auto update jtable columns when model changes

Question

I've got a class which implements the TableModel Interface. When I call setModel on my jTable and set my class as the model and then call jTable.updateUI();everything is fine. But in some circumstances I want to change the model with a different structure. Displaying the data still works fine but my columns are not updated. Is there a way of forcing my table to also refresh the columns from new model?

Your model implementation is incorrect. Application code _never_ calls updateUI. — kleopatra, Jun 20 '12 at 12:16

score 6 · Accepted Answer · answered Jun 20 '12 at 12:12

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The model needs to fire the according event, e.g.: fireTableStructureChanged, if both the data and the structure changed.

http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#fire

answered Jun 20 '12 at 12:12

Puce

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but I'm not extending `AbstractTableModel` I'm using the interface – soupdiver Jun 20 '12 at 12:16
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follows link (added +1) this answer is correct to your too wide question, for better help sooner post an [SSCCE](http://sscce.org/) – mKorbel Jun 20 '12 at 12:19
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Most likely, you really should. DefaultTableModel is a very data centric approach rather than an Object Oriented approach, which leads to many design issues. A custom model (usually based on AbstractTableModel) on the other hand can wrap around a list of objects. – Puce Jun 20 '12 at 12:20
You write you have a class which implements TableModel. Then you have to make sure to notify the listeners if there were some changes. AbstractTableModel provides some helper methods. – Puce Jun 20 '12 at 12:24

score 4 · Answer 2 · edited May 23 '17 at 11:52

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jTable.updateUI(); is Look and Feel relevant method, don't use that

I've got a class which implements the TableModel Interface.

you have to override right notifiers for methods from TableModel
use DefaultTableModel, there are all notifiers implemented in the API,
all updates must be done on EventDispatchThread

edited May 23 '17 at 11:52

Community

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answered Jun 20 '12 at 12:16

mKorbel

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But my model also extends from `Observer` so I cannot simply change to also extending `DefaultTableModel` – soupdiver Jun 20 '12 at 12:26
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java.util.Observer is an interface or what Observer are you talking about? – Puce Jun 20 '12 at 12:32
AH excuse me I meant `Observable` – soupdiver Jun 20 '12 at 12:33

score -1 · Answer 3 · answered Jan 23 '13 at 08:42

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If like me you are just writing a small hack, you may consider using the .repaint() method, instead of the .updateUI() method.

I used this because I don't use a TableModel, but I just have data in a Object[][], just like in the first example of the sun (well oracle) tutorial

answered Jan 23 '13 at 08:42

lut

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no, repaint isn't needed with a well-behaved model (and note: there's _always_ a model driving the JTable - it might be an immutable implementation, though) – kleopatra Jan 23 '13 at 10:47

score -1 · Answer 4 · answered Jan 22 '14 at 19:08

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Try this (insert after setModel(myTableModel); line):

myJTable.createDefaultColumnsFromModel();

In my case it solved the update issue, while: .repaint(), .invalidate(), .fireTableDataChanged() didn't help.

answered Jan 22 '14 at 19:08

vvinjj

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no, that's not a method to call by application code: happens automatically on setModel (provided you did't change the default true value of autoCreateColumns). If it appears to help in your context, something is wrong elsewhere – kleopatra Jan 23 '14 at 00:18

auto update jtable columns when model changes

4 Answers4