How can I do sorting from ascending to descending then unsort?

Question

Hi all,
Can anybody help on this issue?
I have a bunch of numbers in a table, and I hope when I click the column header once, it will do ascending.
Click again, do descending. Then click three times, become unsort (which is origially ordered in absolute value).
I tried to add tree SortKeys in sorter, but it doesn't work:
List<RowSorter.SortKey> sortKeys = new ArrayList<RowSorter.SortKey>();
sortKeys.add(new RowSorter.SortKey(2, SortOrder.UNSORTED));      // 2 means it's the 3rd column I want to sort
sortKeys.add(new RowSorter.SortKey(2, SortOrder.DESCENDING));
sortKeys.add(new RowSorter.SortKey(2, SortOrder.ASCENDING));
sorter.setSortKeys(sortKeys);Then I tried to implement my own Comparator, but will always get numbers ordered in absolute value.
        Comparator<Float> comparator = new Comparator<Float>() {
            public int compare(Float s1, Float s2) {
                if (s1 < 0) s1 *= (-1);
                if (s2 < 0) s2 *= (-1);
                return s1.compareTo(s2);   
        sorter.setComparator(2, comparator);      // 2 means it's the 3rd column I want to sortThank you very much indeed in advance.
Cheers,
George

Answer 1

Apologies for not saying it clearly.
I can easily do ascending and decending by applying this:
        sorter = new TableRowSorter<TableModel>(table.getModel());
        table.setRowSorter(sorter);But I also need my data to be sorted by absolute value. That's why I tried to implement my own Comparator.
However, it turned out that I will only have one sorting method, which is the absolute value as you have noticed.
Hence I hope the result, if possible, would be if I first click the column header, ascending orders.
Click the second time, decending orders. And then click the third time, absolute value orders.
Cheers