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When to use convertRowIndexToModel

I have some JDialogs displaying JTables.
When the header columns are clicked a sort occurs on that column.
My question is : how can I know when a column header has been clicked and thus made a sort active.
When the sort is active, I know I should user the .convertRowIndexToModel method.
But how do I detect that a column is sorting in order not to mess the correct index if no sort is active?

Generally speaking, you should ALWAYS uses the convertRowIndexToModel when you take an index value from the view (JTable) and try and look up some value within the model. The JTable does this automatically when you use it's methods, but incase you're not, you need to take care of it yourself.
There's no need to know if the view is sorted or not...
If you "really" want to know when a table is sorted, you could attach a RowSorterListener to the TableRowSorter used by the table.
You could also use the TableRowSorter#getSortKeys to see which columns are included in the sort...

I have used it for my selection table. When the auto order is activated (setAutoCreateRowSorter(true))
the indices of the model table and the visual change, so you have to tell it to look for it within the model with respect to the one you are seeing.
((CustomTable)form.getAvailListView().getModel()).data.get(form.getListView().convertRowIndexToModel(i))

How can delete/hide the mid row(5)th row before it listed in jtable

Here i have an 1-10 row is listed in jtable i want to delete/hide the 5th row before it listed in jtable.
i set the rowheight but it affected the cellselection.Is there any way to hide/delete the row without affected the normal flow code?
If i remove the row it will throws ArrayIndexoutofBoundException.
in my project executed means one gui open in that gui listed the some string. In here we can add the more string via Add Button on popup Button
Here what i need is i have to hide the particular string. That string is placed on 1st row.
i need to hide the string from end user.
now u hope understand.

You can use the JTable row filtering support in order to hide certain rows without deleting them from the model. Also see this: How can I filter rows in a JTable?

You can eliminate rows in the table by calling the removeRow() method. If you want to just hide it instead of elimintaing it you need to customize the JTable's model to meet your specs on what to display.
http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

using DefaultTableModel with JTable you should be able to use model.removeRow(int row) function to remove A row from JTable. There is no way to hide a row based on index as much as i know. However, If you need to hide and re-show mechanism you need to save the row prior to delete it and Save the removedRow in a ArrayList to re-use them.. Something as follows:
List<Vector>deletedRows = new ArrayList<>();
Vector removingRow = (Vector) model.getDataVector().get(5);
deletedRows.add(removingRow);
model.removeRow(5);

How to restrain checking single checkbox in multiple columns in Jtable

I am trying to implement a Jtable which includes three check-box tables like this:
Can you tell me how to set a single selection group of checkboxes which only allows 1 selected check-box in a single row at any time?

I know of nothing out-of-the-box for doing this. I´d have a TableModelListener check these columns every time a change is made and call setValueAt on the checkboxes as needed.

Disable particular rows of a JTable

I would like to "grey out" particular rows of a JTable so that they may not be selected by any means. The other rows should still be selectable. How do I accomplish this?

You can either override JTable.changeSelection() to deselect the offending row whenever it's selected, or provide your table with a custom ListSelectionModel where you override setSelectionInterval(), addSelectionInterval(), etc. to prevent the row from being selected in the first place.

You will want to create a custom TableCellRenderer, one that will display "disabled" information greyed out. Read the Swing Table Tutorial for more on how to create these renderers, especially the section, Concepts: Editors and Renderers.

Create a temporary TableModel which has only the rows that you want to select. After the selection made and when you want to revert, change back to original TableModel

JFace TableViewer - Format cells depending on other cells

I have a JFace TableViewer. The values in one column should normally be unique, but there are cases where it makes sense that they are not (e.g. when a row was copied and not yet changed). However I want to alert the user of the duplicate values by highlighting the rows which contain duplicate values in that column. What's the best way to do this? The LabelProvider seems to only give me access to the current cell or at most the current row.
Thanks,
Thomas

To detect duplicate across the whole table, I guess you got to have some kind of map or set containing all the cell's data. The way I did was to put such map in the view (TableViewer container) and then have label provider holding a link to that view (hence the map). So from within label provider, it is able to detect duplicate and respond accordingly.