int nbreColonne = jTable1.getSize().width;
        TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(jTable1.getModel());
        Comparator<String> comparator = new Comparator<String>()
        {
            public int compare(String s1, String s2)
            {
                String[] strings1 = s1.split("\\s");
                String[] strings2 = s2.split("\\s");
                return strings1[strings1.length - 1]
                        .compareTo(strings2[strings2.length - 1]);
            }
        };
        for (int i = 0; i < nbreColonne; i++)
        {
              sorter.setComparator(i, comparator);

        }
        jTable1.setRowSorter(sorter);