Develop Reference

Java Swing - JTable Not Showing in Scroll Pane

I created a class Cart and inside is a JTable and two ArrayLists. For some reason, my JTable is not displaying.
Here is my Cart Class:
class Cart {
ArrayList<Product> products = new ArrayList<>(); // Holds the products themselves
ArrayList<Integer> quantities = new ArrayList<>(); // Holds the quantities themselves
JTable prdTbl = new JTable(); // The GUI Product Table
DefaultTableModel prdTblModel = new DefaultTableModel(); // The Table Model
Object[] columns = {"Description","Price","Quantity","Total"}; // Column Identifiers
DecimalFormat fmt = new DecimalFormat("$#,##0.00;$-#,##0.00"); // Decimal Format for formatting USD ($#.##)
Cart() {
setTableStyle();
}
void renderTable() {
// Re-initialize the Table Model
this.prdTblModel = new DefaultTableModel();
// Set the Table Style
setTableStyle();
// Create a row from each list entry for product and quantity and add it to the Table Model
for(int i = 0; i < products.size(); i++) {
Object[] row = new Object[4];
row[0] = products.get(i).getName();
row[1] = products.get(i).getPrice();
row[2] = quantities.get(i);
row[3] = fmt.format(products.get(i).getPrice() * quantities.get(i));
this.prdTblModel.addRow(row);
}
this.prdTbl.setModel(this.prdTblModel);
}
void setTableStyle() {
this.prdTblModel.setColumnIdentifiers(columns);
this.prdTbl.setModel(this.prdTblModel);
this.prdTbl.setBackground(Color.white);
this.prdTbl.setForeground(Color.black);
Font font = new Font("Tahoma",1,22);
this.prdTbl.setFont(font);
this.prdTbl.setRowHeight(30);
}
JTable getTable() {
renderTable(); // Render Table
return this.prdTbl;
}
}
Note: some methods have been removed such as addProduct() and removeProduct(), as I feel they aren't necessary. If you need to see them, please ask.
Here is my initialize() method for the Swing Application Window:
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 590, 425);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Cart cart = new Cart();
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
frame.getContentPane().add(tabbedPane, "cell 0 0,grow");
JPanel cartPanel = new JPanel();
tabbedPane.addTab("Cart", null, cartPanel, null);
cartPanel.setLayout(new MigLayout("", "[grow]", "[][grow]"));
JScrollPane scrollPane = new JScrollPane();
cartPanel.add(scrollPane, "cell 0 1,grow");
table = new JTable();
scrollPane.setViewportView(table);
JButton btnAdd = new JButton("Add");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String[] item = {"Macadamia", "Hazelnut", "Almond", "Peanut", "Walnut", "Pistachio", "Pecan", "Brazil"};
Double[] price = {2.00, 1.90, 1.31, 0.85, 1.12, 1.53, 1.25, 1.75};
int choice = (int) (Math.random() * item.length);
Product p = new Product(item[choice], price[choice]);
cart.addProduct(p);
table = cart.getTable();
}
});
cartPanel.add(btnAdd, "flowx,cell 0 0");
JButton btnRemove = new JButton("Remove");
cartPanel.add(btnRemove, "cell 0 0");
JButton btnClear = new JButton("Clear");
cartPanel.add(btnClear, "cell 0 0");
}
I'm not sure if I'm missing something here? It has worked fine like this in the past? I've also tried printing out values at table = cart.getTable();, and it seems to be receiving the values fine, so it leads me to believe it has something to do with the Swing initialize() rather than my Cart class, but just in case I posted the Cart class as well.

Are you sure you're adding the right table? Your code shows:
table = new JTable();
scrollPane.setViewportView(table);
I cannot see where's table declared, further more table contains nothing, no rows no columns, while inside actionListener you initialize table with a new instance:
table = cart.getTable();
but the scrollPane holds another instance of JTable.

It looks like you never associate your cart with your cartPanel; I think your problem is here:
JPanel cartPanel = new JPanel();
you make the new panel but never hook your cart to it. Looks good otherwise.
Good luck!

Calling specific methods between classes

Help! I dont know much about java but im trying to create a small program where people can buy items and the stock should update depending on their purchase. I have 2 different classes but what im trying to do is that i want to get the amount of items the user purchases from one class and use that number to update the stock in another class - Here is the section of my code in which i am struggling with
Code for Purchasing Item
public class PurchaseItem extends JFrame implements ActionListener {
JTextField ItemNo = new JTextField(5); //Adds a text field named ItemNo
JTextField AmountNo = new JTextField(5); //Adds a text field named AmountNo
TextArea information = new TextArea(6, 40); //Adds a text area named Information
TextArea reciept = new TextArea (10,50); //Adds a text area named Reciept
JButton Check = new JButton("Check"); //Adds a button named Check
JButton Buy = new JButton("Buy"); //Adds a button named Buy
DecimalFormat pounds = new DecimalFormat("£#,##0.00"); //For output to display in decimal and pounds format
public PurchaseItem() { //PurchaseItem class
this.setLayout(new BorderLayout()); //Adds a new layout for PurchaseItem
JPanel top = new JPanel(); //JPanel is a a container for other components
top.setLayout(new FlowLayout(FlowLayout.CENTER)); //It is set to the center of the frame
JPanel bottom = new JPanel(); //JPanel is a a container for other components
bottom.setLayout(new FlowLayout(FlowLayout.CENTER)); //It is set to the center of the frame
bottom.add(Buy); //Insert the "Buy" JButton on the frame
this.add(bottom, BorderLayout.SOUTH); //Button goes at the bottom of the frame
setBounds(100, 100, 450, 250); //Sets the bounds of the frame
setTitle("Purchase Item"); //Sets the title of the frame
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //Default option to exit frame is through button and not X sign
top.add(new JLabel("Enter Item Key:")); //Add a new JLabel at the top of the frame
top.add(ItemNo); //Set the ItemNo Text Field at the top of the frame
top.add(new JLabel ("Enter Amount:")); //Add a new JLabel at the top of the frame
top.add(AmountNo); //Set the AmountNo Text Field at the top of the frame
top.add(Check); //Set the Check Button at the top of the frame
Buy.setText("Buy"); Buy.setVisible(true); //Makes the text of the Buy Button visible
Check.addActionListener(this); //Add an ActionListener to the Check Button
Buy.addActionListener(this); //Add an ActionListener to the Buy Button
add("North", top);
JPanel middle = new JPanel(); //JPanel is a a container for other components
middle.add(information); //Set the Information Text Area at the middle of the frame
add("Center", middle);
setResizable(false); //Makes the frame not resizeable
setVisible(true); //Makes the frame visible
}
#Override //Overrides the method of the PurchaseItem class to identify mistakes and typos
public void actionPerformed(ActionEvent e) { //actionPerformed class. This is called when the actionListener event happens
String ItemKey = ItemNo.getText(); //String for getting the user input from the ItemNo Text Field
String ItemAmount = AmountNo.getText(); //String for getting the user input from the AmountNo Text Field
String Name = StockData.getName(ItemKey); //String for getting the name of the item from StockData
int Amount = Integer.parseInt(ItemAmount); //Convert String ItemAmount into an Integer variable named Amount
int NewStock = StockData.getQuantity(ItemKey) - Amount; //Integer named NewStock. NewStock is the current stock(from StockData) minus the Amount
double Total = Amount * StockData.getPrice(ItemKey); //Double named Total. Total is the Amount multiplied by the price of the item(from StockData)
Calendar cal = Calendar.getInstance(); //Calendar named cal. getInstance is used to get the current time
SimpleDateFormat Date = new SimpleDateFormat("dd/MM/yyyy"); //SimpleDateFormat named Date. It is used to display the date
SimpleDateFormat Time = new SimpleDateFormat("HH:mm:ss"); //SimpleDateFormat named Time. It is used to display the time
if (Name == null){ //If the Name is invalid and has no return value
information.setText("There is no such item"); //Display the message on the Information Text Area
}
else if (Amount > StockData.getQuantity(ItemKey)) { //Else if the Amount(User Input) is more than the quantity of the item(from StockData)
information.setText("Sorry there is not enough stock available"); //Display the message on the Information Text Area
}
else { //Otherwise
information.setText(Name + " selected: " + Amount); //Add the Name and the Amount of the item on the Information Text Area
information.append("\nIndividual Unit Price: " + pounds.format(StockData.getPrice(ItemKey))); //On a new line add the individual price of the item on the Information Text Area in a pound format(£)
information.append("\nCurrent Stock Available: " + StockData.getQuantity(ItemKey)); //On a new line add the current quantity available according to StockData on the Information Text Area
information.append("\nNew Stock After Sale: " + NewStock); //On a new line add the NewStock on the Information Text Area
information.append("\n\nTotal: " + Amount + " Units" + " at " + pounds.format(StockData.getPrice(ItemKey)) + " each"); //On two new lines add the Amount plus the item price(from StockData). This becomes the Total
information.append("\n= " + pounds.format(Total)); //On a new line display the Total in a pounds format(£) on the Information Text Area
}
if (e.getSource() == Buy) { //If the user clicks the Buy Button
int response = JOptionPane.showConfirmDialog(null, "Buy " + Amount + " Units" + " for " + pounds.format(Total) + "?"); //Show a confirm dialog asking the user to confirm the purchase with a Yes, No, or Cancel option
if (response == JOptionPane.YES_OPTION) { //If the user clicks Yes on the confirm dialog
JFrame frame2 = new JFrame(); //Add a new JFrame called frame2
TextArea Reciept = new TextArea ("Receipt For Your Purchase", 20,40); //Add the Receipt Text Area onto frame2 and show the message
Reciept.append("\n\nTime: " + Time.format(cal.getTime())); Reciept.append("\nDate: " + Date.format(cal.getTime())); //On seperate lines add the Time and the Date (from Calendar)
Reciept.append("\n\nYou Have Purchased The Following Item(s): "); //Display the message
Reciept.append("\n\n" + Name + "\n" + Amount + " Units" + "\n" + pounds.format(StockData.getPrice(ItemKey)) + " each"); //On a line add the Name and Item Amount followed by the item price (from StockData) on a new line
Reciept.append("\n\n\n" + Amount + " Unit(s)" + " at " + pounds.format(StockData.getPrice(ItemKey)) + " each" + "\nTotal = " + pounds.format(Total)); //After 3 lines display the Item Amount and the item price on the same line. On a new line display the Total in a pounds format
Reciept.append("\n\n\nThank You For Your Purchase" + "\n\nGoodbye :)"); //Show a message on two seperate lines
frame2.pack(); frame2.setSize(375, 380); frame2.setLocation(250, 250); ;frame2.setTitle("Receipt"); //Sets the size, the location, and the title of frame2
frame2.setVisible(true); frame2.setResizable(false); //sets frame2 so that it is visible and not resizable
frame2.add(Reciept); //Display the Reciept Text Area on frame2
frame2.setLayout(new FlowLayout(FlowLayout.CENTER)); //It is set to the center of the frame
}else{ //Otherwise
if (response == JOptionPane.NO_OPTION){ //If the user clicks No or Cancel on the confirm dialog
//Do nothing
}
}
Code for Checking Stock
public class CheckStock extends JFrame implements ActionListener {
JTextField stockNo = new JTextField(7); //adds a text field for user input
JTextField AmountNo = new JTextField(5);
TextArea information = new TextArea(6, 40); //adds a text area for the output
JButton check = new JButton("Check Stock"); //adds a button with the text "Check Stock"
JButton Clear = new JButton();
DecimalFormat pounds = new DecimalFormat("£#,##0.00"); //for output to display in decimal and pound format
public CheckStock() { //"CheckStock" class
setLayout(new BorderLayout()); //adds a new frame for "CheckStock"
setBounds(100, 100, 450, 220); //sets the size and location of the frame
setTitle("Check Stock"); //sets the title of the frame
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //user has to click on "Exit" button instead of X sign
check.addActionListener(this); //adds an action listener for the "check" button so when clicked by user, "actionPerformed" class is called
JPanel top = new JPanel(); //JPanel is a a container for other components. It is used at the top of the frame
add("North", top);
top.add(new JLabel("Enter Item Key:")); //adds a label at the top of tne frame
top.add(stockNo); //adds the "stockNo" text field to the top of the frame
top.add(check); //adds the "check" button to the top of the frame
JPanel middle = new JPanel(); //JPanel is a a container for other components. It is used at the middle of the frame
add("Center", middle);
middle.add(information); //in the middle of the frame, add the "information" text area
setResizable(false); //frame is not resizable
setVisible(true); //frame is visible
}
public void actionPerformed(ActionEvent e) { //this code is fired once the user runs the ActionListener
String key = stockNo.getText(); //string named "key" for the stockNo
String name = StockData.getName(key); //string named "name" for the stockData
int Quantity = StockData.getQuantity(key);
int NewStock;
if (name == null) { //if there is no input in the text field
information.setText("Enter Item Key"); //display the message on the text area
}
else if (e.getSource() == check) {
StockData.getQuantity(key);
information.append( "" + StockData.getName(key));
information.append("\n New Stock: " + StockData.getQuantity(key)); //otherwise
information.setText(name); //display the name of the item
information.append("\nPrice: " + pounds.format(StockData.getPrice(key))); //display the price of the item using pound format
information.append("\nPrevious Stock: " + Quantity); //display the amount in stock for the item according to StockData
}
}
}

You didn't initialise the object Update: your line of code should be
PurchaseItem Update = new PurchaseItem();
(As another point I can't see any code that adds the JComponent you created (e.g. the buttons, the text fields,...) to the two frames of the respective classes or that displays the two frames; if it isn't included in your code be sure to add these pieces of code).
Finally, if you need a code that checks for changes in the value of Updated, here's the simplest (but not the only) technique you can use, creating a thread (see the Oracle documentation to know what are threads and how to use them):
int refreshTime = 1000; // Refresh time in milliseconds
boolean running = true; // Set it to false if you want to stop the thread
Runnable r = new Runnable({
#Override
public void run() {
while(running) {
Thread.sleep(refreshTime);
// Put here your code to update your frames or your variables
}
});

Add a JScrollPane to avoid distortion of components

I am trying to make a variable size interface. However, currently, if the size of all components is greater than the dimension of the window, then those begin to
distort ! Therefore, I would like to add a JScrollPane to be displayed when the window size is no longer sufficient, in order to avoid this distortion.
I just started by adding a JScrollPane (as shown on the code bellow), but it does not seem to work, and I am not sure what to change now.
JScrollPane myScrollPane = new JScrollPane();
myWindow.getContentPane().add(myScrollPane, BorderLayout.CENTER);
EDIT 1: here is a simple example of what I have tried:
static void one(String[] ari, JLabel sess_nb, Box boxy, long[] res){
int p;
int length = ari.length;
Border cadre = BorderFactory.createLineBorder(Color.black);
Font police = new Font("Monospaced 13", Font.BOLD, 18);
Font police1 = new Font("Monospaced 13", Font.BOLD, 15);
Font font = new Font("Monospaced 13", Font.ITALIC, 13);
for (p=0;p<length;p++){
Box boxz = Box.createVerticalBox();
JLabel Rate = new JLabel("Rating Group "+r);
JLabel rg_reser = new JLabel();
JLabel switsh = new JLabel("1");
JLabel reser = new JLabel(); //in this label the resrvation for each update and each rating group will be stocked
JLabel consump = new JLabel(); //in this label will be stocked the consumption
//----------------------------------------------------
//choice of MB or kB
JComboBox combo = new JComboBox();
combo.addItem("Megabytes");
combo.addItem("Bytes");
combo.addItem("kilobytes");
combo.addItem("Gigabytes");
JLabel upload = new JLabel("Upload consumption:");
JTextField upload_entry = new JTextField("7.5");
JLabel download = new JLabel("Download consumption:");
JTextField download_entry = new JTextField("7.5");
JTextField total_entry = new JTextField();
JLabel total = new JLabel("Total consumption:");
JButton rg = new JButton("Next");
JLabel update = new JLabel("Result here");
boxz.add(Rate);
boxz.add(total);
boxz.add(total_entry);
boxz.add(upload);
boxz.add(upload_entry);
boxz.add(download);
boxz.add(download_entry);
boxz.add(combo);
boxz.add(rg);
boxz.add(update);
boxy.add(boxz);
scrollPane1.add(boxy);
}
EDIT 2: here is a new test code, but it also does not work:
public Fenetre(){
this.setTitle("Data Simulator");
this.setSize(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
String hello = "hello";
int number = 69;
JPanel content = new JPanel();
content.setBackground(Color.LIGHT_GRAY);
//Box imad = Box.createHorizontalBox();
JTextArea textArea = new JTextArea(10, 10);
JLabel imad = new JLabel();
imad.setText(hello + " your favorite number is " + number + "\nRight?");
JScrollPane scrollPane = new JScrollPane();
setPreferredSize(new Dimension(450, 110));
scrollPane.setHorizontalScrollBarPolicy(HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setVerticalScrollBarPolicy(VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setEnabled(true);
scrollPane.setWheelScrollingEnabled(true);
scrollPane.setViewportView(textArea);
scrollPane.setViewportView(imad);
add(scrollPane, BorderLayout.CENTER);
//---------------------------------------------
//On ajoute le conteneur
content.add(imad);
content.add(textArea);
content.add(scrollPane);
this.setContentPane(content);
this.setVisible(true);
this.setResizable(false);
}
A small white scare appears (I think it is the scroll bar or scroll panel?) and the components in the window exceeds the windows size but nothing happens when I try to scroll (using the mouse or by clinking on the white scare). I don't know what is wrong.

Don't use scrollPanel.add(boxy) - you need to add boxy to the scrollPanel's viewport, not to the scrollPanel itself. Use scrollPanel.setViewportView(boxy) instead, or better yet create the ScrollPanel AFTER you create boxy and use the constructor that takes a Component argument.

Writing actionListner to display form input on console upon confirmation

I am currently constructing a GUI which allows me to add new cruises to the system. I want to write an actionListner which once the user clicks on "ok" then the form input will be displayed as output on the console.
I currently have the following draft to complete this task:
ok = new JButton("Add Cruise");
ok.setToolTipText("To add the Cruise to the system");
ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event){
int selected = typeList2.getSelectedIndex();
String tText = typeList2[selected];
Boolean addtheCruise = false;
addtheCruise = fleet.addCruise();
fleet.printCruise();
if (addtheCruise)
{
frame.setVisible(false);
}
else
{ // Report error, and allow form to be re-used
JOptionPane.showMessageDialog(frame,
"That Cruise already exists!", "Error",
JOptionPane.ERROR_MESSAGE);
}
}
});
buttonPanel.add(ok);
Here is the rest of the code to the Form input frame:
contentPane2 = new JPanel (new GridLayout(18, 1)); //row, col
nameInput = new JLabel ("Input Cruise Name:");
nameInput.setForeground(normalText);
contentPane2.add(nameInput);
Frame2.add(contentPane2);
Cruisename = new JTextField("",10);
contentPane2.add(Cruisename);
Frame2.add(contentPane2, BorderLayout.CENTER);
Frame2.setVisible(true);
confirmPanel = new JPanel ();
confirmPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
confirmPanel.setBorder(BorderFactory.createLineBorder(Color.PINK));
addItinerary = new JButton("Add Itinerary");
confirmPanel.add(Add);
confirmPanel.add(addItinerary );
Frame2.add(confirmPanel, BorderLayout.PAGE_END);
Frame2.setVisible(true);
contentPane2.add(Cruisename);
Frame2.add(contentPane2);
// add spacing between comboboxes
contentPane2.add(Box.createRigidArea(new Dimension(5,0)));
contentPane2.setBorder(BorderFactory.createLineBorder(Color.black));
//Label for start and end location jcombobox
CruiseMessage = new JLabel ("Enter Start and End Location of new Cruise:");
CruiseMessage.setForeground(normalText);
contentPane2.add(CruiseMessage);
Frame2.add(contentPane2);
/**
* creating start location JComboBox
*/
startL = new JComboBox();
final JComboBox typeList2;
final String[] typeStrings2 = {
"Select Start Location", "Tobermory","Oban", "Isle of Mull", "Isle of Harris",
"Lewis and Harris", "Stornoway", "Skye", "Portree"};
startL = new JComboBox(typeStrings2);
contentPane2.add(startL);
Frame2.add(contentPane2, BorderLayout.CENTER);
Frame2.setVisible(true);
// add spacing between comboboxes
contentPane2.add(Box.createRigidArea(new Dimension(5,0)));
/**
* creating end location JComboBox
*/
endL = new JComboBox();
final JComboBox typeList3;
final String[] typeStrings3 = {
"Select End Location", "Tobermory","Oban", "Isle of Mull", "Isle of Harris",
"Lewis and Harris", "Stornoway", "Skye", "Portree"};
endL = new JComboBox(typeStrings3);
contentPane2.add(endL);
Frame2.add(contentPane2, BorderLayout.CENTER);
Frame2.setVisible(true);
// add spacing between comboboxes
contentPane2.add(Box.createRigidArea(new Dimension(5,0)));
//Label for select ship jcombobox
selectShipM = new JLabel ("Select Ship to assign Cruise:");
selectShipM.setForeground(normalText);
contentPane2.add(selectShipM);
Frame2.add(contentPane2);
/**
* creating select ship JCombobox
* select ship to assign cruise
*/
selectShip = new JComboBox();
final JComboBox typeList4;
final String[] typeStrings4 = {
"Select Ship", "Dalton Princess", "Stafford Princess" };
selectShip = new JComboBox(typeStrings4);
contentPane2.add(selectShip);
Frame2.add(contentPane2, BorderLayout.CENTER);
Frame2.setVisible(true);
I need all form inputs from the code above to be displayed on the console upon completion.
Summary:
1. I have two ships in one fleet
2. To add new cruise, all fields (Name, start date, end date, ship) must be selected.
The Problem:
1. I keep coming up with errors when creating " fleet = new Fleet();" in my constructor. Even though I have declared it in my class.
2. In the draft code below, line 5 states "typeList2", however, I have two JComboBox's - two different type Strings for both drop down menu's (Shown in the rest of the code). How do I input both typeLists to the output rather than just one?
Thank you.

Recording user choice java

I have a scroll box where a user can choose between options. If I want the user's choice to print elsewhere, what will I need to call? I already have where I want the user choice.
results.setText();
What would go in the parenthesis?
import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
import java.awt.event.*;
public class container implements ActionListener
{
JPanel panels;
Timer timer;
JTextField userTypingRegion;
JTextArea results;
JComboBox<Integer> ageEntries;
JComboBox<String> raceList;
public void init(Container pane)
{
JButton switcher = new JButton("Next / Back");
switcher.addActionListener(this);
JPanel infoPage = new JPanel();
infoPage.setBackground(Color.BLACK);
//CENTER
JPanel panelCenter = new JPanel();
panelCenter.setBackground(Color.GRAY);
panelCenter.setLayout(new BoxLayout(panelCenter, BoxLayout.Y_AXIS));
infoPage.add(BorderLayout.CENTER, panelCenter);
///Gender
JPanel genderSelection = new JPanel();
JLabel gender = new JLabel("Gender:");
JCheckBox checkGenderMale = new JCheckBox("Male");
JCheckBox checkGenderFemale = new JCheckBox("Female");
genderSelection.add(gender);
genderSelection.add(checkGenderMale);
genderSelection.add(checkGenderFemale);
panelCenter.add(genderSelection);
///Age
JPanel ageSelection = new JPanel();
JLabel age = new JLabel("Age:");
ArrayList<Integer> ageList = new ArrayList<Integer> ();
for (int i = 1; i <= 100; ++i)
{
ageList.add(i);
}
DefaultComboBoxModel<Integer> modelAge = new DefaultComboBoxModel<Integer>();
for (Integer i : ageList)
{
modelAge.addElement(i);
}
JComboBox<Integer> ageEntries = new JComboBox<Integer>();
ageEntries.setModel(modelAge);
ageSelection.add(age);
ageSelection.add(ageEntries);
panelCenter.add(ageSelection);
///Race
JPanel raceSelection = new JPanel();
JLabel race = new JLabel("Race/Ethnicity:");
String[] raceEntries = {"White", "Black", "Hispanic"
, "Asian/Pacific Islander"
, "Alaska Native/American Indian", "Confused"};
JComboBox<String> raceList = new JComboBox<String>(raceEntries);
raceList.addActionListener(new transferInfo());
raceSelection.add(race);
raceSelection.add(raceList);
panelCenter.add(raceSelection);
///Question 1
JPanel firstQuestion = new JPanel();
JLabel one = new JLabel("How often do you read?");
String[] oneEntries = {"Always", "Often", "Sometimes"
, "Not Often", "What is reading?"};
JComboBox<String> oneAnswer = new JComboBox<String>(oneEntries);
firstQuestion.add(one);
firstQuestion.add(oneAnswer);
panelCenter.add(firstQuestion);
///Question 2
JPanel secondQuestion = new JPanel();
JLabel two = new JLabel("Average time (in minutes) " +
"spent on the computer per day:");
ArrayList<Integer> hourList = new ArrayList<Integer>();
for (int z = 0; z <= 1440; z = z + 30)
{
hourList.add(z);
}
DefaultComboBoxModel<Integer> modelHour = new DefaultComboBoxModel<Integer>();
for (Integer z : hourList)
{
modelHour.addElement(z);
}
JComboBox<Integer> hourEntries = new JComboBox<Integer>();
hourEntries.setModel(modelHour);
secondQuestion.add(two);
secondQuestion.add(hourEntries);
panelCenter.add(secondQuestion);
///Question 3
JPanel thirdQuestion = new JPanel();
JLabel three = new JLabel("Favorite Subject");
String[] threeEntries = {"English", "Math", "Science"
, "Foreign Languages", "History", "Hate them all"};
JComboBox<String> threeAnswer = new JComboBox<String>(threeEntries);
thirdQuestion.add(three);
thirdQuestion.add(threeAnswer);
panelCenter.add(thirdQuestion);
///Question 4
JPanel fourthQuestion = new JPanel();
JLabel four = new JLabel("Average sleep (in minutes) per night:");
ArrayList<Integer> sleepTimeList = new ArrayList<Integer>();
for (int y = 0; y <= 1440; y = y + 30)
{
sleepTimeList.add(y);
}
DefaultComboBoxModel<Integer> modelSleepTime = new DefaultComboBoxModel<Integer>();
for (Integer z : sleepTimeList)
{
modelSleepTime.addElement(z);
}
JComboBox<Integer> sleepTimeEntries = new JComboBox<Integer>();
sleepTimeEntries.setModel(modelSleepTime);
fourthQuestion.add(four);
fourthQuestion.add(sleepTimeEntries);
panelCenter.add(fourthQuestion);
///Question 5
JPanel fifthQuestion = new JPanel();
JLabel five = new JLabel("I am...");
String [] fiveEntries = {"Outgoing", "In the middle", "Shy"};
JComboBox<String> fiveAnswer = new JComboBox<String>(fiveEntries);
fifthQuestion.add(five);
fifthQuestion.add(fiveAnswer);
panelCenter.add(fifthQuestion);
///Question 6
JPanel sixthQuestion = new JPanel();
JLabel six = new JLabel("I am...");
String [] sixEntries = {"Adventurous", "In the middle", "Lazy"};
JComboBox<String> sixAnswer = new JComboBox<String>(sixEntries);
sixthQuestion.add(six);
sixthQuestion.add(sixAnswer);
panelCenter.add(sixthQuestion);
///Question 7
JPanel seventhQuestion = new JPanel();
JLabel seven = new JLabel("I live in the...");
String [] sevenEntries = {"City", "Suburb", "Country", "Narnia"};
JComboBox<String> sevenAnswer = new JComboBox<String>(sevenEntries);
seventhQuestion.add(seven);
seventhQuestion.add(sevenAnswer);
panelCenter.add(seventhQuestion);
///Question 8
JPanel eighthQuestion = new JPanel();
JLabel eight = new JLabel("Please choose the painting you like.");
eighthQuestion.add(eight);
panelCenter.add(eighthQuestion);
///Adding Picture
JPanel pictures = new JPanel();
ImageIcon image = new ImageIcon("C:\\Users\\Kevin\\Desktop\\Left and Right.jpg");
JLabel imageButton = new JLabel();
imageButton.setIcon(image);
pictures.add(imageButton);
panelCenter.add(pictures);
///Question 9
JPanel ninthQuestion = new JPanel();
JCheckBox checkLeft = new JCheckBox("I like the left one!");
JCheckBox checkRight = new JCheckBox("I like the right one!");
ninthQuestion.add(checkLeft);
ninthQuestion.add(checkRight);
panelCenter.add(ninthQuestion);
////Second Card
JPanel programFrame = new JPanel();
programFrame.setBackground(Color.BLACK);
programFrame.setMinimumSize(new Dimension(200, 300));
programFrame.setMaximumSize(new Dimension(800, 700));
programFrame.setPreferredSize(new Dimension(500, 500));
///CENTER DATA COLLECTION REGION
JPanel dataCollectionRegion = new JPanel();
dataCollectionRegion.setBackground(Color.LIGHT_GRAY);
dataCollectionRegion.setLayout(
new BoxLayout(dataCollectionRegion, BoxLayout.Y_AXIS));
programFrame.add(BorderLayout.CENTER, dataCollectionRegion);
///South Region
JPanel southRegion = new JPanel();
southRegion.setBackground(Color.BLACK);
southRegion.setLayout(new BoxLayout(southRegion, BoxLayout.Y_AXIS));
programFrame.add(BorderLayout.NORTH, southRegion);
///Data Components
JLabel sampleWriting = new JLabel("<html>7 Dear friends, let us love one another, for love comes from God. <br>Everyone who loves has been born of God and knows God. 8 Whoever <br>does not love does not know God, because God is love. 9 This is how <br>God showed his love among us: He sent his one and only Son into <br>the world that we might live through him. 10 This is love: not that we <br>loved God, but that he loved us and sent his Son as an atoning sacrifice <br> for our sins. 11 Dear friends, since God so loved us, we also ought <br>to love one another. 12 No one has ever seen God; but if we love one <br> another, God lives in us and his love is made complete in us. <br> 1 Everyone who believes that Jesus is the Christ is born of God, and everyone <br> who loves the father loves his child as well. 2 This is how we know <br> that we love the children of God: by loving God and carrying out his commands. <br> 3 In fact, this is love for God: to keep his commands. And his commands <br> are not burdensome, 4 for everyone born of God overcomes the world. <br> This is the victory that has overcome the world, even our faith. 5 Who <br> is it that overcomes the world? Only the one who believes that Jesus is the Son of God.</html>");
userTypingRegion = new JTextField();
userTypingRegion.addActionListener( this);
dataCollectionRegion.add(sampleWriting);
dataCollectionRegion.add(userTypingRegion);
///Instructions South
JLabel instructions = new JLabel("Instruction: Type the " +
"passage as fast as possible in the space provided.");
instructions.setForeground(Color.white);
JLabel showResult = new JLabel("- - - Results - - -");
showResult.setForeground(Color.white);
showResult.setHorizontalTextPosition(JLabel.CENTER);
results = new JTextArea();
results.setEditable(false);
southRegion.add(instructions);
southRegion.add(Box.createRigidArea(new Dimension(0,5)));
southRegion.add(showResult);
southRegion.add(Box.createRigidArea(new Dimension(0,5)));
southRegion.add(results);
///add cards
panels = new JPanel(new CardLayout());
panels.add(infoPage);
panels.add(programFrame);
pane.add(switcher, BorderLayout.PAGE_START);
pane.add(panels, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent evt)
{
CardLayout layout = (CardLayout)(panels.getLayout());
layout.next(panels);
}
class transferInfo implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
results.setText("Selected: " + raceList.getSelectedItem());
}
}
public static void main(String[] args)
{
JFrame frame = new JFrame("Biometric Keystroke Dynamics");
container TabChanger = new container();
TabChanger.init(frame.getContentPane());
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
}
}
You can see my attempt at resolving this issue near the end of the code. I apologize in advance for my messy coding. (it is my first)

First of all the mistakes you are committing in your code :
You are declaring JComboBox<Integer> ageEntries; and JComboBox<String> raceList; as your instance variables and as your localvariables inside your init(...) method. Don't declare them twice, use only the instance variables or the local variables, as the need be, but do not use them twice.
Always make this a habit of yours to add this ilne frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); as you make an object of JFrame, this helps in shutting down the JFrame window in a good manner.
Now for what to write in results.setText(); . You can make one validation method inside your container class, which will return boolean and will be called inside the actionPerformed(...) method of the NextButton and inside this method check the values as entered by the user as legitimate or not, if they are legal values then use StringBuilder to append it like say
StringBuilder sb = new StringBuilder(); // this will be your instance variable not local.
sb.append((String) ageEntries.getSelectedItem());
sb.append(" "); // Add this space to distinguish between two values.
// and so on for other values.
Once done you can write results.setText(containerObject.sb.toString()); to show these values.