JTableの罫線の有無とセルの内余白を変更

add(new JCheckBox(new AbstractAction("setShowVerticalLines") {
  @Override public void actionPerformed(ActionEvent e) {
    Dimension d = table.getIntercellSpacing();
    if (((JCheckBox) e.getSource()).isSelected()) {
      table.setShowVerticalLines(true);
      table.setIntercellSpacing(new Dimension(1, d.height));
    } else {
      table.setShowVerticalLines(false);
      table.setIntercellSpacing(new Dimension(0, d.height));
    }
  }
}));
add(new JCheckBox(new AbstractAction("setShowHorizontalLines") {
  @Override public void actionPerformed(ActionEvent e) {
    Dimension d = table.getIntercellSpacing();
    if (((JCheckBox) e.getSource()).isSelected()) {
      table.setShowHorizontalLines(true);
      table.setIntercellSpacing(new Dimension(d.width, 1));
    } else {
      table.setShowHorizontalLines(false);
      table.setIntercellSpacing(new Dimension(d.width, 0));
    }
  }
}));