Cell request focus problem

Question

Hi,
I have jtable with two column. Column A and column B. I type string "stupid" in column A. Then when I change the cell by pressing Enter or right arror or other arrow, it suddenly check the value in column A with the string "clever". Then it is not same. So my Jtable put focus in that cell again and hightlight the string "stupid" so when user type something, the string "stupid" is cleared and replaced by whatever the user typed. The user is forced to type string "clever" otherwise he cann't go anywhere.
How do I do that? ( put focus on certain cell and hightlight the string )
I don't know how to hightlight but this is how I try to give the focus to that cell:
JTable.getModel().addTableModelListener( new TableModelListener() {
    public void tableChanged(TableModelEvent tme) {
        final int column = tme.getColumn();
        final int row = tme.getFirstRow();
        if(column==0) {
            try {
                if((String)JTable.getValueAt(row,column)!="clever") {
                        JTable.setEditCell(row,column);
            catch( SQLException e ) {
                e.printStackTrace();
});With this code, I looked up in that cell. Cann't do anything. Cann't push the button. I just have to kill it by operating system.
Thank you.

Answer 1

A TableModelListener listens for changes that have already been made to the table, so you should not be doing error checking here.
Here is one way (I don't know if its the best) that allows you to do some error checking:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class TableEdit extends JFrame
     TableEdit()
          JTable table = new JTable(5,5)
               public void changeSelection(int row, int column, boolean toggle, boolean extend)
                    if (! isEditing())
                         super.changeSelection(row, column, toggle, extend);
                    else
                         DefaultCellEditor editor = (DefaultCellEditor)getCellEditor();
                         editor.getComponent().requestFocusInWindow();
          table.setPreferredScrollableViewportSize(table.getPreferredSize());
          JScrollPane scrollpane = new JScrollPane(table);
          getContentPane().add(scrollpane);
          //  Use a custom editor
          TableCellEditor fce = new FiveCharacterEditor();
          table.setDefaultEditor(Object.class, fce);
     class FiveCharacterEditor extends DefaultCellEditor
          FiveCharacterEditor()
               super( new JTextField() );
               ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));
          public boolean stopCellEditing()
               try
                    String editingValue = (String)getCellEditorValue();
                    if(editingValue.length() != 5)
                         ((JComponent)getComponent()).setBorder(new LineBorder(Color.red));
                         getComponent().requestFocusInWindow();
                         JOptionPane.showMessageDialog(
                              null,
                              "Please enter string with 5 letters.",
                              "Alert!",JOptionPane.ERROR_MESSAGE);
                         return false;
               catch(ClassCastException exception)
                    return false;
               return super.stopCellEditing();
          public Component getTableCellEditorComponent(
               JTable table, Object value, boolean isSelected, int row, int column)
               Component c = super.getTableCellEditorComponent(table, value, isSelected, row, column);
               ((JComponent)c).setBorder(new LineBorder(Color.black));
               return c;
     public static void main(String [] args)
          JFrame frame = new TableEdit();
          frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
          frame.pack();
          frame.setLocationRelativeTo( null );
          frame.setVisible(true);
}