I failed to color JTable cells

Question

Hello,
I'm trying to set the background color of JTable cells based on their content.
For example if I edit a cell and put a R, I'd like to paint the background in Red.
If I enter B, I want it becomes Blue, and so on.
I tried to use a few examples found in various fora, but all failed.
in addition, I do not understand why I should extend JLabel and not another Class ?
Thanks for help.
Here is a sample code (in which all cells should become red whatever is typed in).
import javax.swing.table.*;
import javax.swing.*;
public class TableRenderer extends JLabel implements javax.swing.table.TableCellRenderer {
public java.awt.Component getTableCellRendererComponent
    javax.swing.JTable table,
   Object value,
   boolean isSelected,
   boolean hasFocus,
   int row,
   int column
     setBackground(java.awt.Color.red);   // for the moment All cells will be red
     return this;
   mytable  = new javax.swing.JTable(5,5);
   TableColumn[] column = new TableColumn[5];
   TableColumnModel colModel = mytable.getColumnModel();
   for (int i=0; i <5 ;i++)
                column[i] = colModel.getColumn( i );
                column.setCellRenderer(new TableRenderer());

Answer 1

Finally after many tries I found a good way to do what I wanted.
If some people are interested, here is the code.
import java.awt.*;
import javax.swing.table.*;
import javax.swing.*;
class MyClass
public class TableRenderer extends javax.swing.table.DefaultTableCellRenderer
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column)
     Component xx = super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
        String val = (String) table.getValueAt(row, column);
        if (gegeutil.Gegetools.isEmpty(val)) super.setBackground(Color.white);
        else if(val.equals("Tournament")) super.setBackground(Color.red);
          else if(val.equals("Class"))super.setBackground(Color.orange);
          else if(val == "")           super.setBackground(Color.white);
        else super.setBackground(Color.blue);          
               return xx;
public TableRenderer() {
     super();
JTable table = new JTable(nbrow, nbcolumn);
table.setDefaultRenderer(Object.class, new TableRenderer());
}