Java - quiero definir el tamaño de las columnas de un jtable

JTable table

TableColumn column = null;

for (int i = 0; i < 5; i++) {

    column = table.getColumnModel().getColumn(i);

    if (i == 2) {

        column.setPreferredWidth(100); //sport column is bigger

    } else {

        column.setPreferredWidth(50);

    }

}

class MyTableModel extends AbstractTableModel {

    private String[] columnNames = ...//same as before...

    private Object[][] data = ...//same as before...

    public int getColumnCount() {

        return columnNames.length;

    }

    public int getRowCount() {

        return data.length;

    }

    public String getColumnName(int col) {

        return columnNames[col];

    }

    public Object getValueAt(int row, int col) {

        return data[row][col];

    }

    public Class getColumnClass(int c) {

        return getValueAt(0, c).getClass();

    }

    /*

     * Don't need to implement this method unless your table's

     * editable.

     */

    public boolean isCellEditable(int row, int col) {

        //Note that the data/cell address is constant,

        //no matter where the cell appears onscreen.

        if (col < 2) {

            return false;

        } else {

            return true;

        }

    }

    /*

     * Don't need to implement this method unless your table's

     * data can change.

     */

    public void setValueAt(Object value, int row, int col) {

        data[row][col] = value;

        fireTableCellUpdated(row, col);

    }

    ...