import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
class JtableCellValidation extends JFrame
{
private JPanel topPanel;
private JTable table;
private JScrollPane scrollPane;
private String[] columnNames=new String[3];
private String[][] dataValues=new String[3][3];
JTextField textBox=new JTextField();
public JtableCellValidation()
{
setTitle(“JTable Cell Validation”);
setSize(300,300);
setDefaultCloseOperation (EXIT_ON_CLOSE);
topPanel=new JPanel();
topPanel.setLayout(new BorderLayout());
getContentPane().add(topPanel);
columnNames=new String[] {“Column 1″ ,”Column 2”, “Column 3”};
dataValues=new String[][]
                   {
                   {“1″,”2″,”3”},
                   {“4″,”5″,”6”},
                   {“7″,”8″,”9″}
                   };
TableModel  model=new myTableModel();
table=new JTable();
table.setRowHeight(50);
table.setModel(model);
TableColumn soprtColumn=table.getColumnModel().getColumn(1);
soprtColumn.setCellEditor(new DefaultCellEditor (textBox));
table.setCellSelectionEnabled(true);
scrollPane=new JScrollPane(table);
topPanel.add(scrollPane,BorderLayout.CENTER);
textBox.addKeyListener(new KeyAdapter()
{
public void keyTyped(KeyEvent e)
{
if(!Character.isDigit(e.getKeyChar()) && e.getKeyChar() !=KeyEvent.VK_BACK_SPACE)
{
textBox.setEditable(false);
textBox.setBackground(Color.WHITE);
JOptionPane.showMessageDialog(null,”String Type Entry Not Allowed”);
}
else
{
textBox.setEditable(true);
}
}
});
table.addMouseListener(new java.awt.event.MouseAdapter()
{
public void mouseClicked(java.awt.event.MouseEvent e)
{
}
});
}
public class myTableModel extends DefaultTableModel
{
myTableModel()
{
super(dataValues,columnNames);
}
public boolean isCellEditable(int row,int cols)
{
return true;
}
}
public static void main(String args[])
  {
  JtableCellValidation x=new JtableCellValidation();
  x.setVisible(true);
  }
}