Correct handling of objects extended from FX classes

Quick simple question. If I write a class that's extended from one of JavaFX's classes, do I need to make state changes that weren't part of the original class on the FX Application thread? In my case, I'm creating a signal class that's basically a Path, but it has some other information that is set by other threads, like the next value that will be added to the path. Obviously, I need to actually do the adding of that value to the Path on the FX Application thread. But if my Signal is extended from path, and I have a nextValue field, and a receiveValue method, would it be safe for me to call receiveValue on another thread? The co-ordinate to add to the path would later be created from that value, on the FX Application thread. Thanks!
-cullam

You can call your own methods from any thread you like. As soon as you interact with properties that would change the Scene however you will have to be on the FX thread.
I extend the JavaFX containers all the time in my project and I'm very happy with how that works out.

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How do i use objects from one class in anohter?

Hey
I have two GUI classes ShowWhiteGUI and BasketGUI and then a control class ShowWhite. The control class calls all the method from anohter class's which the GUI classes are gonna use.
The basis idea with this script is it shall be a very very simpel Shop. Where you can add items to a basket and then show the items in a new window(BasketGUI).
So here is the problem. I cant create an object in both GUI classes, because then im working with two sets of data, right? So how do i do this?
Here is my code:
ShowWhiteGUI
* ShowWhiteGUI.java
* Created on 5. februar 2008, 10:43
package userclasses;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
* @author Lille mus
public class ShowWhiteGUI extends javax.swing.JFrame {
    private BasketGUI basketGUI;
    private ShowWhite control;
    /** Creates new form ShowWhiteGUI */
    public ShowWhiteGUI() {
        basketGUI = new BasketGUI();
        control = new ShowWhite();
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        aboutDialog = new javax.swing.JDialog();
        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        itemIdField = new javax.swing.JTextField();
        productIdLabel = new javax.swing.JLabel();
        numberOfItems = new javax.swing.JLabel();
        productId = new javax.swing.JTextField();
        basketButton = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        showBasketButton = new javax.swing.JButton();
        jMenuBar1 = new javax.swing.JMenuBar();
        menu = new javax.swing.JMenu();
        jMenu1 = new javax.swing.JMenu();
        open = new javax.swing.JMenuItem();
        quit = new javax.swing.JMenuItem();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();
        help = new javax.swing.JMenuItem();
        about = new javax.swing.JMenuItem();
        javax.swing.GroupLayout aboutDialogLayout = new javax.swing.GroupLayout(aboutDialog.getContentPane());
        aboutDialog.getContentPane().setLayout(aboutDialogLayout);
        aboutDialogLayout.setHorizontalGroup(
            aboutDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        aboutDialogLayout.setVerticalGroup(
            aboutDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Show White's Shop");
        setBackground(new java.awt.Color(0, 102, 255));
        jLabel1.setFont(new java.awt.Font("Baby Kruffy", 0, 36));
        jLabel1.setText("Snow White?s Shop");
        jTextArea1.setColumns(20);
        jTextArea1.setEditable(false);
        jTextArea1.setRows(5);
        jTextArea1.setText(control.getPrintAllStockItems());
        jScrollPane1.setViewportView(jTextArea1);
        productIdLabel.setText("Varenummer:");
        numberOfItems.setText("Antal:");
        basketButton.setText("L?g i kurv");
        basketButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                putInBasket(evt);
        showBasketButton.setText("Vis indk?bskurv");
        showBasketButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                showBasket(evt);
        menu.setLabel("Fil");
        jMenu1.setText("Menu");
        menu.add(jMenu1);
        open.setLabel("?bn");
        open.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                open(evt);
        menu.add(open);
        quit.setLabel("Luk");
        quit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                quit(evt);
        menu.add(quit);
        jMenuItem1.setLabel("Gem");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                save(evt);
        menu.add(jMenuItem1);
        jMenuBar1.add(menu);
        jMenu2.setLabel("Hj?lp");
        help.setLabel("Hj?lp");
        help.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                help(evt);
        jMenu2.add(help);
        about.setLabel("Om Show White Shop");
        jMenu2.add(about);
        jMenuBar1.add(jMenu2);
        setJMenuBar(jMenuBar1);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(37, 37, 37)
                        .addComponent(jLabel1))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                .addComponent(productIdLabel)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(numberOfItems))
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 184, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(layout.createSequentialGroup()
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                    .addComponent(productId, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 65, Short.MAX_VALUE)
                                    .addComponent(basketButton))
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(31, 31, 31)
                                    .addComponent(jLabel2)))
                            .addGroup(layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(showBasketButton)))))
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 179, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 49, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(productIdLabel)
                            .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(numberOfItems)
                            .addComponent(productId, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(showBasketButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 202, Short.MAX_VALUE)
                        .addComponent(basketButton)))
                .addContainerGap())
        pack();
    }// </editor-fold>
    public void createBasketWindow(){
        basketGUI.setVisible(true);
    private void showBasket(java.awt.event.ActionEvent evt) {
        createBasketWindow();
    private void putInBasket(java.awt.event.ActionEvent evt) {
        Integer itemId = Integer.parseInt(itemIdField.getText());
        String petToAdd = control.getFindItem(itemId);
        System.out.println(petToAdd);
        control.setAddItemToBasket(itemId);
        basketGUI.addPetToBasket(petToAdd);
    private void help(java.awt.event.ActionEvent evt) {
    private void save(java.awt.event.ActionEvent evt) {
        System.out.println("Gemmer fil");
    private void open(java.awt.event.ActionEvent evt) {
        System.out.println("?bn fil");
    private void quit(java.awt.event.ActionEvent evt) {
        System.exit(0);
    public ShowWhite getControl(){
        return control;
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ShowWhiteGUI().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JMenuItem about;
    private javax.swing.JDialog aboutDialog;
    private javax.swing.JButton basketButton;
    private javax.swing.JMenuItem help;
    private javax.swing.JTextField itemIdField;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JMenu menu;
    private javax.swing.JLabel numberOfItems;
    private javax.swing.JMenuItem open;
    private javax.swing.JTextField productId;
    private javax.swing.JLabel productIdLabel;
    private javax.swing.JMenuItem quit;
    private javax.swing.JButton showBasketButton;
    // End of variables declaration
}BasketGUI:
* Basket.java
* Created on 5. februar 2008, 15:29
package userclasses;
import javax.swing.JTextArea;
* @author Lille mus
public class BasketGUI extends javax.swing.JFrame {
    private String newline = "\n";
    private InvoiceGUI invoiceGUI;
    /** Creates new form Basket */
    public BasketGUI() {
        initComponents();
        //invoiceGUI = new InvoiceGUI();
    public void addPetToBasket(String pet){
        jTextArea1.append(pet+newline);
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jButton1 = new javax.swing.JButton();
        itemIdField = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        removeItemButton = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Indk?bskurv");
        jLabel1.setText("Indk?bskurv");
        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);
        jButton1.setText("K?b og print kvittering");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                printInvoice(evt);
        jLabel2.setText("Slet varenr");
        removeItemButton.setText("Slet");
        removeItemButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                removeItemFromBasket(evt);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(21, 21, 21)
                        .addComponent(jLabel1))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 141, Short.MAX_VALUE)
                                .addComponent(jButton1))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(removeItemButton)))))
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(20, 20, 20)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton1)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 125, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(removeItemButton))
                .addContainerGap())
        pack();
    }// </editor-fold>
    private void removeItemFromBasket(java.awt.event.ActionEvent evt) {
        Integer itemId = Integer.parseInt(itemIdField.getText());
    private void printInvoice(java.awt.event.ActionEvent evt) {
        //invoiceGUI.setVisible(true);
    public JTextArea getTextArea(){
        return jTextArea1;
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new BasketGUI().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JTextField itemIdField;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JButton removeItemButton;
    // End of variables declaration
}ShowWhite:
* ShowWhite.java
* Created on 13. februar 2008, 18:15
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package userclasses;
* @author Lille mus
public class ShowWhite {
    public Basket basket;
    public Stock stock;
    /** Creates a new instance of ShowWhite */
    public ShowWhite() {
        stock = new Stock();
        basket = new Basket();
    public String getFindItem(int itemId){
        String returnItem = stock.findItem(itemId);
        return returnItem;
    public void setAddItemToBasket(int itemId){
        basket.addItemToBasket(itemId);
    public String getPrintAllStockItems(){
        return stock.printAllStockItems();
    public String getShowBasket(){
         return basket.showBasket();
    public void setRemoveItemFromBasket(int itemId){
        basket.removeItemFromBasket(itemId);
}

okay i tried this, but it give me a nullpointerexeption:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at userclasses.ShowWhiteGUI.initComponents(ShowWhiteGUI.java:75)
at userclasses.ShowWhiteGUI.<init>(ShowWhiteGUI.java:21)
at userclasses.ShowWhite.<init>(ShowWhite.java:26)
at userclasses.Main.<init>(Main.java:16)
at userclasses.Main$1.run(Main.java:31)
ShowWhite
public class ShowWhite {
    public Basket basket;
    public Stock stock;
    private ShowWhiteGUI mainGUI;
    private BasketGUI basketGUI;
    /** Creates a new instance of ShowWhite */
    public ShowWhite() {
        stock = new Stock();
        basket = new Basket();
        mainGUI = new ShowWhiteGUI(this);
        basketGUI = new BasketGUI();
    public String getFindItem(int itemId){
        String returnItem = stock.findItem(itemId);
        return returnItem;
    public void setAddItemToBasket(int itemId){
        basket.addItemToBasket(itemId);
    public String getPrintAllStockItems(){
        return stock.printAllStockItems();
    public String getShowBasket(){
         return basket.showBasket();
    public void setRemoveItemFromBasket(int itemId){
        basket.removeItemFromBasket(itemId);
    public void createMainGUI(){
        mainGUI.setVisible(true);
    public BasketGUI getBasketGUI(){
        return basketGUI;
    public void setAddPetToBasket(String pet){
        basketGUI.addPetToBasket(pet);
}ShowWhiteGUI:
public class ShowWhiteGUI extends javax.swing.JFrame {
    private ShowWhite control;
    /** Creates new form ShowWhiteGUI */
    public ShowWhiteGUI(ShowWhite control) {
        initComponents();
        this.control = control;
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        aboutDialog = new javax.swing.JDialog();
        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        itemIdField = new javax.swing.JTextField();
        productIdLabel = new javax.swing.JLabel();
        numberOfItems = new javax.swing.JLabel();
        productId = new javax.swing.JTextField();
        basketButton = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        showBasketButton = new javax.swing.JButton();
        jMenuBar1 = new javax.swing.JMenuBar();
        menu = new javax.swing.JMenu();
        jMenu1 = new javax.swing.JMenu();
        open = new javax.swing.JMenuItem();
        quit = new javax.swing.JMenuItem();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();
        help = new javax.swing.JMenuItem();
        about = new javax.swing.JMenuItem();
        javax.swing.GroupLayout aboutDialogLayout = new javax.swing.GroupLayout(aboutDialog.getContentPane());
        aboutDialog.getContentPane().setLayout(aboutDialogLayout);
        aboutDialogLayout.setHorizontalGroup(
            aboutDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        aboutDialogLayout.setVerticalGroup(
            aboutDialogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Show White's Shop");
        setBackground(new java.awt.Color(0, 102, 255));
        jLabel1.setFont(new java.awt.Font("Baby Kruffy", 0, 36));
        jLabel1.setText("Snow White?s Shop");
        jTextArea1.setColumns(20);
        jTextArea1.setEditable(false);
        jTextArea1.setRows(5);
        jTextArea1.setText(control.getPrintAllStockItems());
        jScrollPane1.setViewportView(jTextArea1);
        productIdLabel.setText("Varenummer:");
        numberOfItems.setText("Antal:");
        basketButton.setText("L?g i kurv");
        basketButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                putInBasket(evt);
        showBasketButton.setText("Vis indk?bskurv");
        showBasketButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                showBasket(evt);
        menu.setLabel("Fil");
        jMenu1.setText("Menu");
        menu.add(jMenu1);
        open.setLabel("?bn");
        open.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                open(evt);
        menu.add(open);
        quit.setLabel("Luk");
        quit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                quit(evt);
        menu.add(quit);
        jMenuItem1.setLabel("Gem");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                save(evt);
        menu.add(jMenuItem1);
        jMenuBar1.add(menu);
        jMenu2.setLabel("Hj?lp");
        help.setLabel("Hj?lp");
        help.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                help(evt);
        jMenu2.add(help);
        about.setLabel("Om Show White Shop");
        jMenu2.add(about);
        jMenuBar1.add(jMenu2);
        setJMenuBar(jMenuBar1);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(37, 37, 37)
                        .addComponent(jLabel1))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                .addComponent(productIdLabel)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(numberOfItems))
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 184, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(layout.createSequentialGroup()
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                    .addComponent(productId, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 65, Short.MAX_VALUE)
                                    .addComponent(basketButton))
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(31, 31, 31)
                                    .addComponent(jLabel2)))
                            .addGroup(layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(showBasketButton)))))
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 179, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 49, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(productIdLabel)
                            .addComponent(itemIdField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(numberOfItems)
                            .addComponent(productId, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(showBasketButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 202, Short.MAX_VALUE)
                        .addComponent(basketButton)))
                .addContainerGap())
        pack();
    }// </editor-fold>
    public void createBasketWindow(){
        control.getBasketGUI().setVisible(true);
    private void showBasket(java.awt.event.ActionEvent evt) {
        createBasketWindow();
    private void putInBasket(java.awt.event.ActionEvent evt) {
        Integer itemId = Integer.parseInt(itemIdField.getText());
        String petToAdd = control.getFindItem(itemId);
        System.out.println(petToAdd);
        control.setAddItemToBasket(itemId);
        control.setAddPetToBasket(petToAdd);
    private void help(java.awt.event.ActionEvent evt) {
    private void save(java.awt.event.ActionEvent evt) {
        System.out.println("Gemmer fil");
    private void open(java.awt.event.ActionEvent evt) {
        System.out.println("?bn fil");
    private void quit(java.awt.event.ActionEvent evt) {
        System.exit(0);
    public ShowWhite getControl(){
        return control;
    // Variables declaration - do not modify
    private javax.swing.JMenuItem about;
    private javax.swing.JDialog aboutDialog;
    private javax.swing.JButton basketButton;
    private javax.swing.JMenuItem help;
    private javax.swing.JTextField itemIdField;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JMenu menu;
    private javax.swing.JLabel numberOfItems;
    private javax.swing.JMenuItem open;
    private javax.swing.JTextField productId;
    private javax.swing.JLabel productIdLabel;
    private javax.swing.JMenuItem quit;
    private javax.swing.JButton showBasketButton;
    // End of variables declaration
}

How to add objects to panel in one class from another class

Hi this is what i am trying to do. I have a drag and adrop tool working where the users and select objects on a small panel and drag them to another panel called the tpan. What i want to do is create another class, which creates objects and now i want to display these objects on the tpan. So say i have a class DisplayTpan(), this class is used to display the objects which have been dragged from the small panel, and objects on this panel have mouselisteners attached, so that these objects can be moved around on the tpan. I have created another class called creatObj(), and from this class i want to add objects to the tpan. The DisplayTpan class extends a Jpanel, would this be he case for the CreateObj() class? In the CreateClass i have made a call to DisplayTpan t = new DisplayTPan();
t.add(object);
But this does not add the object to the panel, any ideas on how it should be done?
Problem number two i have is say, I have two objects created on that oanel, i now want to draw a line t connect the two objects, this is just simply a call to the drawLine function but how would it be possible to add a ,mouselistener to that line, so it can be extended moved around etc? Any help much appreciated thanks.

Try to convert the PL/SQL code from Forms trigger into a PL/SQL library(.PLL),
and then attach that PLL in your forms.
Note that all Forms objects should be referenced indirectly, for example,
you have to rewrite
:B1.DEPT_CODE := :B2.DEPT_CODE;
:B3.TOTAL_AMOUNT := 100;
==>
copy('B2.DEPT_NO','B1.DEPT_NO');
copy('100','B3.TOTAL_AMOUNT');
This is the best way to share PL/SQL code among Oracle Forms.

How to add objects to panel from another class?

Hi this is what i am trying to do. I have a drag and adrop tool working where the users and select objects on a small panel and drag them to another panel called the tpan. What i want to do is create another class, which creates objects and now i want to display these objects on the tpan. So say i have a class DisplayTpan(), this class is used to display the objects which have been dragged from the small panel, and objects on this panel have mouselisteners attached, so that these objects can be moved around on the tpan. I have created another class called creatObj(), and from this class i want to add objects to the tpan. The DisplayTpan class extends a Jpanel, would this be he case for the CreateObj() class? In the CreateClass i have made a call to DisplayTpan t = new DisplayTPan();
t.add(object);
But this does not add the object to the panel, any ideas on how it should be done?
Problem number two i have is say, I have two objects created on that oanel, i now want to draw a line t connect the two objects, this is just simply a call to the drawLine function but how would it be possible to add a ,mouselistener to that line, so it can be extended moved around etc? Any help much appreciated thanks.

As for your first problem...too confusing...too tired...mb tomorrow it will make sense :)
Fer the second...no need to add a mouse listener to each line. There are a couple options that spring to mind, the easiest I can think of is just check to see if the mouse click intersects with any of the lines (bit of geometry).
The second, ugly but a hella allot more accurate and better (me thinks), is to create a bounding box around the line, so the user doesn't have to click right right on the line. I created this bounding box by painting the pixels with a special key to correspond to that line. The other nice thing about this key is the fact that the lookup is quick.
The first step was the create a array of integers the size of the surface. Whenever a line is drawn on the graphical surface, do a corresponding line in the integer array, and create the bounding box inside this invisible array. Now whenever the user clicks just do a lookup into this array and check to see which line was selected...then go to town.
If you want a more detailed explination, i'll post some code later.

Calling a object of class from other class's function with in a package

Hello Sir,
I have a package.package have two classes.I want to use object of one class in function of another class of this same package.
Like that:
one.java
package co;
public class one
private String aa="Vijay"; //something like
}main.java:
package co;
import java.util.Stack;
public class main extends Stack
public void show(one obj)
push(obj);
public static void main(String args[])
main oo=new main();
}when I compile main class, Its not compile.
Its give error.can not resolve symbol:
symbol: class one
location: class co.main
public void show(one obj)
^Please help How that compile "Calling a object of class from other class's function with in a package" beacuse I want to use this funda in an application

kumar.vijaydahiya wrote:
.It is set in environment variable.path=C:\bea\jdk141_02\bin;.,C:\oraclexe\app\oracle\product\10.2.0\server\bin;. command is:
c:\Core\co\javac one.javaIts compiled already.
c:\Core\co\javac main.javaBut it give error.
Both java classes in co package.Okay, open a command prompt and execute these two commands:
// to compile both classes:
javac -cp c:\Core c:\Core\co\*.java
// to run your main-class:
java -cp c:\Core co.main

Can I invoke a class that extends JAppl from another class extends JAppl

Can I invoke a class that extends JApplet from another class that extends JApplet. I need to invoke an applet then select an action which opens another applet. Thanks in advance.

Nobody is able to solve this problem, i cant even
think this things. i have hope so plz try and get
result and help.Did you understand what Sharad has said???
Yep, you can forward to specific error page from servlet when even error occured in JSP. In order to achieve you have to open jsp file from servlet say example by using reqdisp.forward.
handle exception in the part where you are forwarding. And forward to the specific error page inside catch block.

How to extend/ replace generated classes from JAXB

Hello Experts,
In our application (Which uses Java Webdynpro as the UI and RFCs for the backend access- an R/3 System), there is a need to construct an XML file (from the data entered by the user) which will be later accepted by the backend system. Now to avoid manual creation of the XML document, what we did is that we created an XSD file based on the back end structure (This XSD contains definition for all the possible fields and structures in the back end).
Then we used the JAXB implementation to automatically create Java Objects from the XSD file. We populate this JAXB generated Java objects and then use the Serialization framework to serialize them into an XML file.
This all works well, provided that the structure of the back end system does not change, but unfortunately it can, customer can add additional attributes to the existing structures (They do not create new structures, just add new attributes to it so I do not need to create new Java Object classes at runtime, I need only to add attributes to them). If they do so, the XSD and corresponding Java Objects (which are shipped as part of the source code) do not remain valid anymore as the automatically generated Objects (which correspond to the structures in the back end) would not have the definition of the newly added attributes.
Can anyone please suggest how to overcome this limitation with JAXB.
The needed functionality is that somehow I should be able to add fields (corresponding to the customer added attributes) to the automatically created Java objects and thus pass the data in the additional attribute to the backend. (Please note that at runtime using an RFC, I can find out the current structure of the backend but the structure at the Webdynpro end (set of Java objects generated from the JAXB) is static and is a part of the code).
Any comments/suggestions could be of great help.
Thanks
Amit Kapoor

You cannot do that. TheJAVA language does not allow a class to "extend" more than one upper class.
Typically, the solution is to modify your architecture a little bit. Just use the "has a" relationship instead of "is a". That means something like that:public class MyFraisMessage
extends MyOtherClass
private FraisMessage message;
etc...You write an extension "MyFraisMessage" of your upper class "MyOtherClass", which has the JAXB generated object as an attribute. This structure is often useful, when you think you would need multiple inheritance.

Accessing the same object from multiple classes.

For the life of me I can't workout how I can access things from classes that haven't created them.
I don't want to have to use "new" multiple times in seperate classes as that would erase manipulated values.
I want to be able to access and manipulate an array of objects from multiple classes without resetting the array object values. How do I create a new object then be able to use it from all classes rather than re-creating it?
Also I need my GUI to recognize the changes my buttons are making to data and reload itself so they show up.
All help is good help!
regards,
Luke Grainger

As long as you have a headquarters it shouldn't be to painfull. You simply keep a refrence to your ShipDataBase and Arsenal and all your irrellevant stuff in Headquarters. So the start of your Headquarters class would look something like:
public class Headquarters{
public Arsenal arsenal;
public ShipDatabase db;
//constructor
public Headquarters(){
    arsenal = new Arsenal(this, ....);
    db = new ShipDatabase(...);
//The Arsenal class:
public class Arsenal{
public Headquarter hq;
public Arsenal(Headquarter hq, ....){
    this.hq = hq;
    .Then in your ShipDatabase you should, as good programing goes, keep the arraylist as a private class variable, and then make simple public methods to access it. Methods like getShipList(), addToShipList(Ship ship)....
So when you want to add a ship from arsenal you write:
hq.db.addToShipList(ship);
.Or you could of course use a more direct refrence:
ShipDatabase db = hq.db;
or even
ShipList = hq.db.getShipList();
but this requires that the shiplist in the DB is kept public....
Hope it was comprehensive enough, and that I answered what you where wondering.
Sjur
PS: Initialise the array is what you do right here:
//constructor
shipList = new Ship[6];
shipList[0] = new Ship("Sentry", 15, 10, "Scout");
" " " "etc
shipList[5] = new Ship("Sentry", 15, 10, "Scout");PPS: To make code snippets etc. more readable please read this article:
http://forum.java.sun.com/faq.jsp#messageformat

Adding a JPanel from one class to another Class (which extends JFrame)

Hi everyone,
So hopefully I go about this right, and I can figure out what I'm doing wrong here. As an exercise, I'm trying to write a Tic-Tac-Toe (TTT) game. However, in the end it will be adaptable for different variations of TTT, so it's broken up some. I have a TTTGame.java, and TTTSquareFrame.java, and some others that aren't relavent.
So, TTTGame:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import joshPack.jUtil.*;
public class TTTGame extends JFrame
     private Integer sides = 3;
     private TTTSquareFrame mainSquare;
     private TTTGame newGame;
     private Container contents;
     private JPanel mainSquarePanel, addPanel;
     public static void main(String [] args)
          TTTGame newGame = new TTTGame();
          newGame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public TTTGame()
          super("Tic-Tac-Toe");
          contents = getContentPane();
          contents.setLayout(new FlowLayout());
          addPanel = startSimple();
          if(!addPanel.isValid())
               System.out.println("Something's wrong");
          contents.add(addPanel);
          setSize(300, 300);
          setVisible(true);
     public JPanel startSimple()
          mainSquare = new TTTSquareFrame(sides);
          mainSquarePanel = mainSquare.createPanel(sides);
          return mainSquarePanel;
}and TTTSquareFrame:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import joshPack.jUtil.Misc;
public class TTTSquareFrame
     private JPanel squarePanel;
     private JButton [] squares;
     private int square, index;
     public TTTSquareFrame()
          System.out.println("Use a constructor that passes an integer specifying the size of the square please.");
          System.exit(0);
     public TTTSquareFrame(int size)
     public JPanel createPanel(int size)
          square = (int)Math.pow(size, 2);
          squarePanel = new JPanel();
          squarePanel.setLayout(new GridLayout(3,3));
          squares = new JButton[square];
          System.out.println(MIN_SIZE.toString());
          for(int i = 0; i < square; i++)
               squares[i] = new JButton();
               squares.setRolloverEnabled(false);
               squares[i].addActionListener(bh);
               //squares[i].setMinimumSize(MIN_SIZE);
               squares[i].setVisible(true);
               squarePanel.add(squares[i]);
          squarePanel.setSize(100, 100);
          squarePanel.setVisible(true);
          return squarePanel;
}I've successfully added panels to JFrame within the same class, and this is the first time I'm modularizing the code this way. The issue is that the frame comes up blank, and I get the message "Something's wrong" and it says the addPanel is invalid. Originally, the panel creation was in the constructor for TTTSquareFrame, and I just added the mainSquare (from TTTGame class) to the content pane, when that didn't work, I tried going about it this way. Not exactly sure why I wouldn't be able to add the panel from another class, any help is greatly appreciated.
I did try and cut out code that wasn't needed, if it's still too much let me know and I can try and whittle it down more. Thanks.

Yea, sorry 'bout that, I just cut out the parts of the files that weren't relevant but forgot to compile it just to make sure I hadn't left any remnants of what I had removed. For whatever it's worth, I have no idea what changed, but something did and it is working now. Thanks for your help, maybe next time I'll post an actual question that doesn't somehow magically solve itself.
EDIT: Actually, sorry, I've got the panel working now, but it's tiny. I've set the minimum size, and I've set the size of the panel, so...why won't it respond to that? It almost looks like it's being compressed into the top of the panel, but I'm not sure why.
I've compressed the code into:
TTTGame.java:
import java.awt.*;
import javax.swing.*;
public class TTTGame extends JFrame
     private Integer sides = 3;
     private TTTSquareFrame mainSquare;
     private TTTGame newGame;
     private Container contents;
     private JPanel mainSquarePanel, addPanel;
     public static void main(String [] args)
          TTTGame newGame = new TTTGame();
          newGame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     public TTTGame()
          super("Tic-Tac-Toe");
          contents = getContentPane();
          contents.setLayout(new FlowLayout());
          mainSquare = new TTTSquareFrame(sides.intValue());
          contents.add(mainSquare);
          setSize(400, 400);
          setVisible(true);
}TTTSquareFrame.java
import java.awt.*;
import javax.swing.*;
public class TTTSquareFrame extends JPanel
     private JButton [] squares;
     private int square, index;
     private final Dimension testSize = new Dimension(50, 50);
     public TTTSquareFrame(int size)
          super();
          square = (int)Math.pow(size, 2);
          super.setLayout(new GridLayout(size, size));
          squares = new JButton[square];
          for(int i = 0; i < square; i++)
               squares[i] = new JButton();
               squares.setMinimumSize(testSize);
               squares[i].setVisible(true);
               super.add(squares[i]);
          setSize(200, 200);
          setVisible(true);
I've made sure the buttons are smaller than the size of the panel, and the panel is smaller than the frame, so...
Message was edited by:
macman104

Why can't I create new object from a class that is in my big class?

I mean:
class A
B x = new B;
class B
and how can I solve it if I still want to create an object from B class.
Thank you very much :)

public class ItWorksNow {
public ItWorksNow() {
public static void main ( String[] argv ) throws Exception {
ItWorksNow.DaInnaClass id = new ItWorksNow().new DaInnaClass();
public class DaInnaClass {
}

Correct handling of objects extended from FX classes

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