Swing/RadioButtonsLabelAlignment のバックアップ(No.1)

JPanel p = new JPanel(new GridBagLayout());
p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
p.setFocusTraversalPolicy(new ContainerOrderFocusTraversalPolicy());
p.setFocusTraversalPolicyProvider(true);
p.setFocusable(false);

GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 1;
gbc.insets.top = 5;
ButtonGroup group = new ButtonGroup();
List<JComponent> list = Arrays.asList(
    new JRadioButton("JRadioButton1"),
    new JRadioButton("JRadioButton2"),
    new JRadioButton("JRadioButton3"),
    new JLabel("JLabel1"),
    new JLabel("JLabel2"),
    new JCheckBox("JCheckBox1"),
    new JCheckBox("JCheckBox2"));
Icon icon = UIManager.getIcon("RadioButton.icon");
int iconWidth = icon == null ? 0 : icon.getIconWidth();
int left = 0;
for (JComponent c : list) {
  gbc.insets.left = 0;
  if (c instanceof JRadioButton) {
    JRadioButton button = (JRadioButton) c;
    if (left == 0) {
      button.setSelected(true);
      Insets insets = button.getInsets();
      left = insets.left + iconWidth + button.getIconTextGap();
    }
    group.add(button);
  } else if (c instanceof JLabel) {
    gbc.insets.left = left;
  }
  p.add(c, gbc);
}
gbc.gridx = 2;
gbc.weightx = 1.0;
gbc.insets.left = 5;
list.forEach(c -> p.add(new JTextField(), gbc));