static JTextPane jcenteredtextpane() {
  ret centerTextPane(jtextpane());
}

static JTextPane jcenteredtextpane(S text, AttributeSet attributes) {
  ret centerTextPane(jtextpane(text, attributes));
}

static JTextPane jcenteredtextpane(S text) {
  ret centerTextPane(jtextpane(text));
}