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How to display contents of JList or drop down list?

L Willie
Ranch Hand

Joined: Aug 10, 2008
Posts: 51





i try it,however fail to display the contents.thank and appreciate your help and advise
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38334
    
  23
I think with the contents of that posting, it would sit better on our Swing forum.

Moving.
Michael Dunn
Ranch Hand

Joined: Jun 09, 2003
Posts: 4632
looks like you may need a refresher course on how things work.

ArrayList list = new ArrayList();
Object[] arrayObject=list.toArray();
private JList receiverID_lst = new JList(arrayObject);

here, arrayObject is empty, ergo, receiverID_lst is also empty.

private DefaultListModel model = new DefaultListModel();
and, later
model.addElement(rs.getString("User_ID"));
all well and good, but means nothing('ether code'), model never being set.

ResultSet rs = stmt.executeQuery....
while(rs.next()){
...
list.add( rs );
...
}
strange bit of code, that lot

receiverID_lst.setListData(arrayObject);
well, arrayObject is still empty (there is no auto-recalculation)

disclaimer: comments from perusal of code only
L Willie
Ranch Hand

Joined: Aug 10, 2008
Posts: 51
thank your reply,someone advise me study "Collection Framework".study now.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38334
    
  23
Start here.
 
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subject: How to display contents of JList or drop down list?