Hints Appreciated: How to fix a DefaultTableCellRenderer and getTableCellRendererComponent Clash!

//How do I get the below project to use the tooltips and color the rows cyan
//and gray. If I comment output the below indicated three lines I get column
//coloring, but lose tooltips.

Thank you,

// Reference:
// http://www.roseindia.net/java/example/java/swing/CustomCellRenderer.shtml

package customcellrenderer;

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

public class CustomCellRenderer
{
   JTable table;
   TableColumn tcol;

   public static void main(String[] args)
   {
      new CustomCellRenderer();
   }
  
    public static void StudentColTooltip(TableColumn OnLine_Col, String text)
    {
        DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
        
        renderer.setToolTipText(text);
        OnLine_Col.setCellRenderer(renderer);
    }
    
  public CustomCellRenderer()
  {
      JFrame frame = new JFrame("Creating a Custom Cell Reanderer!");

      JPanel panel = new JPanel();

      String data[][] = {{"Vinod","Computer","3"},
            {"Rahul","History","2"},
            {"Manoj","Biology","4"},
            {"Sanjay","PSD","5"}};

      String col [] = {"Name","Course","Year"};
      DefaultTableModel model = new DefaultTableModel(data,col);

      table = new JTable(model);

      tcol = table.getColumnModel().getColumn(0);
      tcol.setCellRenderer(new CustomTableCellRenderer());
      tcol = table.getColumnModel().getColumn(1);
      tcol.setCellRenderer(new CustomTableCellRenderer());
      tcol = table.getColumnModel().getColumn(2);
      tcol.setCellRenderer(new CustomTableCellRenderer());

      JTableHeader header = table.getTableHeader();
      header.setBackground(Color.yellow);

      JScrollPane pane = new JScrollPane(table);
      panel.add(pane);

      frame.add(panel);
      frame.setSize(500,150);
      frame.setUndecorated(true);

      frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
  }

  public class CustomTableCellRenderer extends DefaultTableCellRenderer
  {
      public Component getTableCellRendererComponent (JTable table,
            Object obj, boolean isSelected, boolean hasFocus, int row, int column)
      {
          Component cell = super.getTableCellRendererComponent(
                table, obj, isSelected, hasFocus, row, column);

          if ( isSelected )
          {
              cell.setBackground(Color.green);
          }
          else
          {
              if ( row % 2 == 0 )
              {
                  cell.setBackground(Color.cyan);
              }
              else
              {
                  cell.setBackground(Color.lightGray);
              }
          }

          //Commenting out the below 3 lines yields cyan and gray columns
          StudentColTooltip(table.getColumnModel().getColumn(0),"Student's Last Name");
          StudentColTooltip(table.getColumnModel().getColumn(1),"Student's Major");
          StudentColTooltip(table.getColumnModel().getColumn(2),"Year In School");
            
          return cell;
  
      }
  }
}