code: void switchTwoColumns(int columnIndex, int columnToIndex) {
          for (int i = 0; i < getRowCount() - 1; i++) {
              Object cellData = getItems()[i][columnToIndex];
              getItems()[i][columnToIndex] = getItems()[i][columnIndex];
              getItems()[i][columnIndex] = cellData;
          }
      }
docs: Switch 2 columns with data
  
  @param columnIndex   column from
  @param columnToIndex column to