Can anyone help me, please(again)

Question

Hello :
I am sorry that my massage is not clearly.
Please run my coding first, and get some view from my coding. you can see somes buttons are on the frame.
Now I want to click the number 20 of the buttons, and then I want to display a table which from the class TableRenderDemo to sit under the buttons. I added some coding for this problem in the class DrawClalendar, the coding is indicated by ??.
but it still can not see the table apear on on the frame with the buttons.
Can anyone help me to solve this problem.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     

Answer 1

I think this is what you are trying to do. Your code was not very clear so I wrote my own:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import java.text.*;
public class TableButtons extends JFrame implements ActionListener
     Component southComponent;
    public TableButtons()
          JPanel buttons = new JPanel();
          buttons.setLayout( new GridLayout(5, 7) );
          Dimension buttonSize = new Dimension(20, 20);
          for (int j = 0; j < 35; j++)
               // this is a trick to convert an integer to a string
               String label = "" + (j + 1);
               JButton button = new JButton( label );
               button.setBorder( null );
               button.setBackground( Color.white );
               button.setPreferredSize( buttonSize );
               button.addActionListener( this );
               buttons.add(button);
          getContentPane().add(buttons, BorderLayout.NORTH);
     public void actionPerformed(ActionEvent e)
          JButton button = (JButton)e.getSource();
          String command = button.getActionCommand();
          if (command.equals("20"))
               displayTable();
          else
               System.out.println("Button " + command + " pressed");
               if (southComponent != null)
                    getContentPane().remove( southComponent );
                    validate();
                    pack();
                    southComponent = null;
     private void displayTable()
        String[] columnNames = {"Student#", "Student Name", "Gender", "Grade", "Average"};
        Object[][] data =
            {new Integer(1), "Bob",   "M", "A", new Double(85.5) },
            {new Integer(2), "Carol", "F", "B", new Double(77.7) },
            {new Integer(3), "Ted",   "M", "C", new Double(66.6) },
            {new Integer(4), "Alice", "F", "D", new Double(55.5) }
        JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane= new JScrollPane( table );
        getContentPane().add(scrollPane, BorderLayout.SOUTH);
        validate();
        pack();
        southComponent = scrollPane;
    public static void main(String[] args)
        TableButtons frame = new TableButtons();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
}