import javax.swing.border.TitledBorder;

static JPanel jCenteredSection(Component c) {
  ret jCenteredSection("", c);
}

static JPanel jCenteredSection(S title, Swingable c) {
  ret jCenteredSection(title, wrap(c));
}

static JPanel jCenteredSection(S title, Component c) {
  ret swing(func -> JPanel {
    JPanel p = jSection(title, c);
    ((TitledBorder) p.getBorder()).setTitleJustification(TitledBorder.CENTER);
    ret p;
  });
}

static JPanel jCenteredSection(S title) {
  ret jCenteredSection(title, jpanel());
}

Began life as a copy of #1006228