Error adding array to jComboBox

Hi

I am trying to add an an array to a jComboBox but I cannot get the combo box list to display, the first value is displayed in the top field and the drop down does not open.

The array is an array of objects, I am trying to load a specific field from the objects in the array.

The code I am using is as follows:

roundsStockObj   //an array of objects, I want to use the .getDescription() field from each object and load to the combobox, this field is a string of the product description.

DefaultComboBoxModel model = (DefaultComboBoxModel)main.roundStockPanel.cmbRoundStockList.getModel();

            for (int d = 0; d < roundsStockObjData.length; d++) {
               
                model.addElement(new Object[]{roundsStockObj[d].getDescription()});
             
            }

The array is there, I can see the values if I test in a text box and iterate through. But when I run the above I get a value in the top field as follows:

{Ljava.lang.Object;@92a4dd

So in summary, I think I have two issues here, firstly the combo box is not being populated with the correct data, and secondly the drop down does not work, only one value is displayed (albeit incorrect) and the drop down function to display the list doesnt work...

Any help you can give would be hugley appreciated as I am completely stuck until I resolve this.

Thanks
BinaryFlusherAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

for_yanCommented:
It looks like you are adding an array as each element of the model, that's why you see the toString() method of the whole array displayed. You should add individual objects to each element - not arrays
0
for_yanCommented:
You probabky used [] brackets instead of () parentheses after new Object - please check
0
for_yanCommented:
You probabky used [] brackets instead of () parentheses after new Object - please check
0
Why Diversity in Tech Matters

Kesha Williams, certified professional and software developer, explores the imbalance of diversity in the world of technology -- especially when it comes to hiring women. She showcases ways she's making a difference through the Colors of STEM program.

Read More
BinaryFlusherAuthor Commented:
Hi for_yan

I have amended the code as follows, to create an arrray of objects that I then pass the individual value to the combox inside the for loop.

            Object[] items = new Object[roundStockObj.length];
            for (int d = 0; d < roundsData.length; d++) {
                items[d] = roundStockObj[d].getDescription();
                model.addElement(items[d]);

            }

This seems to be a bit closer, I now get a proper value in the top field for the combo box, however this valiue is the first in the array and I still cannot get the drop down to open or diosplay the other values...

Any ideas?
0
for_yanCommented:
This is really strange. Could it happen that you have only one roundStock object? If it added one - why should not it add more of them?
Put a printout of item descriptions before you are adding them.

If I don't need anything sophisticted, I usually just use JComboBox(Vector) constructor - don't even need to think much about models  
0
BinaryFlusherAuthor Commented:
If the combo box is already instantiated, how best can I add the array to the combo box, as in not using the constructor?
0
CEHJCommented:
You can simplify that code to the below: you're only adding the description string as the element at the moment anyway
for (int d = 0; d < roundsData.length; d++) {
            model.addElement(roundStockObj[d].getDescription());
        }

Open in new window

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
BinaryFlusherAuthor Commented:
Just for your info, I tested with text boxes and the data was being populated correctly, as I expected.

After experimenting woth some of the component properties, I found that uncheking the "lightWeightPopup" value, so changing to a heavyweight popup the display now works as expected.

Very strange and very frustrating...

Thanks for your help though.
0
CEHJCommented:
>>If the combo box is already instantiated, how best can I add the array to the combo box, as in not using the constructor?

Just create a new model and use the code i just posted above
0
CEHJCommented:
:)
0
Mick BarryJava DeveloperCommented:
thats a poor solution, you have no way of knowing which objects are in your list
you should instead use a custom renderer
0
Mick BarryJava DeveloperCommented:
>             model.addElement(roundStockObj[d].getDescription());

And thats also just copying what for_yan had already suggested, so you should have accepted his comment.

for_yan>  You should add individual objects to each element - not arrays

0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Java

From novice to tech pro — start learning today.