Hi Freddy
A JComboBox manages objects not only Strings. It displays the value
returned by the "toString()" method in each of the objects, but inside
you can do whatever you want.
For e.g., define your own "ComboItem" class. For e.g.:
public class ComboItem {
private int index;
private String value;
public ComboItem( int i, String v ){
index = i; value = v;
}
@Override
public String toString(){
return "" + index + " " + value;
}
public int getIndex(){ return index; }
}
When you read the database, create a ComboItem for each record in the
database then add the ComboItem to your JComboBox. For e.g.:
....
JComboBox jcb = ...;
....
ResultSet rs = ...;
while ( rs.next()){
ComboItem ci = new ComboItem( rs.getInteger("INDEXNO"),
rs.getString("LABEL");
jcb.addItem( ci );
}
....
If you do this way, the JComboBox will display what "toString()" returns
for each of the items. I.e. index, space, value.
When the user ends entering the data (including choosing a line in the
JComboBox), you can get the object chosen by the user and the index number:
....
ComboItem ci = (ComboItem)(jcb.getSelectedItem());
int theIndexNumber = ci.getIndex();
....
Now, this is only one possible way to do it. Another way is to put all
the ComboItem objects into a collection when they are read from the
database, then fill the JComboBox based on the elements of the
collection (meaning separation between the database access level and the
user interface). And so on.
Hope it helps
Mihai
Le 07/11/2010 04:28, Shiv Shankar Prajapati a écrit :
Hi,
Go through following link, it might help you
http://www.javabeginner.com/java-swing/java-jcombobox-class-example
Here JComboBox takes string array which we can build at run time in
different ways. So fetch all the records and convert it in to String
array and then pass it to the JComboBox.
On Sat, Nov 6, 2010 at 8:58 AM, Freddy Castelblanco Macias
<thelords...@gmail.com <mailto:thelords...@gmail.com>> wrote:
Hi people !!!
Im working in Java with SQLJDBC and plain Files (secuencial,
Indexed ... etc). But ... I have to make a GUI and in one control of
Swing (JComboBox) I want to try to fill this control with information
that i have in my database or with information of my plain file. But i
want in one way:.... For example:
//this is de actionPerformed of the jCombobox
//so when im evaluating the content on this control i want capture the
value and display in the GUI the information //of this VALUE..
1 Coke
2 Bread
3 Lents
The number is the value witch i want work and the words must be
displayed in the GUI
SO how can i do that???
Help please !!!!
Some told me one day, that this I can do whith a Collection, but
How ??
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With Regards,
Shiv Shankar,
Persistent System Ltd.
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