int response = JOptionPane.showConfirmDialog(null, "Are you sure you want to submit your quiz for grading?","Select an Option", JOptionPane.YES_NO_OPTION);
if(response == JOptionPane.YES_OPTION){
JOptionPane.showMessageDialog(null, "Your grade on this quiz is: 85");
System.exit(0);
}
}
}
}
QUIZ TIMER
package edu.kings.pexam.student;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.Timer;
public class QuizTimer {
private static double time = 1.44*Math.pow(10,7);
private SimpleDateFormat setTime = new SimpleDateFormat("hh:mm:ss");
private JLabel timeLabel;
private Timer countDown;
public QuizTimer(){
countDown = new Timer(1000, new ActionListener(){
public void actionPerformed(ActionEvent e) {
if (time >= 0) {
timeLabel.setText(setTime.format(time));
time = time-1000;
}else{
JOptionPane.showMessageDialog(null, "Your quiz has been automatically submitted for grading.", "Out of Time", JOptionPane.OK_OPTION);
System.exit(0);
}
}
});
timeLabel = new JLabel();
timeLabel.setFont( new Font("Dialog", Font.PLAIN + Font.BOLD,24));
timeLabel.setVisible(true);
}
public JLabel getTimeLabel(){
return timeLabel;
}
public void start(){
countDown.start();
}
}

The first problem (11:00:00 to 7:00:00) probably has to do with your timezone.
The second one may (from the top of my head) have to do with time field being static.
In any way, I'd be curious why it is static. Seems that this logic would break if you have two timers.
(P.S. Please vote.)

Java GUI (SWING/AWT) - Empty Frame - Components not showing

I'm trying to create (hand-coded) a GUI similair to the GUI shown below, however, only an empty frame shows.
Mock GUI:
I've used various layouts and SWING/AWT components to create the GUI and 4 JPanels which contain:
mainPanel: Contains all the panels in it.
listPanel: Contains the JTables, JLabels and the two JButtons
infoPanel: Contains the JLabels, JCheckBox and JTextBoxes.
addPanel: Contains the JLists and JButton
This is what I coded so far:
import java.awt.*;
import javax.swing.*;
import javax.swing.JTable;
public class GUI extends JFrame {
public void buildGui() {
JFrame frame = new JFrame("Hotel TV Scheduler");
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BorderLayout());
JPanel listPanel = new JPanel();
listPanel.setLayout(new GridLayout(3,3));
JPanel infoPanel = new JPanel();
infoPanel.setLayout(new GridLayout(2,2));
JPanel addPanel = new JPanel();
addPanel.setLayout(new FlowLayout());
mainPanel.add(listPanel, BorderLayout.LINE_START);
mainPanel.add(infoPanel, BorderLayout.LINE_END);
mainPanel.add(addPanel, BorderLayout.PAGE_END);
JTable chOneTable = new JTable();
JTable chTwoTable = new JTable();
JTable listTable = new JTable();
JLabel ch1Label = new JLabel("Channel 1");
JLabel ch2Label = new JLabel("Channel 2");
JLabel listLabel = new JLabel("List");
JButton rmvChOneButton = new JButton("Remove Channel");
JButton rmvChTwoButton = new JButton("Remove Channel");
listPanel.add(ch1Label);
listPanel.add(ch2Label);
listPanel.add(listLabel);
listPanel.add(chOneTable);
listPanel.add(chTwoTable);
listPanel.add(listTable);
listPanel.add(rmvChOneButton);
listPanel.add(rmvChTwoButton);
JLabel titleLabel = new JLabel("Title");
JLabel genreLabel = new JLabel("Genre");
JLabel durationLabel = new JLabel("Duration");
JLabel actorLabel = new JLabel("Actor");
JLabel directorLabel = new JLabel("Director");
JLabel rentableLabel = new JLabel("Rentable");
JLabel synLabel = new JLabel("Synopsis");
JTextField txtTitle = new JTextField();
JTextField txtGenre = new JTextField();
JTextField txtDuration = new JTextField();
JTextField txtActor = new JTextField();
JTextField txtDirector = new JTextField();
JTextField txtSynopsis = new JTextField();
JCheckBox rentCB = new JCheckBox();
infoPanel.add(titleLabel);
infoPanel.add(txtTitle);
infoPanel.add(genreLabel);
infoPanel.add(txtGenre);
infoPanel.add(durationLabel);
infoPanel.add(txtDuration);
infoPanel.add(actorLabel);
infoPanel.add(txtActor);
infoPanel.add(directorLabel);
infoPanel.add(txtDirector);
infoPanel.add(rentableLabel);
infoPanel.add(rentCB);
infoPanel.add(synLabel);
infoPanel.add(txtSynopsis);
JButton btnAddProg = new JButton("Add Program");
JList channelList = new JList();
JList timeList = new JList();
addPanel.add(btnAddProg);
addPanel.add(channelList);
addPanel.add(timeList);
frame.setVisible(true);
}
}
Anyone can tell me why only an empty frame is showing up ?
Thanks and Regards,
Brian

Yep just checked, you'll see something if you actually add the mainPanel to the frame, (looks nothing like the mock though!)
frame.setContentPane(mainPanel);
frame.pack();

You've not added mainPanel to the frame

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

3 Jpanel in JFrame, my button is not visible - java

The JPanelInformations in the constructor creates a local instance JPanel PanelInformation = new JPanel(); which is not added to main panel. You should either add it to this or get rid of it at all and add all the labels to this directly. The same with JPanelVentes

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