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Why my table's columName invisiable?

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I put my table on a JDialog.Everything is OK except the colum name.Bellow is my code.
import javax.swing.table.AbstractTableModel;

public class GeneralTableModel extends AbstractTableModel{
private String[] columnName;
private String[] cell;

public GeneralTableModel(String[] columnName, String[] cell) {
this.columnName = columnName;
this.cell = cell;
public int getRowCount() {
return cell.length / columnName.length;
public int getColumnCount() {
return columnName.length;
public Object getValueAt(int row, int column) {
int index = row * columnName.length + column;
return cell[index];
public String getColumName(int column) {
return columnName[column];


//then I use JBuilder to do GUI design
tale = new JTable(tableModel);

Where is the problem?
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To what component is your table added? If it's not inside a scrollpane then

"Note that if you wish to use a JTable in a standalone view (outside of a JScrollPane) and want the header displayed, you can get it using getTableHeader() and display it separately. " - from the api

If it's in a scrollpane, then please can you post the code where you are creating the table and adding it to the scrollpane.

Qunfeng Wang
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Thank you very much.
I haven't place the table in a ScrollPane in deed.
And in my table model,I haven't overried getColumnName(int column).Instead of that I add a new methord getColumName(int column) by mistake.So when I place my table in a scrollPane,the column name dispaly like that,A, B,...
Now everything is Ok.
I am from China,and not good at english.
I hope I have expressed me clearly.
Thank you!
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