Someone please help me!!!! out of my wits!!!!

Question

Hi all,
i have the following two classes. one is a table model that in herits from DefaultTableModel. i have designed the table model to show the first row with blank values except for the run column which has a checkbox. when i call the method Add_New_Row from a button click, nothing happens. i want to add a new row to the table the same as the first. Can someone please help with this.
public class Table_Class extends JTable
CsgTableModel model = new CsgTableModel();
JTable table = new JTable(model);
JScrollPane pane = new JScrollPane(table);
public Table_Class()
table.setRowHeight(25);
public JScrollPane Return_Table()
return (pane);
public void Add_New_Row() // add a new object row to the mission table
((DefaultTableModel)(table.getModel())).addRow(new Object[] {null,"","","","",new Boolean(false),""});
public class CsgTableModel extends DefaultTableModel {
final String[] columnNames = {"Name","Object Trajectory",
"Type of Sensor","Signature","Sensor Trajectory",
"Run","Status of run"};
final Object[][] data = {{"", "","","","",new Boolean(false),""}};
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
     return 1;
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 < 0) {
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 (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) {
} else {
data[row][col] = value;
fireTableCellUpdated(row, col);
thanks for any help

Answer 1

use Vectors of vectors for holding your table data, since you won't be able to increase the size of your Object[][] array when you add a new row.
Implement your table model as follows -
public class CsgTableModel extends DefaultTableModel {
final String[] columnNames = {"Name","Object Trajectory",
"Type of Sensor","Signature","Sensor Trajectory",
"Run","Status of run"};
Vector data = new Vector();
public int getColumnCount() {
return columnNames.length;
public int getRowCount() {
return data.size();
public String getColumnName(int col) {
return columnNames[col];
public Object getValueAt(int row, int col) {
Vector rowData = (vector) data.get(row);
return rowData.get(col);
public void addRow(Vector rowdata) {          
int newRowIndex = getRowCount();
data.add(rowdata);               
fireTableRowsInserted(newRowIndex, newRowIndex);
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
public boolean isCellEditable(int row, int col) {
if (col < 0) {
return false;
} else {
return true;
public void setValueAt(Object value, int row, int col) {
Vector tempData = (Vector) data.get(0);
if (tempData.get(col) instanceof Integer
&& !(value instanceof Integer)) {
Vector rowData = (Vector) data.get(row);
try {
rowData.removeElementAt(col);
rowData.add(col, new Integer(value.toString()));
fireTableCellUpdated(row, col);
} catch (NumberFormatException e) {
} else {
rowData.removeElementAt(col);
rowData.add(col, value);
fireTableCellUpdated(row, col);
your Add_New_Row() method should now look like this -
public void Add_New_Row() // add a new object row to the mission table {
Vector rowVector = new Vector();
rowVector.add("");
rowVector.add("");
rowVector.add("");
rowVector.add("");
rowVector.add("");
rowVector.add(new Boolean(false));
rowVector.add("");
model.addRow(rowVector);
table.updateUI();