How to add CheckBoxs to a scrollPane

Question

I have a file I�m getting user info out of and finding certain information the
User enters, I�m making a query, I�m taking the found items and making an array of Checkboxes out of them witch is working my problem is adding the Checkboxes to the scroll Pane
public class Frame1 extends JFrame{
public static Panel listan = new Panel();
JCheckBox[] jCheckBox1 ;
JScrollPane scrollPane1 = new JScrollPane(list);
//other Window objects
//first method
private void jbInit() throws Exception {
//puts all window objects together
// Constructs user screen
list.setLayout(verticalFlowLayout1);
panel1.add(scrollPane1, new XYConstraints(118, 32, 128, 195));
// i have a find buttion that takes all infoamtion out of file
// and puts in an array then finds user enterd infomation
// this is just example code that just adds CheckBoxs to the scrollPane
// and is Basically the same way the other program does
// second method
void addcheckbox_actionPerformed(ActionEvent e) {
jCheckBox1 = new JCheckBox[50];
for (int i = 0; i < 50; i++) {
String checkboxText = ("Checkbox #: " + (i + 1));
jCheckBox1[i] = new JCheckBox(checkboxText);
for (int i = 0; i < 50; i++) {
list.add(jCheckBox1, null);
My problem is that I can�t add the checkboxes at the second method but it works in the first, I can add in the first because I initialize in the second.

Answer 1

If you want something to compile here is all my example code
I will incorporate it to my 30 page program
Here is what I want my code to do
package list;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.awt.Checkbox;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2008</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
public class Frame1 extends JFrame {
  public static boolean ch=true;
  JPanel contentPane;
  GridLayout gridLayout1 = new GridLayout();
  JPanel panel1 = new JPanel();
  XYLayout xYLayout1 = new XYLayout();
  JButton jButton1;
  JButton jButton2;
  JButton addcheckbox;
  JCheckBox[] jCheckBox1 ;
  JScrollPane scrollPane1 = new JScrollPane();
  JPanel list = new JPanel();
  VerticalFlowLayout verticalFlowLayout1 = new VerticalFlowLayout();
  //Construct the frame
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    catch (Exception e) {
      e.printStackTrace();
  //Component initialization
// method one
  private void jbInit() throws Exception {
    contentPane = (JPanel)this.getContentPane();
    jButton1 = new JButton();
    jButton2 = new JButton();
    addcheckbox = new JButton();
    this.setContentPane(contentPane);
    this.setLocale(java.util.Locale.getDefault());
    this.setResizable(false);
    this.setSize(new Dimension(400, 300));
    this.setState(Frame.NORMAL);
    this.setTitle("Frame Title");
    contentPane.setOpaque(true);
    contentPane.setRequestFocusEnabled(true);
    contentPane.setLayout(gridLayout1);
    panel1.setLayout(xYLayout1);
    jButton1.setSelected(false);
    jButton1.setText("Print");
    jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));
    jButton2.setText("select all/none");
    jButton2.addActionListener(new Frame1_jButton2_actionAdapter(this));
    addcheckbox.setBorderPainted(true);
    addcheckbox.setText("add");
    addcheckbox.addActionListener(new Frame1_addcheckbox_actionAdapter(this));
    scrollPane1.setLocale(java.util.Locale.getDefault());
    list.setLayout(verticalFlowLayout1);
    contentPane.add(panel1, null);
    panel1.add(scrollPane1, new XYConstraints(118, 32, 128, 195));
    scrollPane1.getViewport().add(list, null);
    //scrollPane1.add(listan, null);
    panel1.add(jButton1, new XYConstraints(261, 92, 90, 39));
    panel1.add(jButton2,   new XYConstraints(262, 152, 108, 30));
    panel1.add(addcheckbox, new XYConstraints(25, 49, -1, 35));
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
  void jButton1_actionPerformed(ActionEvent e) {
    String checkprint = "selected:\n";
    for (int x = 0; x < jCheckBox1.length; x++) {
      if (jCheckBox1[x].isSelected()) {
         checkprint = checkprint + jCheckBox1[x].getText()+"\n";
    System.out.println(checkprint);
  void jButton2_actionPerformed(ActionEvent e) {
    for (int x = 0; x < jCheckBox1.length; x++) {
      if (ch == true) {
        jCheckBox1[x].setSelected(true);
      else{
        jCheckBox1[x].setSelected(false);
if (ch == true)
      ch=false;
    else
      ch=true;
//method two
  void addcheckbox_actionPerformed(ActionEvent e) {
    jCheckBox1 = new JCheckBox[50];
        for (int i = 0; i < 50; i++) {
          String checkboxText = ("Checkbox #: " + (i + 1));
          jCheckBox1[i] = new JCheckBox(checkboxText);
        for (int i = 0; i < 50; i++) {
         list.add(jCheckBox1, null);
class Frame1_jButton1_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_jButton1_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.jButton1_actionPerformed(e);
class Frame1_jButton2_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_jButton2_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.jButton2_actionPerformed(e);
class Frame1_addcheckbox_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_addcheckbox_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.addcheckbox_actionPerformed(e);
}doesn�t work but if I take all of method two and put it in one it workspackage list;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.awt.Checkbox;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2008</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
public class Frame1 extends JFrame {
public static boolean ch=true;
JPanel contentPane;
GridLayout gridLayout1 = new GridLayout();
JPanel panel1 = new JPanel();
XYLayout xYLayout1 = new XYLayout();
JButton jButton1;
JButton jButton2;
JButton addcheckbox;
JCheckBox[] jCheckBox1 ;
JScrollPane scrollPane1 = new JScrollPane();
JPanel list = new JPanel();
VerticalFlowLayout verticalFlowLayout1 = new VerticalFlowLayout();
//Construct the frame
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch (Exception e) {
e.printStackTrace();
//Component initialization
private void jbInit() throws Exception {
// this is the same code in method two
jCheckBox1 = new JCheckBox[50];
for (int i = 0; i < 50; i++) {
String checkboxText = ("Checkbox #: " + (i + 1));
jCheckBox1[i] = new JCheckBox(checkboxText);
for (int i = 0; i < 50; i++) {
list.add(jCheckBox1[i], null);
contentPane = (JPanel)this.getContentPane();
jButton1 = new JButton();
jButton2 = new JButton();
addcheckbox = new JButton();
this.setContentPane(contentPane);
this.setLocale(java.util.Locale.getDefault());
this.setResizable(false);
this.setSize(new Dimension(400, 300));
this.setState(Frame.NORMAL);
this.setTitle("Frame Title");
contentPane.setOpaque(true);
contentPane.setRequestFocusEnabled(true);
contentPane.setLayout(gridLayout1);
panel1.setLayout(xYLayout1);
jButton1.setSelected(false);
jButton1.setText("Print");
jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));
jButton2.setText("select all/none");
jButton2.addActionListener(new Frame1_jButton2_actionAdapter(this));
addcheckbox.setBorderPainted(true);
addcheckbox.setText("add");
addcheckbox.addActionListener(new Frame1_addcheckbox_actionAdapter(this));
scrollPane1.setLocale(java.util.Locale.getDefault());
list.setLayout(verticalFlowLayout1);
contentPane.add(panel1, null);
panel1.add(scrollPane1, new XYConstraints(118, 32, 128, 195));
scrollPane1.getViewport().add(list, null);
//scrollPane1.add(listan, null);
panel1.add(jButton1, new XYConstraints(261, 92, 90, 39));
panel1.add(jButton2, new XYConstraints(262, 152, 108, 30));
panel1.add(addcheckbox, new XYConstraints(25, 49, -1, 35));
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
void jButton1_actionPerformed(ActionEvent e) {
String checkprint = "selected:\n";
for (int x = 0; x < jCheckBox1.length; x++) {
if (jCheckBox1[x].isSelected()) {
checkprint = checkprint + jCheckBox1[x].getText()+"\n";
System.out.println(checkprint);
void jButton2_actionPerformed(ActionEvent e) {
for (int x = 0; x < jCheckBox1.length; x++) {
if (ch == true) {
jCheckBox1[x].setSelected(true);
else{
jCheckBox1[x].setSelected(false);
if (ch == true)
ch=false;
else
ch=true;
void addcheckbox_actionPerformed(ActionEvent e) {
class Frame1_jButton1_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_jButton1_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.jButton1_actionPerformed(e);
class Frame1_jButton2_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_jButton2_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.jButton2_actionPerformed(e);
class Frame1_addcheckbox_actionAdapter implements java.awt.event.ActionListener {
Frame1 adaptee;
Frame1_addcheckbox_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
public void actionPerformed(ActionEvent e) {
adaptee.addcheckbox_actionPerformed(e);
}Edited by: deme on Feb 27, 2008 6:48 AM
Edited by: deme on Feb 27, 2008 6:51 AM