SetPreferredWidth not working (using AUTO_RESIZE_OFF)

Question

Any help would be great. This is the code
          JPanel centerPanel = new JPanel();
          centerPanel.setBackground(Color.WHITE);
          cm = new CustomerModel();
          JTable table = new JTable(cm);
          table.setBackground(Color.WHITE);
          table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
          table.setPreferredScrollableViewportSize(new Dimension(800, 200));
          TableColumn tc = table.getColumnModel().getColumn(0);
          tc.setPreferredWidth(300);
          tc.setWidth(300);
          tc=table.getColumnModel().getColumn(1);
          tc.setPreferredWidth(300);
          tc.setWidth(300);
          tc=table.getColumnModel().getColumn(2);
          tc.setPreferredWidth(50);
          tc=table.getColumnModel().getColumn(3);
          tc.setPreferredWidth(50);
          tc=table.getColumnModel().getColumn(4);
          tc.setPreferredWidth(50);
          JScrollPane jsp = new JScrollPane(table);
          centerPanel.add(jsp);

Answer 1

Thank you.
It was the      fireTableChanged(null);
I didn't realise it reset the columns.
Thanks again.
Mark.