I'm using NetBeans to teach myself some java, and have covered most of the basics and I'm now trying to import data from a database and display some of it in a list box. My issue is with putting the data in a list box. I have a form with various buttons and stuff on it, and I've dragged a list box from the Swing Controls pane in NetBeans onto the form. I've deleted the elements in it, and as far as I can find, google seems to point me towards creating a Default list model, filling it, and then using that to populate my list box like so:
DefaultListModel listModel;
listModel = new DefaultListModel();
try{
con = DriverManager.getConnection( host, uName, uPass );
stmt = con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE );
String SQL = "SELECT * FROM `items`";
items_rs = stmt.executeQuery( SQL );
while(items_rs.next()){
int sn_col = items_rs.getInt("Serial_num");
String sn = Integer.toString(sn_col);
listModel.addElement(sn);
}
JList serialNumbers = new JList(listModel);
}
catch(SQLException err) {
JOptionPane.showMessageDialog(this,err.getMessage());
}
Only, it doesn't work. I've tested the above in a different project where I don't drag and drop the box onto the form, and instead add it using code and it seems to work fine (based on this example: http://www.java2s.com/Tutorial/Java/0240__Swing/UsingJList.htm ). Anyone able to tell me how to do it with a drag and drop list box?
Finally found the answer I was after. Turns out I needed one line changed:
serialNumbers.setModel(listModel);
Intead of
JList serialNumbers = new JList(listModel);
And hey presto! It's working.
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