Panel adding Components

Question

Hi all,
I have a problem here with Java swing. I tried to create a JPanel and add all the components in to it like Label, JRadioButton,JCheckBox, etc., and finally adding them in to a container which gets the content pane and display it. The problem here is the panel is adding the Label properly but not the other JComponents. I have tested it by adding some more JComponents and non-JComponents and those with nonJs are added properly and displays only those components.
Model Code:
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
JPanel secPanel = new JPanel();
secPanel.setLayout(new BoxLayout(secPanel,BoxLayout.Y_AXIS));
Label lbl = new Label("Heading");
secPanel.add(lbl);
secPanel.add(new JCheckBox("Choice 1");
secPanel.add(new JRadioButton("choice 2");
cp.add(secPanel);Further, I have also tested by creating a new JApplet and same as above, I did the panel and added JComponents in to that and it seems to work fine there.
Completely, bizarre for me!!!
Can anybody shed their views you have here?
Thanks,
Shivaram.

Answer 1

Sure. I now removed all the nonJComponents and pasted down the code
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class TestSwingCheck02 extends JApplet implements ItemListener{
    String order;
    int numSections=0;
    String[] alpha = { "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V",
            "W","X","Y","Z"};
            int score = 0; //default value
            int ansSetID = 0;
            boolean validParams = true;
            Vector panelVector;
            Vector choiceVector;
            Vector labelVector;
            Vector boxGroupVector;
            Vector correctAnswers;
            Vector sectionScores;
            Vector ansSets;
            String itemSelected=""; //for debugging
            String errorMessage="";
            boolean shuffle;
            Container mainPanel;
            /** Initialization method that will be called after the applet is loaded
             *  into the browser.
            public void init() {
                try {
                    javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
                        public void run() {
                            createGUI();
                } catch (Exception e) {
                    System.err.println("createGUI didn't successfully complete");
            private void createGUI() {
                // TODO start asynchronous download of heavy resources
                panelVector = new Vector();
                choiceVector = new Vector();
                labelVector = new Vector();
                boxGroupVector = new Vector();
                correctAnswers = new Vector();
                sectionScores = new Vector();
                shuffle = false;
                mainPanel = getContentPane();
                order = this.getParameter("order_type");
                numSections = Integer.parseInt(this.getParameter("num_sections"));
                if(order.equalsIgnoreCase("C")){
                    mainPanel.setLayout(new FlowLayout());
                }else if(order.equalsIgnoreCase("R")){
                    mainPanel.setLayout(new FlowLayout());
                }else{
                    errorMessage = "Order type '"+order+"' is not recognised. Please specify either 'R' for rowwise layout or 'C' for columnwise layout.";
                if(!(order.equalsIgnoreCase("C") || order.equalsIgnoreCase("R"))){
                    validParams = false;
                    score = -99;
                if(validParams){
                    for(int i=0; i<numSections; i++){
                        Box secPanel = new Box(BoxLayout.Y_AXIS);
                        String sectionPart = "sec"+alpha;
String heading = this.getParameter(sectionPart+"_head");
String secType = this.getParameter(sectionPart+"_type");
int totalChoices = Integer.parseInt(this.getParameter(sectionPart+"_choicenum"));
String choiceList = this.getParameter(sectionPart+"_choices");
String correctAns = this.getParameter(sectionPart+"_correct");
String sShuffle = this.getParameter(sectionPart+"_shuffle");
String secScore = this.getParameter(sectionPart+"_score");
ansSets = new Vector();
boolean hasMultipleAnswers = false;
if(ansSets.size()==0){
if(this.getParameter("answer_set") != null){
ansSets.add(this.getParameter("answer_set"));
}else if(this.getParameter("answer_set1") != null){
for(int q=1;q<=100;q++){
if(this.getParameter("answer_set"+q) != null){
ansSets.add(this.getParameter("answer_set"+q));
}else{
break;
if(sShuffle != null){
shuffle = Boolean.parseBoolean(sShuffle);
if(correctAns != null){
correctAnswers.add(correctAns);
sectionScores.add(secScore);
String[] choices = null;
if(choiceList != null){
if(!choiceList.equals("")){
choices = this.splitChoiceList(choiceList);
if(choices.length != totalChoices){
errorMessage = "Choicenum value doesnot match with the total number of choices in "+sectionPart;
if(order.equalsIgnoreCase("C")){
}else if(order.equalsIgnoreCase("R")){
if(secType.equalsIgnoreCase("chk")){
hasMultipleAnswers = true;
}else if(secType.equalsIgnoreCase("rdo")){
Font fnt = new Font("Monospaced",Font.BOLD,14);
JLabel lbl = new JLabel(heading);
lbl.setFont(fnt);
labelVector.add(lbl);
secPanel.add((JLabel)labelVector.get(i));
secPanel.add(new JLabel("Check label"));
secPanel.add(new JRadioButton("Check1"));
Vector tempChoice = new Vector();
for(int j=0; j<choices.length; j++){
if(hasMultipleAnswers) {
tempChoice.add(new JCheckBox(choices[j]));
}else{
tempChoice.add(new JRadioButton(choices[j]));
secPanel.add(new JRadioButton("Check2"));
if(shuffle){
Vector afterShuffle = this.shuffleChoices(tempChoice);
for(int j=0; j<afterShuffle.size(); j++){
if(hasMultipleAnswers){
JCheckBox chkBox = (JCheckBox)afterShuffle.get(j);
chkBox.setVisible(true);
chkBox.setEnabled(true);
chkBox.addItemListener(this);
secPanel.add(chkBox);
}else{
JRadioButton rdoBtn = (JRadioButton)afterShuffle.get(j);
rdoBtn.setVisible(true);
rdoBtn.setEnabled(true);
rdoBtn.addItemListener(this);
secPanel.add(rdoBtn);
choiceVector.add(tempChoice);
}else{
for(int j=0; j<tempChoice.size();j++){
if(hasMultipleAnswers){
JCheckBox chkBox = (JCheckBox)tempChoice.get(j);
chkBox.setVisible(true);
chkBox.setEnabled(true);
chkBox.addItemListener(this);
secPanel.add(chkBox);
}else{
JRadioButton rdoBtn = (JRadioButton)tempChoice.get(j);
rdoBtn.setVisible(true);
rdoBtn.setEnabled(true);
rdoBtn.addItemListener(this);
secPanel.add(rdoBtn);
choiceVector.add(tempChoice);
//secPanel.setVisible(true);
secPanel.setBackground(Color.YELLOW);
mainPanel.add(secPanel, BorderLayout.NORTH);
mainPanel.setVisible(true);
public void itemStateChanged(ItemEvent ie){
public void paint(Graphics g){
Thanks,
Shivaram.