How to use

setOpaque

method

in

javax.swing.table.DefaultTableCellRenderer

private void configureTableAppearance() {
 tableDevices.setOpaque(false);
 ((DefaultTableCellRenderer) tableDevices.getDefaultRenderer(Object.class)).setOpaque(false);
 tableDevices.setAutoResizeMode(JTable.AUTO_RESIZE_SUBSEQUENT_COLUMNS);
 tableDevices.getColumnModel().getColumn(0).setPreferredWidth(100);
 tableDevices.getColumnModel().getColumn(1).setMinWidth(85);
 tableDevices.getColumnModel().getColumn(1).setMaxWidth(85);
 tableDevices.getColumnModel().getColumn(2).setMinWidth(215);
 tableDevices.getColumnModel().getColumn(2).setMaxWidth(215);
 tableDevices.getColumnModel().getColumn(2).setCellRenderer(new ConnectDisconnectRenderer());
 tableDevices.getColumnModel()
   .getColumn(2)
   .setCellEditor(new ConnectDisconnectEditor(new JCheckBox(), this));
}

DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
 renderer.setBorder(BorderFactory.createMatteBorder(0, 0, 3, 0, Color.RED));
 renderer.setOpaque(true);
 renderer.setBackground(Color.WHITE);

renderer.setOpaque( false );
renderer.setHorizontalAlignment( SwingConstants.RIGHT );
renderer.setFont( SMALL_FONT );

renderer.setOpaque( false );
renderer.setHorizontalAlignment( SwingConstants.RIGHT );
renderer.setFont( SMALL_FONT );

if (header != null && levelMatrixTable.getColumnCount() > 0) {
  DefaultTableCellRenderer aux = new DefaultTableCellRenderer();
  aux.setOpaque(true);
  aux.setBorder(BorderFactory.createBevelBorder(EtchedBorder.RAISED));
  aux.setHorizontalAlignment(DefaultTableCellRenderer.CENTER);