A JTable, a datamodel and a refresh method walk into a pub...

Question

Hi. I have been reading the forums all morning to get help with this but can't seem to find something to suit so far.
I've made a configurable db connector and a GUI for viewing its contents in a JTable after specifying ip address, port number etc.
So far I've got a customised AbstractTableModel to set itself up on default db connection settings and the JTable opens up with that datamodel.
Fine up to this. Its static, just shows up and sits there.
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What I need:
The JTable should have a default setting of everything blank.
After specifying the db connection you click launch connection button.
I want to be able to connect to a database (no problem there) and get the JTable to populate from this current database.
Then clicking the button again closes the db connection (again, no problem there) and I want the JTable to return to default blank.
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In a nutshell:
'How can I use a TableModel that can change its contents and refresh/update a JTable from it?'
Any Ideas?

Answer 1

<code>
public class DataTableModel extends AbstractTableModel
private int maxCol = 0;
private List header = new ArrayList();
private List data = new ArrayList();
public DataTableModel() {
public int getRowCount() {
if(data.size()==0)
return 6;
return data.size();
public int getColumnCount() {
if(maxCol == 0)
return 6;
return maxCol;
public String getColumnName(int columnIndex) {
if(columnIndex>=header.size())
return "Colonne "+(columnIndex+1);
return header.get(columnIndex).toString();
public Class getColumnClass(int columnIndex) {
try{
return Class.forName("String");
}catch(Exception e){}
return null;
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
public Object getValueAt(int rowIndex, int columnIndex) {
if(rowIndex>=data.size())
return null;
List tmp = (List) data.get(rowIndex);
if(columnIndex>=tmp.size())
return null;
return tmp.get(columnIndex);
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
/**@todo: Implement this javax.swing.table.TableModel method*/
throw new java.lang.UnsupportedOperationException("Method setValueAt() not yet implemented.");
public void addRow(List row){
data.add(row);
if(row.size() > maxCol)
maxCol = row.size();
public void setHeader(List header){
this.header = header;
if(header.size()>maxCol)
maxCol = header.size();
public void setColumName(String value,int index){
if(header.size()==0){
for(int i=0;i<index;i++)
header.add("Colonne "+(i+1));
header.add(value);
double max = Math.max(maxCol,6);
for(int i=header.size();i<max;i++)
header.add("Colonne "+(i+1));
return;
header.remove(index);
header.add(index,value);
public void reinit(){
header.clear();
data.clear();
</code>
this the code of my table model...At the beginning the table has 6 colums and 6 rows.