jTable wrong Rownumber after navigate with up / down Keys

Question

To get the selected row in a jTable, I used a MouseEvent (MouseClicked). That works fine and give me the correct rownumber after clicking into the table.

To navigate trough the jTable, I added a new Listener (KeyPressed). If I press the up key, the rownumber is not been increased. If I press the up key again, the rowcount will be updated, but it is the rowcount from previously.

private void jTable1KeyPressed(java.awt.event.KeyEvent evt) { 
    if(evt.getKeyCode() == evt.VK_UP){
     System.out.println("Key UP" + jTable1.getSelectedRow()); 
    } 

    if(evt.getKeyCode() == evt.VK_DOWN){ 
    System.out.println("Key DOWN" + jTable1.getSelectedRow()); 
    }
}

This is the simple code. If I click into first row of table and press the down key, the output is "Key DOWN0". But the second row is selected and output should be "Key DOWN1".

Answer 1

To get the selected row in a jTable, I used a MouseEvent (MouseClicked). That works fine and give me the correct rownumber after clicking into the table.

To navigate trough the jTable, I added a new Listener (KeyPressed). If I press the up key, the rownumber is not been increased. If I press the up key again, the rowcount will be updated, but it is the rowcount from previously

.

I think that you would need to

• add ListSelectionListener to JTable

• change ListSelectionMode

Answer 2

@mKorbel already posted the correct answer: don't use low-level listeners for semantic requirements - ListSelectionModel/-Event hides all the low-level knitty-gritty details :-)

The details:

• JTable's internals have keyBindings to the up/down keys which change the selection
• keyBindings are served after the listeners

So at the time of your application code seeing the event, the table didn't yet had the opportunity to react - what you are printing is the selection before its internal change (triggered by the bindings).

Answer 3

You should use KeyReleased instead of KeyPressed