Sorting blank column in jTable

Question

Hi all,
I am having problem sorting blank columns.
I have already read thru [http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#sorting]
Using setAutoCreateRowSorter works except when sorting blank column as i want all blank column to be sorted to the bottom be it ascending or descending order.
I am using Comparator to do the sorting but how do I know when it is doing ascending or descending?
Edited by: zwseo on Jul 17, 2008 7:25 PM

Answer 1

TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(this.dataTable.getModel());
            Comparator<String> comparator = new Comparator<String>() {
                public int compare(String s1, String s2) {
                    if (s1.compareTo(s2) == 0) { // same string
                        return s1.compareTo(s2);
                    } else {
                        if (s1.trim().equals("") && !s2.trim().equals("")) //string 1 is null
                            //if ascending, return positve
                            return s1.compareTo(s2);
                            //if decending, return negative
                            //return s2.compareTo(s1);
                        else if (!s1.trim().equals("") && s2.trim().equals("")) //string 2 is null
                            //if ascending, return negative
                            return s2.compareTo(s1);
                            //if decending, return positive
                            //return s1.compareTo(s2);
                        else {
                            return s1.compareTo(s2);
            this.dataTable.setRowSorter(sorter);I am not sure whether i am doing this right.... please help me on the comments part... i do not know how to write that if statement.