static void fillTableWithStrings(final JTable table, L<L<S>> rows, L<S> colNames) {
  fillTableWithStrings(table, rows, toStringArray(colNames));
}

// thread-safe
static void fillTableWithStrings(final JTable table, L<L<S>> rows, S... colNames) {
  final DefaultTableModel model = fillTableWithStrings_makeModel(rows, colNames);
  
  awtIfNecessary {
    setTableModel(table, model);
  }
}

static DefaultTableModel fillTableWithStrings_makeModel(L<L<S>> rows, S... colNames) {
  Object[][] data = new Object[rows.size()][];
  int w = 0;
  for (int i = 0; i < rows.size(); i++) {
    L<S> l = rows.get(i);
    Object[] r = new Object[l.size()];
    for (int j = 0; j < l.size(); j++)
      r[j] = l.get(j);
    data[i] = r;
    w = Math.max(w, l.size());
  }
  O[] columnNames = new O[w];
  for (int i = 0; i < w; i++)
    columnNames[i] = i < l(colNames) ? colNames[i] : "?";
  ret new DefaultTableModel(data, columnNames);
}

Began life as a copy of #1001431