import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;

public class TestTableFrame extends JFrame
{
    private JTable table;
    private DefaultTableModel model;
    
    public TestTableFrame()
    {
        model = new DefaultTableModel(3, 3);
        model.addTableModelListener(new TableModelListener()
            {
                public void tableChanged(TableModelEvent event)
                {
                    if (event.getColumn() == 0)
                    {
                        int row = event.getFirstRow();
                        Object data = model.getValueAt(row, 0);
                        model.setValueAt(data, row, 1);
                        model.setValueAt(data, row, 2);
                    }
                }
            });
        table = new JTable(model);
        
        add(new JScrollPane(table));
    }
    
    public static void main(String[] args)
    {
        JFrame frame = new TestTableFrame();
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

------解决方案--------------------
加监听，当第一列数据改变时，补齐后面两列的数据