I have a JTable with columns that contain only numbers. I am using setAutoCreateRowSorter(true) to sort the columns. The number columns by deafault use number comparator.
The issue that rises is when i havean empty cell in the number column, i get aClassCastException(). How can I handle such situations please.
Thanks in advance.
Working on a deadline for work... ;-)
Hope this helps you out. I ran across something like this the other day.
You might see if you can change your default TableRenderer to fix this for you.
So something like this...
package gui.model;
import java.awt.Component;
import java.util.Date;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.Color;
import util.AcConfig;
public class AC_TableCellRenderer
extends DefaultTableCellRenderer
{
/**
* Format this based on the default type.
* Just do what the parent does
*
* @param value Object
*/
public void setValue(Object value)
{
if (value instanceof Date)
{
setHorizontalAlignment(CENTER);
super.setValue(AcConfig.GUI_DATE.format(value));
return;
}
super.setValue(value);
}
/**
*
* Returns the default table cell renderer.
*
* @param table the <code>JTable</code>
* @param value the value to assign to the cell at
*<code>[row, column]</code>
* @param isSelected true if cell is selected
* @param hasFocus true if cell has focus
* @param row the row of the cell to render
* @param column the column of the cell to render
* @return the default table cell renderer
*/
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column)
{
// call super for default behavior
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (column == 0 || value.equals("N/A"))
{
setHorizontalAlignment(CENTER);
}
else
{
setHorizontalAlignment(RIGHT);
}
if (value.equals("N/A"))
{
setForeground(Color.RED);
}
else
{
setForeground(Color.BLACK);
}
return this;
}
}
Then when you build your JTable do ...
// put a special renderer on the table for STRINGS and DATES
DefaultTableCellRenderer renderer = new AC_TableCellRenderer();
_allDataTable.setDefaultRenderer(String.class, renderer);
_allDataTable.setDefaultRenderer(Date.class, renderer);
I'm guessing but I'm willing to bet you have an edge condition where you number is a NaN or null and blowing up the cell renderer or cell editor.
Regards,