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Re: JComboBox with IDentifiers

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  Re: JComboBox with IDentifiers Sax@DIST.remove-nlb-this - 2012-08-13 18:36 +0000
    Re: JComboBox with IDentifiers "markspace" <markspace@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
      Re: JComboBox with IDentifiers Sax@DIST.remove-nlb-this - 2012-08-13 18:36 +0000
        Re: JComboBox with IDentifiers "Daniele Futtorovic" <daniele.futtorovic@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000

#17812 — Re: JComboBox with IDentifiers

From: "Sax@DIST" <roberto.sagoleo@gmail.com>

Hi People,
 thanks a lot for your kind replies.   08-)

I'll (try to) follow your suggests for JAVA programming in the future, as I'm 
working in JAVA language since a few days, and I didn't find any solution to my 
needs, so I wrote this one in the while of finding info about my needs!   0;-P

BtW: which is the best place where to find (lots of simple) examples for 
learning the JAVA philosophy; for example: a *good and simple* solution for 
this problem?   08-?

PS: I must use the Eclipse environment in the development of this small 
project, as it's part of a bigger one!   08-!

Thanks a lot again,
 Roberto.   08-)



On Friday, August 10, 2012 11:41:33 PM UTC+2, Sax@DIST wrote:
> Hi Guys,
> here I am again with another amazing trouble!   08-)
> I need to create a JComboBox containing a list of Items,
> each of which has its own IDentifier!
> So: when I select an Item of the JComboBox,
> I need to get its IDentifier
> (ie: its ID in a DataBase Table).
> I wrote the following four classes example,
> and I hope this could help someone else with my same needs!
> ...
>

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#17814

  To: Sax@DIST
From: markspace <-@.>

On 8/12/2012 2:03 PM, Sax@DIST wrote:

> BtW: which is the best place where to find (lots of simple) examples
> for learning the JAVA philosophy; for example: a *good and simple*
> solution for this problem?   08-?


Well, I still don't know what the problem is,  other than "I don't know Java." 
(Note spelling--not all caps.)  Anything you read now should help, since you 
are just beginning.  Here's two ideas, both from the Java tutorial (which you 
should certainly read).

JCombobox:

<http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html>

Database connections:

<http://docs.oracle.com/javase/tutorial/jdbc/index.html>

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#17831

  To: markspace
From: "Sax@DIST" <roberto.sagoleo@gmail.com>

Hi markspace,
 thanks a lot for the two links you suggested me about the Java Programming
Language!   0;-)

The first one, about the "correct" usage of JComboBox itself, is very detailed 
and I think I can find what I need, reading the lots of examples.

The second one, about the database connection, will be very useful for me, as I 
need to get the data for the items of my JComboBox from a DataBase Table.

After all, my needs are very simple: (o) to read some records (fields required: 
'IDentifier' and 'Description') from a DB-Table
(o) to show the 'Description' of the records as Items of the JComboBox (o) to 
do something else with the 'IDentifier' of the selected Item within the 
JComboBox

Thanks again for your precious help,
 Greetings.
  Roberto
   08-)



On Sunday, August 12, 2012 11:37:51 PM UTC+2, markspace wrote:
> On 8/12/2012 2:03 PM, Sax@DIST wrote:
> > BtW: which is the best place where to find (lots of simple) examples
> > for learning the JAVA philosophy; for example: a *good and simple*
> > solution for this problem?   08-?
>
> Well, I still don't know what the problem is,  other than "I don't know
> Java." (Note spelling--not all caps.)  Anything you read now should
> help, since you are just beginning.  Here's two ideas, both from the
> Java tutorial (which you should certainly read).
> JCombobox:
> <http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html>
> Database connections:
> <http://docs.oracle.com/javase/tutorial/jdbc/index.html>
>

--- BBBS/Li6 v4.10 Dada-1
 * Origin: Prism bbs (1:261/38)
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#17835

  To: Sax@DIST
From: Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>

On 13/08/2012 18:22, Sax@DIST allegedly wrote:
> Hi markspace,
>  thanks a lot for the two links you suggested me about the Java Programming
Language!   0;-)
>
> The first one, about the "correct" usage of JComboBox itself, is very
detailed and I think I can find what I need, reading the lots of examples.
>
> The second one, about the database connection, will be very useful for me, as
I need to get the data for the items of my JComboBox from a DataBase Table.
>
> After all, my needs are very simple:
> (o) to read some records (fields required: 'IDentifier' and 'Description')
from a DB-Table
> (o) to show the 'Description' of the records as Items of the JComboBox
> (o) to do something else with the 'IDentifier' of the selected Item within
the JComboBox
>
> Thanks again for your precious help,
>  Greetings.
>   Roberto
>    08-)

Hi Roberto,

You should create a custom data structure containing the data you need 
(identifier and representation, from the looks of it), add them to the 
JComboBox's contents, and use a custom renderer 
(<http://docs.oracle.com/javase/6/docs/api/javax/swing/JComboBox.html#setRender
er(javax.swing.ListCellRenderer)>).
That way, the _items_ in the combo box will always be your custom data 
structure instances (which you can use in #setSelectedItem(Object), for 
instance; or returned by #getSelectedItem()), and the renderer controls how 
they're displayed.

In addition -- I believe I've already seen something like this coded somewhere 
-- you can write your own custom model (<http://docs.oracle.com/javase/6/docs/api/javax/swing/ComboBoxModel.html>)
and have that hook directly to the database, possibly with on-demand, 
lightweight loading of data.

HTH,
--
DF.

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