JTable rows sorting without changing the "Sl No" column

Question

In my JTable, among other columns, I have a "Serial No" column which simply numbers the records in the table. I want this column to be fixed while I sort the rows by clicking on the JTable column headers. The sorting is happening alright, but the "Serial No" is getting mixed up in the process. Is there any way I could keep the "Serial No." column fixed while I sort the rows?

Thanks for your help on this.

Example:

SlNo Name
1 John
2 Peter
3 Alek

After sorting this by (clicking on 'Name' column), I get this:

SlNo Name
3 Alek
1 John
2 Peter

However, I would like the results as:

SlNo Name
1 Alek
2 John
3 Peter

sure almost everything is possible, but no idea what do...., for better help sooner post an [SSCCE](http://docs.oracle.com/javase/tutorial/uiswing/index.html) demonstrated your issue with mixed output from `RowSorter` — mKorbel, Sep 24 '12 at 06:44
don't quite understand: given rows with si == 0, 1, 2 ... after sorting another column you want to happen what? Keep that (like simple counting from top to bottom) as-is or make it jump to the now sorted rows (like an row identifier)? The latter is default, the former slightly unusual .. — kleopatra, Sep 24 '12 at 08:20
thanks for the clarification :-) You might want to have a look at http://tips4java.wordpress.com/2008/11/18/row-number-table/ — kleopatra, Sep 24 '12 at 08:52

MadProgrammer · Answer 1 · 2012-09-26T09:53:20.143

1

Have you tried implementing your own TableRowSorter?

Have a look at Sorting and Filtering

UPDATE

I've been digging around the code checking this out. It is doable, but you're going to have to reinvent the wheel to get it to work.

The default implementation simply compares row/column values together (getValueAt(row, column)) which is fine, but doesn't provide you with any context in order to make the decisions you need to make (ie, which row is been sorted, what the row value might be etc.), in fact the filter provides much more valuable information :P...

The method you really wan to override is private...(DefaultRowSorter.compare), but I'm not sure it will do what you want any way...

The only solution you have left is to implement you're solution from scratch (starting from RowSorter) that is capable of providing you with ALL the information you need in order to perform sub group sorting. Things like the table model, the row and columns been compared...

edited Sep 26 '12 at 09:53

answered Sep 24 '12 at 06:32

MadProgrammer

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hmm ... this looks a bit like a comment, isn't it :-) – kleopatra Sep 24 '12 at 08:15
@kleopatra it can be if you like, haven't had time to look at a demo – MadProgrammer Sep 24 '12 at 08:47
@MadProgrammer (even I upvoted), [look please here (first two points)](http://stackoverflow.com/a/12583887/714968) – mKorbel Sep 26 '12 at 09:57
@mKorbel I like the multi-sort example in the link!! Will be using that – MadProgrammer Sep 26 '12 at 10:01
glad if help you, but number of column is reduced, heve to read describtion by Darryr, I think the there no ways (direct without to write an mostrum) to manage more then 5-6 column, another issue could be an performance – mKorbel Sep 26 '12 at 10:14

score 0 · Answer 2 · answered Jan 15 '16 at 13:04

A really simple implementation of this would be

public class siNo implements RowSorterListener {
    JTable table;
    public siNo(JTable table) {
        this.table = table;
    }

    @Override
    public void sorterChanged(RowSorterEvent e)
    {
        for (int i = 0; i < table.getRowCount(); i++) {
            table.setValueAt(Integer.toString(i+1), i, 0);
        }
    }
}

Your class which contains table

sorter.setSortable(0, false);
sorter.addRowSorterListener(new siNo());

JTable rows sorting without changing the "Sl No" column

2 Answers2