table column sort

I want to find out if a column is sorted Ascendingly using the following line, but it keeps giving me a Null Pointer exception. Does anyone know why? Or if you know of another way to find out how a tabal column is sorted?
Thanks.

if (Table.getRowSorter().getSortKeys().get(0).getSort Order().equals(SortOrder.ASCENDING))

probably because one of the objects is null.

- maybe table doesn't have a row sorter
- maybe row sorter doesn't have keys
- maybe the first key doesn't have sort order

split your one line into separate assignments and you'll at least know what exactly is failing...

When a JTable is created it doesn't create a row sorter automaticall?

good question. if you split up your line like I'm suggesting, you'll find the answer to that.

You are obsolutely correct. The row sorter is null.
So now my question is, if this table doesn't have a road sorter, can I still be able to find out how the column is sorted?

taking a look at How to Use Tables (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components), i think all you have to do is say

Code:

---

table.setAutoCreateRowSorter(true);

---

which indeed seem kind of crooked... hope that works.

The table I am dealing with is an existing table which I don't want to make any changes if I don't have to.
Without a rowsorter, can I still be able to find out how the columns are sorted?

i doubt it, frankly...

If I am going to add a row sorter...

The following table model "DtableModel"extends "AbstractTableModel" (old code)

DTableModel model = new DTableModel(columnDefinitions);

I added the following:

final TableRowSorter<DTableModel> sorter = new TableRowSorter<DTableModel>(model);

this.indicationTable.setRowSorter(sorter);

The statement "this.indicationTable.setRowSorter(sorter);" gave me an exception.

Do I have to use DefaultTableModel instead of my own (DTableModel)?