Update Jcombobox 's label in render

Question

hi ,everybody, i have a problem about combobox, any body can help me!
thank you!
I want to have a combobox with checkbox as item, I rewrite a render writen by ice, because the combobox has three state, when I click diferent checkbox in this combobox , the label of combobox will update rightly, but if I click one checkbox to change the checkbox state ,the label will no update , it seem that when I click one checkbox many times .the menthod
getListCellRendererComponent(JList list, Object value, int index,
                    boolean isSelected, boolean cellHasFocus)
will no update label
my code :
mainclass:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Iterator;
import java.util.Vector;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.plaf.basic.BasicComboBoxEditor;
public class mainclass {
      public static void main(String[] args) {
             final testbox myComboBox = new testbox();
             myComboBox.addItem("SelectAll");
             myComboBox.addItem("ClearAll");
             myComboBox.addItem("GrayedAll");
             for(int i = 0; i < 5; i++) {
                 myComboBox.addItem("Item " + i);
             JFrame frame = new JFrame("My ComboBox");
             frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
             frame.setSize(150, 60);
             frame.setLocation(300, 300);
             //frame.setJMenuBar( menubar );
             JPanel panel=new JPanel();
             panel.setLayout(new BorderLayout());
             panel.add(myComboBox,BorderLayout.NORTH);        
             frame.getContentPane().add(panel);
             frame.setVisible(true);
             final IconedCellRendererField renderer = IconedCellRendererField.getCheckBoxRendererInstance();
             myComboBox.setRenderer(renderer);
             myComboBox.addActionListener(new ActionListener()
                 public void actionPerformed(ActionEvent e)
                      if(myComboBox.getSelectedItem().toString().equals("SelectAll")){
                           renderer.selectAll(true);                         
                      if(myComboBox.getSelectedItem().toString().equals("ClearAll")){
                           renderer.clearAll(true);
                      if(myComboBox.getSelectedItem().toString().equals("GrayedAll")){
                           renderer.grayedAll(true);
}renderer:
import java.awt.*;
import java.awt.event.*;
//import java.io.*;
//import java.net.*;
import java.util.*;
import javax.swing.*;
//import javax.swing.event.*;
import javax.swing.border.*;
//import javax.swing.table.*;
public class IconedCellRendererField extends DefaultListCellRenderer implements MouseListener {
     public Icon icon, selIcon;
     Icon[] icons = null;
     public boolean useIconBackground = true, useIndexSensitiveIcons = false,
               useCheckBoxAsIcon = false, useLinkState = false;
     Dimension labelDim = null;
     public JLabel iconLabel;
     public JCheckBox box = null;
     public JPanel noback;
     public SelectionStateHandler selStateHandler = null;     
     private JList theList = null;
     public boolean[] selState = null, enableState = null;
     int offset = 5;
     Rectangle rect = null;
     int currentLinkRow = -1;
     boolean isOnRow = false, paintDivider = false;
     private Icon dividerImage = null;     
     private Color linkColor = Color.blue, hoverColor = Color.red, selectedLinkColor = Color.green;
     /* Initialises the renderer with one icon that is displayed without the
      * cell background.
     public IconedCellRendererField(Icon icon) {
          this(icon,false);
     /* Initialises the renderer with two icons that provide a switch capability
      * when a row is selected/deselected
     public IconedCellRendererField(Icon icon, Icon selIcon) {
          this.icon = icon;
          this.selIcon = selIcon;
          //addMouseListener(this);
     /* Initialises the renderer with two icons that provide a switch capability
      * when a row is selected/deselected. The boolean argument enables the icon
      * to either use the renderer background or appear transparent.
     public IconedCellRendererField(Icon icon, Icon selIcon, boolean useIconBackground) {
          this(icon, selIcon);
          setIconHasBackground(useIconBackground);
          createNoBackgroundPanel();
     /* Initialises the renderer with a single no siwthing icon. The boolean
      * argument enables the icon to either use the renderer background
      * or appear transparent.
     public IconedCellRendererField(Icon icon, boolean useIconBackground) {
          this(icon, icon, useIconBackground);
     /* Initialises the renderer to load two icons from the provided image locations.
      * This enables icon switching on selection.
     public IconedCellRendererField(String iconLoc, String selIconLoc) {
          icon = new ImageIcon(iconLoc);
          selIcon = new ImageIcon(selIconLoc);
          //addMouseListener(this);
     /* Initialises the renderer to load a single icon from the provided image location.
      * The icon can either have the renderer background or not based on the
      * boolean property.
     public IconedCellRendererField(String iconLoc, boolean iconBackground) {
          this(iconLoc, iconLoc, iconBackground);
     /* Initialises the renderer to load two icons from the provided image locations.
      * This enables icon switching on selection. The icon can either have the renderer
      * background or not based on the boolean property.
     public IconedCellRendererField(String iconLoc, String selIconLoc, boolean iconBackground) {
          this(iconLoc, selIconLoc);
          setIconHasBackground(iconBackground);
          createNoBackgroundPanel();
     /* Initialises the renderer to load a single icon from the provided image location.
     public IconedCellRendererField(String iconLoc) {
          this(iconLoc, true);
     /* Initialises the renderer with an array of image icons that are repeated for
      * each row in the list.
     public IconedCellRendererField(Icon[] icons, boolean useIconBackground) {
          this(icons[0], icons[0], useIconBackground);
     public void createNoBackgroundPanel() {
          iconLabel = new JLabel((Icon)null, JLabel.CENTER);
          if(labelDim != null) {      iconLabel.setPreferredSize(labelDim); }
          iconLabel.setBorder( new EmptyBorder(1,5,1,5) );
          noback = new JPanel( new BorderLayout() ) {
              * Overridden for performance reasons.
              * See the <a href="#override">Implementation Note</a>
              * for more information.
              //public void validate() {}
             // public void invalidate() {}          
              public void repaint() {}
              //public void revalidate() {}
              public void repaint(long tm, int x, int y, int width, int height) {}
              public void repaint(Rectangle r) {}
              protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
                    // Strings get interned...
                    if (propertyName == "text"
                               || ((propertyName == "font" || propertyName == "foreground")
                                   && oldValue != newValue)) {
                        super.firePropertyChange(propertyName, oldValue, newValue);
              public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {}
              public void firePropertyChange(String propertyName, char oldValue, char newValue) {}
              public void firePropertyChange(String propertyName, short oldValue, short newValue) {}
              public void firePropertyChange(String propertyName, int oldValue, int newValue) {}
              public void firePropertyChange(String propertyName, long oldValue, long newValue) {}
              public void firePropertyChange(String propertyName, float oldValue, float newValue) {}
              public void firePropertyChange(String propertyName, double oldValue, double newValue) {}
              public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
          if(useCheckBoxAsIcon()) {
               box = new JCheckBox();
               //box.addMouseListener(this);
               box.setOpaque(false);
               noback.add( box, BorderLayout.WEST );
               //noback.addMouseListener(this);
               rect = box.getBounds();
               //list.addMouseListener(this);
          } else {
               noback.add( iconLabel, BorderLayout.WEST );
          noback.add( this, BorderLayout.CENTER );
          noback.setBorder( new EmptyBorder(1,1,1,1) );
          noback.setOpaque(false);
     public Component getListCellRendererComponent(JList list, Object value, int index,
                    boolean isSelected, boolean cellHasFocus) {
          System.out.println(value+"+"+index+"+"+isSelected+"+"+cellHasFocus);
          if(theList == null || theList != list) {
               theList = list;
               if(useLinkState) {
                    attachLinkSimulationListener();
          setOpaque(true);
          setText( value == null ? "" : value.toString());
          if(useIndexSensitiveIcons) {
               icon = getIcon(index);
          if(useIconBackground)
               setIcon(icon);          
          setFont( list.getFont() );
          setToolTipText(value.toString() );
          if(list.isEnabled())
               setEnabled( isEnabled(index) );
          else
               setEnabled( list.isEnabled() );
          if(isSelected && isEnabled(index) ) {
               setForeground( Color.black );
               setBackground( new Color(223, 235, 245) );
               if(useIndexSensitiveIcons) {
                    selIcon = getIcon(index);
               if(useIconBackground)
                    setIcon(selIcon);
          } else {
               setForeground(Color.black);
               setBackground(Color.white);
               setBorder(null);
          if(cellHasFocus) {
               setBorder( new CompoundBorder( new LineBorder( new Color(150, 150, 220) ),
                                                  new EmptyBorder(2,2,2,2)  ) );
          } else {
               setBorder( new EmptyBorder(2,2,2,2));
          if(useLinkState) {
               if(currentLinkRow == index) {
                    setText("<html><u>" + value.toString()+"</u></html>" );     
                    setForeground( getHoverLinkColor() );               
               } else {
                    setForeground( getLinkColor() );
               if(isSelected) {
                    setForeground( getSelectedLinkColor() );
               setBackground(Color.white);
               setBorder( new EmptyBorder(1,1,1,1) );
          if( shdPaintDivider() ) {
               Border border = null;
               if(dividerImage != null) {
                    border = new MatteBorder(0,0,1,0, dividerImage);
               } else {
                    border = new MatteBorder(0,0,1,0, getLinkColor() );
               if(index < theList.getModel().getSize() - 1 ) {
                    setBorder( new CompoundBorder(getBorder(),border) );
               } else {
                    setBorder( new EmptyBorder(1,1,1,1) );
          if(useIconBackground == false) {
              if(isSelected)
                  iconLabel.setIcon(selIcon);
              else
                  iconLabel.setIcon(icon);
              if(useCheckBoxAsIcon()) {
                  if(selState == null) {
                      updateSelectionStateTrackers(list);
                  if(selStateHandler == null) {
                      list.addMouseListener( selStateHandler = new SelectionStateHandler(list) );
                  try {
                      box.setSelected( selState[index] );
                  } catch(Exception e) {}
              if( shdPaintDivider() ) {              
                  //if(index < theList.getModel().getSize() - 1 ) {
                      noback.setBorder( getBorder() );
                      setBorder( new EmptyBorder(1,1,1,1) );
                  //} else {
                  //  noback.get
              // this should cause a JComboBox to paint the Label instead of the
              // check box + label combination
              if(index == -1) {
                   Vector<Object> v=new Vector<Object>();
                   v=getSelectedObjects();
                    String val=generateString();
                   JLabel label=new JLabel(val);                    
                  if(iconLabel.getIcon() != null) {
                       label.setIcon( iconLabel.getIcon() );
                  System.out.println("label");
                  return label;
              return noback;
          return this;
     public String generateString()
          String val = "";
          if(selState[0]==true&&selState[1]==false&&selState[2]==false){
                for(int i = 3; i < theList.getModel().getSize(); i++) {
                       String curString=theList.getModel().getElementAt(i).toString();
                       if(val.length()==0){
                              val=val+curString+"-1";
                       } else {                              
                              val=val+"&"+curString+"-1";
           //clear all     
           if(selState[1]==true&&selState[0]==false&&selState[2]==false ){                                   
                  for(int i = 3; i < theList.getModel().getSize(); i++) {
                       String curString=theList.getModel().getElementAt(i).toString();
                       if(val.length()==0){
                              val=val+curString+"-0";
                       } else {                              
                              val=val+"&"+curString+"-0";
          //grayedall
           if(selState[2]==true&&selState[0]==false&&selState[1]==false ){                                   
                  val="";                      
           if(selState[0]==false&&selState[1]==false&&selState[2]==false ){
                for(int i = 3; i < theList.getModel().getSize(); i++) {
                       String curString=theList.getModel().getElementAt(i).toString();
                       if(selState==true&&enableState[i]==false){
                         continue;
                    if(selState[i]==true&&enableState[i]==true){
                         if(val.length()==0){
                                   val=val+curString+"-1";
                         } else {                              
                                   val=val+"&"+curString+"-1";
                    if(selState[i]==false&&enableState[i]==true){
                         if(val.length()==0){
                                   val=val+curString+"-0";
                         } else {                              
                                   val=val+"&"+curString+"-0";
          return val;
     public void updateSelectionStateTrackers(JList list) {
          selState = new boolean[ list.getModel().getSize() ];
          enableState = new boolean[ list.getModel().getSize() ];
          for(int i = 0; i < selState.length; i++) {
               selState[i] = false;
               enableState[i] = true;
     public int[] getSelectedIndices() {
          if(!useCheckBoxAsIcon()) {
               return new int[0];
          int length = 0;
          if(selState==null){
               return null;
          for(int i = 0; i < selState.length; i++) {
               if(selState[i]) {
                    length++;
          int[] indices = new int[length];
          for(int i = 0, n = 0; i < selState.length; i++) {
               if(selState[i]) {
                    indices[n++] = i;
          //System.out.println("Selected Indices.length = " + indices.length);
          return indices;
     public Vector<Object> getSelectedObjects() {
          int[] indices = getSelectedIndices();
          Vector<Object> objects = new Vector<Object>();
          if(indices==null){
               return null;
          for(int i = 0; i < indices.length; i++) {
               objects.addElement( theList.getModel().getElementAt(indices[i]) );
          return objects;
     public void setIconHasBackground(boolean b) {
          useIconBackground = b;
     public Icon[] getIcons() {
          return icons;
     public Icon getIcon(int index) {
          if(icons != null && icons.length == 0) {
               return icon;
          if(icons != null && index > icons.length) {
               index = index - (icons.length - 1);
          return icons[index];
     public void setIcons(Icon[] icons) {
          if(icons != null) {
               useIndexSensitiveIcons = true;
          this.icons = icons;
     public void setIcon(Icon icon, int index) {
          if(icons != null && icons.length > 0) {
               icons[index] = icon;
     public void setIconLabelDimension(Dimension dim) {
          labelDim = dim;
     public static IconedCellRendererField getCheckBoxRendererInstance() {
          IconedCellRendererField cr = new IconedCellRendererField(new EmptyIcon());
               cr.setUseCheckBoxAsIcon(true);
          return cr;
     public void setUseCheckBoxAsIcon(boolean use) {
          useCheckBoxAsIcon = use;
          createNoBackgroundPanel();
     public boolean useCheckBoxAsIcon() {
          return useCheckBoxAsIcon;
     public void paintComponent(Graphics g) {
          super.paintComponent(g);
     public void setDisplayItemsAsLinks(boolean use) {
          useLinkState = use;
     public void setLinkColor(Color color) {
          linkColor = color;
          if(theList != null) {
               theList.repaint();
     public Color getLinkColor() {
          return linkColor;
     public void setHoverLinkColor(Color color) {
          hoverColor = color;
          if(theList != null) {
               theList.repaint();
     public Color getHoverLinkColor() {
          return hoverColor;
     public void setSelectedLinkColor(Color color) {
          selectedLinkColor = color;
          if(theList != null) {
               theList.repaint();
     public Color getSelectedLinkColor() {
          return selectedLinkColor;
     public void attachLinkSimulationListener() {
          theList.setCursor( Cursor.getPredefinedCursor(Cursor.HAND_CURSOR) );
          theList.addMouseListener( new MouseAdapter() {
               public void mouseEntered(MouseEvent e) {
                    isOnRow = true;                    
               public void mouseExited(MouseEvent e) {
                    isOnRow = false;
currentLinkRow = -1;
theList.repaint();
          theList.addMouseMotionListener( new MouseMotionAdapter() {
               public void mouseMoved(MouseEvent e) {
isOnRow = true;
currentLinkRow = theList.locationToIndex( e.getPoint() );
theList.repaint();
          /*table.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
isOnRow = false;
currentHighlightRow = -1;
table.repaint();
table.addMouseMotionListener( new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
isOnRow = true;
currentHighlightRow = table.rowAtPoint( e.getPoint() );
table.repaint();
     public boolean shdPaintDivider() {
          return paintDivider;
     public void setPaintDivider(boolean paintDivider) {
          this.paintDivider = paintDivider;
     public void setDividerImage(Icon icon) {
          this.dividerImage = icon;
          setPaintDivider(true);
     private void dispatchEvent(MouseEvent me) {
if(rect != null && box != null && rect.contains(me.getX(), me.getY())){
Point pt = me.getPoint();
pt.translate(0,0);
box.setBounds(rect);
box.dispatchEvent(new MouseEvent(box, me.getID()
, me.getWhen(), me.getModifiers()
, pt.x, pt.y, me.getClickCount()
, me.isPopupTrigger(), me.getButton()));
if(!box.isValid()) {
     repaint();
     System.out.println("Dispatch Event: Box.invalid called");
System.out.println("Dispatch Event called");
} else {
     System.out.println("Dispatch Event Called, rect null");
public void mouseClicked(MouseEvent me){
dispatchEvent(me);
public void mouseEntered(MouseEvent me){
dispatchEvent(me);
public void mouseExited(MouseEvent me){
dispatchEvent(me);
public void mousePressed(MouseEvent me){
dispatchEvent(me);
public void mouseReleased(MouseEvent me){
dispatchEvent(me);
public class SelectionStateHandler extends MouseAdapter {
     JList list = null;
     public SelectionStateHandler(JList list) {
          this.list = list;
     public void mouseClicked(MouseEvent e)
          * Handles the checkbox selection process. Uses the bounds property of the
          * check box within the selected cell to determine whether the checkbox should
          * be selected or not
          public void mouseReleased(MouseEvent e) {
               /*if(list == null || list.getSelectedIndex() == -1
     || !isEnabled( list.locationToIndex(e.getPoint()) ) ) {
     return;
          if(list == null || list.getSelectedIndex() == -1){
               return;
     int[] indices = list.getSelectedIndices();
     // get the current relative position of the check box
     //rect = box.getBounds(rect);
     for(int i = 0; i < indices.length; i++) {
     // get the current relative position of the check box
     int loc = list.locationToIndex( e.getPoint() );
     rect = list.getCellBounds(loc,loc);
     // ensure the point clicked in within the checkBox
     if(e.getX() < (rect.getX() + 20) ) {
          Object obj=list.getModel().getElementAt(i);
          //if(!obj.equals("SelectAll")&&!obj.equals("ClearAll")&&!obj.equals("GrayedAll")){
               if(indices[i]>2){
                    selState[0]=false;
                    selState[1]=false;
                    selState[2]=false;
                    //����
                    if(!this.isEnabled(indices[i])&&selState[indices[i]]==true){
                         this.setEnabled(indices[i],true);
                         selState[indices[i]]=false;
                    } else if(this.isEnabled(indices[i])&&selState[indices[i]]==true){
                         //����
                         selState[indices[i]]=true;
                         this.setEnabled(indices[i],false);                              
                    }else if(this.isEnabled(indices[i])&&selState[indices[i]]==false){
                         //����
                         selState[indices[i]]=true;
                         this.setEnabled(indices[i],true);
               } else {
                    selState[indices[i]] = !selState[indices[i]];
     list.revalidate();
     list.repaint();
     public void selectAll(boolean b) {
          for(int i = 0; i < list.getModel().getSize(); i++) {
               try {
                    this.enableAll(true);
                    Object obj=list.getModel().getElementAt(i);
                    if(!obj.equals("ClearAll")&&!obj.equals("GrayedAll")){
                         selState[i] = b;
                    } else{
                         selState[i]=!b;
                    selState[0]=false;
               } catch(ArrayIndexOutOfBoundsException aie) {
                    updateSelectionStateTrackers(list);
                    selectAll(b);
                    return;
          if(list != null) {
               list.revalidate();
               list.repaint();
     public void clearAll(boolean b){
          for(int i = 0; i < list.getModel().getSize(); i++) {
               try {
                    Object obj=list.getModel().getElementAt(i);
                    this.enableAll(true);
                    if(!obj.equals("ClearAll")){
                         selState[i] = !b;
                    } else{
                         selState[i]=b;
                    selState[1]=false;
               } catch(ArrayIndexOutOfBoundsException aie) {
                    updateSelectionStateTrackers(list);
                    selectAll(b);
                    return;
          if(list != null) {
               list.revalidate();
               list.repaint();
     public void grayedAll(boolean b){
          for(int i = 0; i < list.getModel().getSize(); i++) {
               try {
                    Object obj=list.getModel().getElementAt(i);
                    if(!obj.equals("SelectAll")&&!obj.equals("ClearAll")){
                         if(i==2){
                              selState[i] = !b;
                         }else{                             
                              selState[i] = b;
                         this.setEnabled(i,false);
                    } else{
                         selState[i]=!b;                          
               } catch(ArrayIndexOutOfBoundsException aie) {
                    updateSelectionStateTrackers(list);
                    selectAll(b);
                    return;
          if(list != null) {
               list.revalidate();
               list.repaint();
     public void setSelectedIndex(int index) {
          for(int i = 0; i < list.getModel().getSize(); i++) {
               selState[i] = false;
          selectIndex(index);
     public void selectIndex(int index) {
          try {
               selState[index] = true;
          } catch(ArrayIndexOutOfBoundsException aie) {
               updateSelectionStateTrackers(list);
               selectIndex(index);
               return;
          if(list != null) {
               list.revalidate();
               list.repaint();
     public void setEnabled(int index, boolean b) {
          try {
               enableState[index] = b;
          } catch(ArrayIndexOutOfBoundsException aie) {
               updateSelectionStateTrackers(list);
               setEnabled(index, b);
     public boolean isEnabled(int index) {
          if(index == -1) {
               return true;
          boolean isEnabled = true;
          try {
               isEnabled = enableState[index];
          } catch(ArrayIndexOutOfBoundsException aie) {
               updateSelectionStateTrackers(list);
               return isEnabled(index);
          return isEnabled;
     public void enableAll(boolean b) {
          for(int i = 0; i < enableState.length; i++) {
               enableState[i] = b;
public void selectAll(boolean b) {
     if(selStateHandler == null) {
          return;
     selStateHandler.selectAll(b);
public void clearAll(boolean b){
     if(selStateHandler == null) {
          return;
     selStateHandler.clearAll(b);
public void grayedAll(boolean b){
     if(selStateHandler == null) {
          return;
     selStateHandler.grayedAll(b);
public void setSelectedIndex(int index) {
     if(selStateHandler == null) {
          return;
     selStateHandler.setSelectedIndex(index);
public void selectIndex(int index) {
     if(selStateHandler == null) {
          return;
     selStateHandler.selectIndex(index);
public void enableAll(boolean b) {
     if(selStateHandler == null) {
          return;
     selStateHandler.enableAll(b);
public void setEnabled(int index, boolean enable) {
     if(selStateHandler == null) {
          return;
     selStateHandler.setEnabled(index, enable);
public boolean isEnabled(int index) {
     if(selStateHandler == null) {
          return true;
     return selStateHandler.isEnabled(index);
public boolean isEnabledAll() {
     if(enableState == null) return true;
     for(int i = 0; i < enableState.length; i++) {
          if(!isEnabled(i)) {
               return false;
     return true;
// EmptyIcon implementation
public static class EmptyIcon implements Icon {
     int width = 16, height = 16;
     public EmptyIcon() {
     setSize(16,16);
     public EmptyIcon(int width, int height) {
     setSize(width, height);
     public void setSize(int width, int height) {
     this.width = width;
     this.height = height;
     public int getIconWidth() {  return width; }
     public int getIconHeight() { return height; }
     public void paintIcon(Component c, Graphics g, int x, int y) {}
public int getItemCount(){
     if(theList!=null){
          return theList.getModel().getSize();
     } else {
          return 0;
     public boolean[] getEnableState() {
          return enableState;
     public boolean[] getSelState() {
          return selState;
     public JList getTheList() {
          return theList;
testbox :import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JComboBox;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
public class testbox extends JComboBox
* @param args
JComboBox myComboBox;
public testbox()
myComboBox = new JComboBox();
public void setPopupVisible(boolean b)
     if(b)
          myComboBox.showPopup();
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

Answer 1

You are updating the label value when (index == -1), let change into (index<=0).
like below
// this should cause a JComboBox to paint the Label instead of the
            // check box + label combination
            if (index <= 0) {
                Vector v = new Vector();
                v = getSelectedObjects();
                String val = generateString();
                JLabel label = new JLabel(val);
                if (iconLabel.getIcon() != null) {
                    label.setIcon(iconLabel.getIcon());
                System.out.println("label");
                return label;
            }