Can anyone help me, please

Question

Hello again:
Please run my coding first, and get some view from my coding.
I want to add a table(it is from TableRenderDemo) to a JFrame when I click on the button(from DrawCalendar) of the numer 20, and I want the table disply under the buttons(from DrawCalendar), and the table & buttons all appear on the frame. I added some code for this problem(in the EventHander of the DrawCalendar class), but I do
not known why it can not work.Please help me to solve this problem.
Can anyone help me, please.
Thanks.
*This program for add some buttons to JPanel
*and add listeners to each button
*I want to display myTable under the buttons,
*when I click on number 20, but why it doesn't
*work, The coding for these part are indicated by ??????????????
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.GridLayout;
public class DrawCalendar extends JPanel {
     private static DrawCalendar dC;
     private static TestMain tM;
     private static TableRenderDemo myTable;
     private static GridLayout gL;
     private static final int nlen = 35;
    private static String names[] = new String[nlen];
    private static JButton buttons[] = new JButton[nlen];
     public DrawCalendar(){
          gL=new GridLayout(5,7,0,0);
           setLayout(gL);
           assignValues();
           addJButton();
           registerListener();
    //assign values to each button
       private void assignValues(){
          names = new String[35];
         for(int i = 0; i < names.length; i++)
            names[i] = Integer.toString(i + 1);
     //create buttons and add them to Jpanel
     private void addJButton(){
          buttons=new JButton[names.length];
          for (int i=0; i<names.length; i++){
               buttons=new JButton(names[i]);
     buttons[i].setBorder(null);
     buttons[i].setBackground(Color.white);
     buttons[i].setFont(new Font ("Palatino", 0,8));
add(buttons[i]);
//add listeners to each button
private void registerListener(){
     for(int i=0; i<35; i++)
          buttons[i].addActionListener(new EventHandler());          
//I want to display myTable under the buttons,
//when I click on number 20, but why it doesn't
//work
private class EventHandler implements ActionListener{
     public void actionPerformed(ActionEvent e){
     for(int i=0; i<35; i++){
//I want to display myTable under the buttons,
//when I click on number 20, but why it doesn't
//work
     if(i==20){  //???????????               
          tM=new TestMain(); //???????
          tM.c.removeAll(); //??????
          tM.c.add(dC); //???????
          tM.c.add(myTable); //????
          tM.validate();
     if(e.getSource()==buttons[i]){
     System.out.println("testing " + names[i]);
     break;
*This program create a table with some data
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TableRenderDemo extends JScrollPane {
private boolean DEBUG = true;
public TableRenderDemo() {
// super("TableRenderDemo");
MyTableModel myModel = new MyTableModel();
JTable table = new JTable(myModel);
table.setPreferredScrollableViewportSize(new Dimension(700, 70));//500,70
//Create the scroll pane and add the table to it.
setViewportView(table);
//Set up column sizes.
initColumnSizes(table, myModel);
//Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table.getColumnModel().getColumn(2));
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
private void initColumnSizes(JTable table, MyTableModel model) {
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);
try {
comp = column.getHeaderRenderer().
getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;
} catch (NullPointerException e) {
System.err.println("Null pointer exception!");
System.err.println(" getHeaderRenderer returns null in 1.3.");
System.err.println(" The replacement is getDefaultRenderer.");
comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;
if (DEBUG) {
System.out.println("Initializing width of column "
+ i + ". "
+ "headerWidth = " + headerWidth
+ "; cellWidth = " + cellWidth);
//XXX: Before Swing 1.1 Beta 2, use setMinWidth instead.
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
public void setUpSportColumn(TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Chasing toddlers");
comboBox.addItem("Speed reading");
comboBox.addItem("Teaching high school");
comboBox.addItem("None");
sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(renderer);
//Set up tool tip for the sport column header.
TableCellRenderer headerRenderer = sportColumn.getHeaderRenderer();
if (headerRenderer instanceof DefaultTableCellRenderer) {
((DefaultTableCellRenderer)headerRenderer).setToolTipText(
"Click the sport to see a list of choices");
class MyTableModel extends AbstractTableModel {
final String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
final Object[][] data = {
{"Mary ", "Campione",
"Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Chasing toddlers", new Integer(2), new Boolean(false)},
{"Sharon", "Zakhour",
"Speed reading", new Integer(20), new Boolean(true)},
{"Angela", "Lih",
"Teaching high school", new Integer(4), new Boolean(false)}
public final Object[] longValues = {"Angela", "Andrews",
"Teaching high school",
new Integer(20), Boolean.TRUE};
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return data.length;
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
return data[row][col];
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
* Don't need to implement this method unless your table's
* data can change.
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
if (data[0][col] instanceof Integer
&& !(value instanceof Integer)) {
//With JFC/Swing 1.1 and JDK 1.2, we need to create
//an Integer from the value; otherwise, the column
//switches to contain Strings. Starting with v 1.3,
//the table automatically converts value to an Integer,
//so you only need the code in the 'else' part of this
//'if' block.
try {
data[row][col] = new Integer(value.toString());
fireTableCellUpdated(row, col);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(TableRenderDemo.this,
"The \"" + getColumnName(col)
+ "\" column accepts only integer values.");
} else {
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
System.out.println();
System.out.println("--------------------------");
*This program for add some buttons and a table on JFrame
import java.awt.*;
import javax.swing.*;
public class TestMain extends JFrame{
private static TableRenderDemo tRD;
     private static TestMain tM;
protected static Container c;
private static DrawCalendar dC;
     public static void main(String[] args){
     tM = new TestMain();
     tM.setVisible(true);
     public TestMain(){
     super(" Test");
     setSize(800,600);
//set up layoutManager
c=getContentPane();
c.setLayout ( new GridLayout(3,1));
tRD=new TableRenderDemo();
dC=new DrawCalendar();
addItems();//add Buttons to JFrame
private void addItems(){
     c.add(dC); //add Buttons to JFrame
     //c.add(tRD); //add Table to JFrame     

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