GridLayout内でのセル位置を取得する

GridLayout gl = new GridLayout(5, 7, 5, 5);
JPanel p = new JPanel(gl);
p.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

JTextArea log = new JTextArea(3, 0);
ActionListener al = e -> {
  JComponent c = (JComponent) e.getSource();
  int idx = p.getComponentZOrder(c);
  int row = idx / gl.getColumns();
  int col = idx % gl.getColumns();
  log.append(String.format("Row: %d, Column: %d%n", row + 1, col + 1));
};
for (int i = 0; i < gl.getRows() * gl.getColumns(); i++) {
  JButton b = new JButton();
  b.addActionListener(al);
  p.add(b);
}