Use method from father class for event

Hi,
I want to use a preDelete event in my class, but the method I would like to call for the event is not in the class itself, but in the (abstract) predecessor class. Any chance to do this? At the moment I can't select the method in the event tab page (it's not in the list to choose from ...)
Thank you!
J.F.

In 9.0.4 you will need to add the parent class as a descriptor and choose to deactivate it. This will allow you to choose methods from that class in the subclass descriptors.
In 10.1.3 there is a dialog for specifying classes that are not persistent, but necessary in other persistent classes: http://www.oracle.com/technology/products/ias/toplink/doc/1013/main/_html/mw007.htm#sthref629
A good explanation of why we don't store the parent and referenced classes unless explictly asked can be found here: Re: Mapping Workbench 10.1.3.0 Bug - Cannot add Implemented Interfaces
Hope this helps,
Karen

Similar Messages

Use methods in other classes

Can I use methods from other classes than the class that myClass extends?
ex. myClass extends parentClass{
myMethod()
myMethod() is declared in i third class. Is this possible or can I only use classes from the parent class?
-Thanks-

I'm not really sure what the previous two answers were getting at.
Yes, you can use methods all the way up the class hierarchy, as long as they are visible.
For example, Object implements toString(). You can call toString() on any object in Java and it will render the object to a string in one way or another. That is because toString() is public.
If toString() were protected, you would only be able to call the method if you were a subclass of of that object (or in the same package), which would make the toString() method much less useful.
I would suggest reading up on the differences in the four visibility modifiers (private, (default), protected, and public). Private is the only one which nothing else can call. If you are public or protected, any subclass can call the method, even if there are 20 superclasses between the implementor and the caller.
Good luck!
Steve

Use a method from another class in another package?

How can I use a method from another class in another package?

WhiteJ wrote:
What do you mean by "new keyword?" You posted this previously:
I tried that, it seems to not be working. I want to use the constructor from the other class. I imported it, using this piece of code:
import components.FileChooser;
components.FileChoser();
Typically if I am going to call a constructor on a class called Fubar, I'd use new to create a new object:
Fubar myFubar = new Fubar();Incidently, is it a simple typo in your post or are you trying to use a FileChoser object when it should be FileChooser?

Which are the standard classes for events in ALV and explain each class pls

which are the standard classes for events in ALV and explain each class pls
POINTS WILL BE AWARDED,
REGARDS,
jagrut bharatkumar Shukla

hi,
some links.
www.sapgenie.com
www.abap4u.com
http://help.sap.com/saphelp_nw2004s/helpdata/en/5e/88d440e14f8431e10000000a1550b0/frameset.htm
download the PDF from following link.
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCSRVALV/BCSRVALV.pdf
The ALV object Grid methods allow the same functionality as ALV grid report function modules but are displayed within
a screen (dialog program). SAP has provided a suit of programs which demonstrate how to For examples see standard SAP
programs as detailed below:
BCALV_EDIT_01 This report illustrates the simplest case of using an editable/noneditable ALV Grid Control.
BCALV_EDIT_02 This report illustrates how to set chosen cells of an ALV Grid Control editable.
BCALV_EDIT_03 In this example the user may change values of fields SEATSOCC (occupied seats) and/or PLANETYPE.
The report checks the input value(s) semantically and provides protocol messages in case of error
BCALV_EDIT_04 This report illustrates how to add and remove lines to a table using the ALV Grid Control and how to
implement the saving of the new data.
BCALV_EDIT_05 This example shows how to use checkboxes within an ALV Grid Control. You learn:
     (1) how to define a column for editable checkboxes for an attribute of your list
     (2) how to evaluate the checked checkboxes
     (3) how to switch between editable and non-editable checkboxes
BCALV_EDIT_06 This example shows how to define a dropdown listbox for all cells of one column in an editable ALV
Grid Control.
BCALV_EDIT_07 This example shows how to define dropdown listboxes for particular cells of your output table.
BCALV_EDIT_08 This report implements an ALV Grid Control with an application specific F4 help. The following aspects
are dealt with:
     (1) how to replace the standard f4 help
     (2) how to pass the selected value to the ALV Grid Control
     (3) how to build an f4 help, whose value range depend on a value of another cell.
Rgds
Anversha

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
}

Calling results of a method from another class

Very very new to Java, so apologies for the lack of basic knowledge. I am making a programme with 3 classes. One class gathers details about a module. Another about the results of this module (which requires some of the information inputted for the first class). For some reason I cannot find how to use results created in the first class in this second class. How do you call the results of a method from one class in another class?
Thanks.

Thank you.
I am given the following information:
'_ModuleRecord_
This class is used to record information about a module taken by a single student. It has a constructor that takes three parameters:
a Module,
an int representing the examination mark achieved by a student, and
an int representing the coursework mark achieved by a student.
The class has another constructor that takes a single Module parameter.'
and the code looks like this:
public class ModuleRecord
public ModuleRecord(Module m, int eMark, int cMark)
public ModuleRecord(Module m)
} I am a bit confused by the whole thing to be honest. I assume that the Module is referring to the other class, but how do I forge the link between them here?

ABAP Objects : calling one method from another class

Hi,
Can you please tell me how to call method from one class or interfce to another class.The scenario is
I have one class CL_WORKFLOW_TASK, this class have interface IF_WORKFLOW_TASK & this interface have method IF_WORKFLOW_TASK~CLOSE. Now my requirement is ,
There is another class CL_WORKFLOW_CHAIN ,this class have interface IF_WORKFLOW_CHAIN & this interface have method IF_WORKFLOW_CHAINCLOSE_ALL_PREDECESSORS. Now i have to write my code in this method but i have to use IF_WORKFLOW_TASKCLOSE method for closing the task.
Can you please give me the code for the above .
Please waiting for reply.

Hi,
You can use the concept of INHERITANCE in this scenario.By using this concept, you can call all the public and protected methods of class CL_WORKFLOW_TASK in the required calss CL_WORKFLOW_CHAIN as per your requirement.
Go through the Introdctory(INHERITANCE) programming from this SAPHELP link.
http://help.sap.com/saphelp_nw70/helpdata/en/1d/df5f57127111d3b9390000e8353423/content.htm
I hope, it will help in you inresolving your problem.
by
Prasad GVK.

Calling a non-static method from another Class

Hello forum experts:
Please excuse me for my poor Java vocabulary. I am a newbie and requesting for help. So please bear with me! I am listing below the program flow to enable the experts understand the problem and guide me towards a solution.
1. ClassA instantiates ClassB to create an object instance, say ObjB1 that
    populates a JTable.
2. User selects a row in the table and then clicks a button on the icon toolbar
    which is part of UIMenu class.
3. This user action is to invoke a method UpdateDatabase() of object ObjB1. Now I want to call this method from UIMenu class.
(a). I could create a new instance ObjB2 of ClassB and call UpdateDatabase(),
                                  == OR ==
(b). I could declare UpdateDatabase() as static and call this method without
     creating a new instance of ClassB.With option (a), I will be looking at two different object instances.The UpdateDatabase() method manipulates
object specific data.
With option (b), if I declare the method as static, the variables used in the method would also have to be static.
The variables, in which case, would not be object specific.
Is there a way or technique in Java that will allow me to reference the UpdateDatabase() method of the existing
object ObjB1 without requiring me to use static variables? In other words, call non-static methods in a static
way?
Any ideas or thoughts will be of tremendous help. Thanks in advance.

Hello Forum:
Danny_From_Tower, Encephalatic: Thank you both for your responses.
Here is what I have done so far. I have a button called "btnAccept" created in the class MyMenu.
and declared as public.
public class MyMenu {
    public JButton btnAccept;
     //Constructor
     public MyMenu()     {
          btnAccept = new JButton("Accept");
}     I instantiate an object for MyMenu class in the main application class MyApp.
public class MyApp {
     private     MyMenu menu;
     //Constructor
     public MyApp(){
          menu = new MyMenu();
     public void openOrder(){
           MyGUI MyIntFrame = new MyGUI(menu.btnAccept);
}I pass this button all the way down to the class detail02. Now I want to set up a listener for this
button in the class detail02. I am not able to do this.
public class MyGUI {
     private JButton acceptButton;
     private detail02 dtl1 = new detail02(acceptButton);
     //Constructor
     public AppGUI(JButton iButton){
     acceptButton = iButton;
public class detail02{
    private JButton acceptButton;
    //Constructor
    public detail02(JButton iButton){
      acceptButton = iButton;
      acceptButton.addActionListener(new acceptListener());
   //method
    private void acceptListener_actionPerformed(ActionEvent e){
       System.out.println("Menu item [" + e.getActionCommand( ) + "] was pressed.");
    class acceptListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
               acceptListener_actionPerformed(e);
} I am not able to get the button Listener to work. I get NullPointerException at this line
          acceptButton.addActionListener(new acceptListener());in the class detail02.
Is this the right way? Or is there a better way of accomplishing my objective?
Please help. Your inputs are precious! Thank you very much for your time!

Is it possible to call methods from another class from within an abstract c

Is it possible to call methods from another class from within an abstract class ?

I found an example in teh JDK 131 JFC that may help you. I t is using swing interface and JTable
If you can not use Swing, then you may want to do digging or try out with the idea presented here in example 3
Notice that one should refine the abstract table model and you may want to create a method for something like
public Object getValuesAtRow(int row) { return data[row;}
to give the desired row and leave the method for
getValuesAt alone for getting valued of particaular row and column.
So Once you got the seelcted row index, idxSelctd, from your table
you can get the row or set the row in your table model
public TableExample3() {
JFrame frame = new JFrame("Table");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}});
// Take the dummy data from SwingSet.
final String[] names = {"First Name", "Last Name", "Favorite Color",
"Favorite Number", "Vegetarian"};
final Object[][] data = {
     {"Mark", "Andrews", "Red", new Integer(2), new Boolean(true)},
     {"Tom", "Ball", "Blue", new Integer(99), new Boolean(false)},
     {"Alan", "Chung", "Green", new Integer(838), new Boolean(false)},
     {"Jeff", "Dinkins", "Turquois", new Integer(8), new Boolean(true)},
     {"Amy", "Fowler", "Yellow", new Integer(3), new Boolean(false)},
     {"Brian", "Gerhold", "Green", new Integer(0), new Boolean(false)},
     {"James", "Gosling", "Pink", new Integer(21), new Boolean(false)},
     {"David", "Karlton", "Red", new Integer(1), new Boolean(false)},
     {"Dave", "Kloba", "Yellow", new Integer(14), new Boolean(false)},
     {"Peter", "Korn", "Purple", new Integer(12), new Boolean(false)},
     {"Phil", "Milne", "Purple", new Integer(3), new Boolean(false)},
     {"Dave", "Moore", "Green", new Integer(88), new Boolean(false)},
     {"Hans", "Muller", "Maroon", new Integer(5), new Boolean(false)},
     {"Rick", "Levenson", "Blue", new Integer(2), new Boolean(false)},
     {"Tim", "Prinzing", "Blue", new Integer(22), new Boolean(false)},
     {"Chester", "Rose", "Black", new Integer(0), new Boolean(false)},
     {"Ray", "Ryan", "Gray", new Integer(77), new Boolean(false)},
     {"Georges", "Saab", "Red", new Integer(4), new Boolean(false)},
     {"Willie", "Walker", "Phthalo Blue", new Integer(4), new Boolean(false)},
     {"Kathy", "Walrath", "Blue", new Integer(8), new Boolean(false)},
     {"Arnaud", "Weber", "Green", new Integer(44), new Boolean(false)}
// Create a model of the data.
TableModel dataModel = new AbstractTableModel() {
// These methods always need to be implemented.
public int getColumnCount() { return names.length; }
public int getRowCount() { return data.length;}
public Object getValueAt(int row, int col) {return data[row][col];}
// The default implementations of these methods in
// AbstractTableModel would work, but we can refine them.
public String getColumnName(int column) {return names[column];}
public Class getColumnClass(int col) {return getValueAt(0,col).getClass();}
public boolean isCellEditable(int row, int col) {return (col==4);}
public void setValueAt(Object aValue, int row, int column) {
data[row][column] = aValue;
};

Doubt on exec method from Process class

i want to use exec method from Process class to run an external exe.
now the problem is that Process is an abstract class and hence cant be instantiated.nor can i access exec method directly even though i import the required packages as its not static.how can i go about using exec() if thats the case.
Also can i run a file like notepad.exe present in system32 by providing the path of notepad.exe as an arguement in exec

i would be really grateful to you if you can write
the syntax for me along eith the class.i tried it out
and i got a lot of errors
this is what i obbtained from the documentation
"public Process exec(String command)
throws IOException"
l to comprehend is what that class Process is doing
in the syntax.from the method its supposed to return
Process class.can you explain it and the usage of
exec too
import java.lang.*;
class abc
Runtime ob1;
ob1.exec("c:\\windows\\system32\\notepad.exe");
//i am getting a compile time error for this code
which cites that <identifier> required at line 6You need to put the exec call in a method or constructor. You can't just place code anywhere within a class.
You should also cal Runtime.exec just as I told you. It's a static method.
There are lots of examples if you google.
Kaj

Moving a method from one class to another issues

Hi, im new. Let me explain what i am trying to achieve. I am basically trying to move a method from one class to another in order to refactor the code. However every time i do, the program stops working and i am struggling. I have literally tried 30 times these last two days. Can some one help please? If shown once i should be ok, i pick up quickly.
Help would seriously be appreciated.
Class trying to move from, given that this is an extraction:
class GACanvas extends Panel implements ActionListener, Runnable {
private WorldMenuItems speedMenuItems, designMenuItemsPlantGrowth, designMenuItemsPlantCount;
     private WorldMenuItems designMenuItemsPlantEaten, designMenuItemsApproximatePopulation;
     private WorldMenuItems designMenuItemsEatersBorn,designMenuItemsMutationProbability;
     private WorldMenuItems designMenuItemsCrossoverProbability;
MenuBar getMenuBar() {
          menuBar = new MenuBar();
          addControlItemsToMenuBar();
          addSpeedItemsToMenuBar();
          addWorldDesignItemsToMenuBar();
          return menuBar;
This is the method i am trying to move (below)
public void itemsInsideWorldDesignMenu() {
          designMenuItemsPlantGrowth = new WorldMenuItems("Plants Grow",
                    new String[] { "In Rows", "In Clumps", "At Random",
                              "Along the Bottom", "Along the Edges" }, 1);
          designMenuItemsPlantCount = new WorldMenuItems("Number Of Plants",
                    new String[] { "50", "100", "150", "250", "500" }, 3);
          designMenuItemsPlantEaten = new WorldMenuItems("When a Plant is Eaten",
                    new String[] { "It grows back somewhere",
                              "It grows back nearby", "It's Gone" }, 0);
          designMenuItemsApproximatePopulation = new WorldMenuItems(
                    "Approximate Population", new String[] { "10", "20", "25",
                              "30", "40", "50", "75", "100" }, 2);
          designMenuItemsEatersBorn = new WorldMenuItems("Eaters are Born",
                    new String[] { "At the Center", "In a Corner",
                              "At Random Location", "At Parent's Location" }, 2);
          designMenuItemsMutationProbability = new WorldMenuItems(
                    "Mutation Probability", new String[] { "Zero", "0.25%", "0.5%",
                              "1%", "2%", "3%", "5%", "10%" }, 3);
          designMenuItemsCrossoverProbability = new WorldMenuItems(
                    "Crossover Probability", new String[] { "Zero", "10%", "25%",
                              "50%", "75%", "100%" }, 4);
Class Trying to move to:
class WorldMenuItems extends Menu implements ItemListener {
   private CheckboxMenuItem[] items;
   private int selectedIndex = -1;
   WorldMenuItems(String menuName, String[] itemNames) {
      this(menuName, itemNames, -1);
   WorldMenuItems(String menuName, String[] itemNames, int selected) {
      super(menuName);
      items = new CheckboxMenuItem[itemNames.length];
      for (int i = 0; i < itemNames.length; i++) {
         items[i] = new CheckboxMenuItem(itemNames);
add(items[i]);
items[i].addItemListener(this);
selectedIndex = selected;
if (selectedIndex < 0 || selectedIndex >= items.length)
selectedIndex = 1;
items[selectedIndex].setState(true);
     public int getSelectedIndex() {
          return selectedIndex;
public void itemStateChanged(ItemEvent evt) { // This works on other systems
CheckboxMenuItem newSelection = (CheckboxMenuItem)evt.getSource();
for (int i = 0; i < items.length; i++) {
if (newSelection == items[i]) {
items[selectedIndex].setState(false);
selectedIndex = i;
newSelection.setState(true);
return;

Ok i've done this. I am getting an error on the line specified. Can someone help me out and tell me what i need to do?
GACanvas
//IM GETTING AN ERROR ON THIS LINE UNDER NAME, SAYING IT IS NOT VISIBLE
WorldMenuItems worldmenuitems = new WorldMenuItems(name, null);
public MenuBar getMenuBar() {
          menuBar = new MenuBar();
          addControlItemsToMenuBar();
          addSpeedItemsToMenuBar();
          worldmenuitems.addWorldDesignItemsToMenuBar();
          return menuBar;
class WorldMenuItems extends Menu implements ItemListener {
     private WorldMenuItems speedMenuItems, designMenuItemsPlantGrowth, designMenuItemsPlantCount;
     private WorldMenuItems designMenuItemsPlantEaten, designMenuItemsApproximatePopulation;
     private WorldMenuItems designMenuItemsEatersBorn,designMenuItemsMutationProbability;
     private WorldMenuItems designMenuItemsCrossoverProbability;
     GACanvas gacanvas = new GACanvas(null);
   private CheckboxMenuItem[] items;
   private int selectedIndex = -1;
   WorldMenuItems(String menuName, String[] itemNames) {
      this(menuName, itemNames, -1);
   WorldMenuItems(String menuName, String[] itemNames, int selected) {
      super(menuName);
      items = new CheckboxMenuItem[itemNames.length];
      for (int i = 0; i < itemNames.length; i++) {
         items[i] = new CheckboxMenuItem(itemNames);
add(items[i]);
items[i].addItemListener(this);
selectedIndex = selected;
if (selectedIndex < 0 || selectedIndex >= items.length)
selectedIndex = 1;
items[selectedIndex].setState(true);
     public int getSelectedIndex() {
          return selectedIndex;
public void itemStateChanged(ItemEvent evt) { // This works on other systems
CheckboxMenuItem newSelection = (CheckboxMenuItem)evt.getSource();
for (int i = 0; i < items.length; i++) {
if (newSelection == items[i]) {
items[selectedIndex].setState(false);
selectedIndex = i;
newSelection.setState(true);
return;
public void itemsInsideWorldDesignMenu() {
     designMenuItemsPlantGrowth = new WorldMenuItems("Plants Grow",
               new String[] { "In Rows", "In Clumps", "At Random",
                         "Along the Bottom", "Along the Edges" }, 1);
     designMenuItemsPlantCount = new WorldMenuItems("Number Of Plants",
               new String[] { "50", "100", "150", "250", "500" }, 3);
     designMenuItemsPlantEaten = new WorldMenuItems("When a Plant is Eaten",
               new String[] { "It grows back somewhere",
                         "It grows back nearby", "It's Gone" }, 0);
     designMenuItemsApproximatePopulation = new WorldMenuItems(
               "Approximate Population", new String[] { "10", "20", "25",
                         "30", "40", "50", "75", "100" }, 2);
     designMenuItemsEatersBorn = new WorldMenuItems("Eaters are Born",
               new String[] { "At the Center", "In a Corner",
                         "At Random Location", "At Parent's Location" }, 2);
     designMenuItemsMutationProbability = new WorldMenuItems(
               "Mutation Probability", new String[] { "Zero", "0.25%", "0.5%",
                         "1%", "2%", "3%", "5%", "10%" }, 3);
     designMenuItemsCrossoverProbability = new WorldMenuItems(
               "Crossover Probability", new String[] { "Zero", "10%", "25%",
                         "50%", "75%", "100%" }, 4);
public void addWorldDesignItemsToMenuBar() {
     gacanvas = new GACanvas(null);
     itemsInsideWorldDesignMenu();
     Menu designMenuItems = new Menu("WorldDesign");
     designMenuItems.add(designMenuItemsPlantGrowth);
     designMenuItems.add(designMenuItemsPlantCount);
     designMenuItems.add(designMenuItemsPlantEaten);
     designMenuItems.add(designMenuItemsApproximatePopulation);
     designMenuItems.add(designMenuItemsEatersBorn);
     designMenuItems.add(designMenuItemsMutationProbability);
     designMenuItems.add(designMenuItemsCrossoverProbability);
     gacanvas.menuBar.add(designMenuItems);

Calling a TextFields get method from another class as a String

This is my first post so be kind....
I'm trying to create a login screen with Java Studio Creator. The Login.jsp has a Text Field for both the username and password. JSC automatically created get and set methods for these.
public class Login extends AbstractPageBean
private TextField usernameTF = new TextField();
public TextField getUsernameTF() {
return usernameTF;
public void setUsernameTF(TextField tf) {
this.usernameTF = tf;
private PasswordField passwordTF = new PasswordField();
public PasswordField getPasswordTF() {
return passwordTF;
public void setPasswordTF(PasswordField pf) {
this.passwordTF = pf;
My problem is in trying to call these methods from another class and return the value as a string.
Any help on this matter would be greatly appreciated.

the method returns the textfield, so you just need to get its text
import java.awt.*;
class Testing
public Testing()
    Login login = new Login();
    System.out.println(login.getUsernameTF().getText());//<----
public static void main(String[] args){new Testing();}
class Login
private TextField usernameTF = new TextField("Joe Blow");
public TextField getUsernameTF() {
    return usernameTF;
}

Using methods from another Form C#

Hello!
I'm having some trouble using methods from one Form in another one. Here's the deal:
This is a snippet from my 'main' form:
public partial class PRINCIPAL : Form
//some variables here
Form2 Config = new Form2();
Form3 Cadastro = new Form3();
public PRINCIPAL()
InitializeComponent();
//code goes on and on
//Here's the method I want to call on the other forms (Form2 and Form3)
public void salva_banco()
this.Validate();
this.projetoBindingSource.EndEdit();
this.modulosBindingSource.EndEdit();
this.funcaoBindingSource.EndEdit();
this.estadosBindingSource.EndEdit();
this.tableAdapterManager.UpdateAll(this.database1DataSet);
//And here is where I show Form3
private void projetoDataGridView_CellDoubleClick_1(object sender, DataGridViewCellEventArgs e)
Cadastro.ShowDialog();
//And here is where I show Form2
private void funcaoDataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
Config.ShowDialog();
}// And the code keeps on going}
And this is a snippet from Form3:
public partial class Form3 : Form
public Form3()
InitializeComponent();
private void Form3_Load(object sender, EventArgs e)
this.projetoTableAdapter.Fill(this.database1DataSet.Projeto);
this.modulosTableAdapter.Fill(this.database1DataSet.Modulos);
private void btnOK_Click(object sender, EventArgs e)
if (projetoTextBox.Text == "")
MessageBox.Show("some text here");
else
////// HERE IS THE PLACE WHERE I WANT TO CALL THE METHOD! "salva_banco()"
I've read lots of suggestions but none satisfied my condition.
I appreciate any help.
Thanks.

You need to find the instance of the PRINCIPAL form to call the method on. If you know there will always be exactly one open you can use:
var principalForm = Application.OpenForms.OfType<PRINCIPAL>().Single();
principalForm.salva_banco();
David
David http://blogs.msdn.com/b/dbrowne/

WebDynpro Method from a Class Interface?

Is possible to call a webdynpro method from a class interface that is register in the WDDOINIT of the same WEBDYNPRO component?
I register my custom webdynpro screen into FPM_OIF_COMPONENT, now when I execute a FPM action my WebDynpro receives the action but ofcourse WDDOINIT doesn't get triggered again. I need to call my webdynpro code in the class interface so I can update my custom screen.
SAP does that in their standard screen, Can I do that?
Jason PV

As Matt pointed out, your questions indicate that you should start from the basics, then as your knowledge enlarges, go and familarize with more advanced concepts of ABAP Objects. Once you feel a bit comfortable with that, go for BADIs and read a bit about that too.
In my opinion the best start is to read some book, which covers most of ABAP OO concepts. Personally I would recommend [ABAP Objects: ABAP Programming in SAP NetWeaver|http://www.sap-press.com/product.cfm?account=&product=H1934] as I like this author and had his previous book. This would give you strong foundations of what is going on here. Eventually you will often want to refresh some concepts so you have everything you need in one spot (book).
Of course if want to save some money, simply look for articles/blogs/wikis in SDN or search in Google. There are plenty of these.
For start I suggest these series of videoblogs [Basic ABAP OO eLearnings|http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=(J2EE3414800)ID1160600550DB10016261778120999663End?blog=/pub/wlg/15408]
This will give you rough idea how the OO design should be done.
Regards
Marcin

Use methods of another class

Dear Sir/madam,
i have a question about using methods of another class. I will explane:
i have made a class which is called A. This class has some attributes (studentName and examRank) and some methods.
Now i need to made another class called B. Now i want to make an array where i can add some attributes of objects which i made of class A. How can i do that?
Kind regards

Here's a for-instance that doesn't use your exact program but demonstrates the point:
public class A
int value;
String name;
public A(int value, String name)
    this.name = name;
    this.value = value;
public int getValue()
    return value;
public String getName()
    return name;
public String toString()
    return name + ": " + value;
import java.util.Arrays;
import java.util.Random;
public class B
private static final String[] NAMES =
    "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
private static final int MAX = 100;
private A[] myAs = new A[NAMES.length];
private Random random = new Random();
public B()
    for (int i = 0; i < myAs.length; i++)
      myAs[i] = new A(random.nextInt(MAX), NAMES);
public String toString()
return Arrays.toString(myAs);
public int getTotal()
int temp = 0;
for (int i = 0; i < myAs.length; i++)
temp += myAs[i].getValue();
return temp;
public static void main(String[] args)
B b = new B();
System.out.println(b);
System.out.println("Total: " + b.getTotal());

Use method from father class for event

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