Saving JTable edits to two dimensional Array

Question

I have a JTable whose cells are editable. However if i edit a cell and refresh the table. The changes are not saved. This is how i have defined the table:

    String [] columnNames = {"Application number",
                            "Name",
                            "date",
                            "fileLoc",
                            "Country"};
    //Data for the table
    String [][] data = table.tableArray;//tableArray is an array of array of strings.

    TableModel model = new DefaultTableModel(data, columnNames);
    JTable mainTable = new JTable(model);
    model.isCellEditable(data.length,columnNames.length);
    contentPane.add(new JScrollPane (mainTable));

I've had a look online but can't seem to find any advice on saving the changes made to a cell. Any help would be very welcome!

I guess i'm not refreshing the table as such. I use frame.dispose() and then create a new frame with the table in. — Hoggie1790, Mar 14 '13 at 16:18
I tried this, if I add a `TableModelListener` to your model, it fires when I change a cell. Your model _does_ get updated. — S.L. Barth is on codidact.com, Mar 14 '13 at 16:28
Model gets updated. There is no problem as you are using `DefaultTableModel`. There may be some other issue. Post [SSCCE](http://sscce.org/) to get sooner help. — Amarnath, Mar 14 '13 at 16:31
" I use frame.dispose() and then create a new frame" - is the above code inside the constructor / initialization of the new frame? If so, has the changed data been properly transferred to `table.tableArray`? — S.L. Barth is on codidact.com, Mar 14 '13 at 16:32

score 1 · Answer 1 · answered Mar 14 '13 at 16:34

1

I guess i'm not refreshing the table as such. I use frame.dispose() and then create a new frame with the table in.

then you lost all changes made in the current DefaultTableModel
don't top create a new JFrame with a new DefaultTableModel and a new JTable
all changes from TableCellEditor are changes dispayed in JTables view
JTable (with its model) is prepared for this job, don't to reacreate these Objects on runtime
DefaultTableModel has implemented all notifiers, there no needed to override any others events, nor to fireXxxXxx() programatically, but those events are required for AbstractTableModel
define add this code line for your JTablemainTable.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
DefaultTableModel respesenting your required 2D array

answered Mar 14 '13 at 16:34

mKorbel

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Thanks for the advice. Is it possible to make changes made in the JTable save to the 2D arraylist the table is based on? The reason being i will need to save this array and reload it when the program is restarted. Thanks. – Hoggie1790 Mar 14 '13 at 16:48
@Hoggie1790 Look at [getDataVector](http://docs.oracle.com/javase/7/docs/api/javax/swing/table/DefaultTableModel.html#getDataVector%28%29) to get the data that model is using. – Amarnath Mar 14 '13 at 16:59
+1, the key to solving the problem is the table client property as described in more detail in [Table Stop Editing](http://tips4java.wordpress.com/2008/12/12/table-stop-editing/). – camickr Mar 14 '13 at 18:13

Saving JTable edits to two dimensional Array

1 Answers1