Single Horizontal Line in JTable

Question

Hello,
is there a way to draw a single horizontal (colored) line within a JTable? (reason: we want to mark a seperation of the upper and lower part of the table). I dont mean the showHorizontalLines feature.
Example: the JTable contains 100 rows, row 1 - 30 belong to the "upper" part (according to a certain logic), 31- 100 to the lower part. The line should be between row 30 and 31, and only there.
Any help very much appreciated.
Matthias

Answer 1

You might be able to use a cell renderer to add a border to the bottom of every cell in row 30. The code would look something like:
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
class LineCellRenderer extends DefaultTableCellRenderer
     final Border bottomBorder = BorderFactory.createMatteBorder(0, 0, 2, 0, Color.black);
     public Component getTableCellRendererComponent(JTable table,
                                    Object value,
                                    boolean isSelected,
                                    boolean hasFocus,
                                    int row,
                                    int column)
          super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
          if (row == 30)
               setBorder( bottomBorder );
          else 
               setBorder( null );
          return this;
}