Setting color in a specific JTable

Question

I was wondering if anyone could help me with this problem. I wish to set some cells in the first column only to Yellow. I have done the following;public class customTableCellRenderer extends
DefaultTableCellRenderer
    JTable table;
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
Component cell = super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);//getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        if(value instanceof String)
             String s= (String) value;
             if(value.equals("Monday"))
                cell.setBackground(Color.YELLOW);
            else
                cell.setBackground(Color.BLUE);
             return cell;
}and my class with the JTable calls the above class:
    public JPanel centre()
        JPanel tablePanel=new JPanel(new BorderLayout());
        Object[] titles = new String[]{"","9.00","10.00","11.00","12.00","13.00","14.00","15.00","16.00","17.00","18.00","19.00"};
        String[] rows = new String[]{"Monday","Tuesday","Wednesday","Thursday","Friday"};
        Object[][] data ={
                    {"Monday","","","","","","","","","","",""},
                     {"Tuesday","","","","","","","","","","",""}};
          DefaultTableModel model=new DefaultTableModel(data,titles); 
          table=new JTable(model);
         String[][] data = new String[rows.length][titles.length];
        JTable timeTable = new JTable(data, titles);         customTableCellRenderer cr=new customTableCellRenderer();
           try
            table.setDefaultRenderer( Class.forName
               ( "java.lang.Integer" ), cr );
        catch( ClassNotFoundException ex )
            System.exit( 0 );
        table.setDefaultRenderer(Color.class, cr);
        JScrollPane pane = new JScrollPane(table);  
        pane.setSize(new Dimension(500,300));
        pane.setViewportView(table);
        tablePanel.add("Center", pane);
        return tablePanel;
}it still doesnt set the color in the cells for; Monday, Tuesday, Wednesday, Thursday, Friday.

Answer 1

Your renderer isn't being used.
JTable chooses the appropriate renderer based on the value of the getColumnClass(...) method. Since you haven't overridden that method it thinks all data is an Object and uses the Object renderer.
The following lines accomplish nothing, since you don't store any Integers or Color objects in your table. Every Object is a String.
table.setDefaultRenderer( Class.forName( "java.lang.Integer" ), cr );
table.setDefaultRenderer(Color.class, cr);
If you want you can specifiy a renderer for a specific column. You get the TableColumn from the TableColumnModel and add the renderer directly to the column.
If all you want to do is color a cell, then another option is to override the prepareRenderer() method. Something like this:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=610474