Smart checkbox group selection on JTable

// smart checkbox behaviour on jtable columns

    JTable table = new JTable() {
      @Override public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {
        if (Boolean.class != getColumnClass(columnIndex)) {
          super.changeSelection(rowIndex, columnIndex, toggle, extend);
        } else if (isRowSelected(rowIndex)) {
           Boolean b = !(Boolean.TRUE == getValueAt(rowIndex, columnIndex));
           int[] tra = getSelectedRows();
           for (int i : tra) {
             setValueAt(b, i, columnIndex);
             int mri = convertRowIndexToModel(i);
             tableChanged(new TableModelEvent(getModel(), mri, mri,
               TableModelEvent.ALL_COLUMNS, TableModelEvent.UPDATE));
           }
        }
      }
    };