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Jcombobox with Jcheckboxes

how can I create (with JAVA) Combobox that contains Checkboxes for multiple selection and display the selected items in the Combobox like this picture:
click to see the pic
and thnx for advance.
EDIT:
I found this API (JAPURA API) and it's great but when I select multiple things I want to display the selected items instead of "* multiple items *".

Here's the link to achieve your goal:
JComboBox Providing a Custom Renderer

I would suggest you create a JButton and style it in the form of a Combobox if you want that.
Then, at the onclick function (actionperformed), you create a JPanel and make it visible under the button. In the panel, you can put whatever you want, so you just put checkboxes there.
I know this is kind of a workaround of your problem, but it should be easy for you to do so, and the actual user does not see a difference at all.
Hope I could help you.
Cheers,
Lucky

how to set text to a jcombobox, but the text set should not be an element of jcombobox

is their any way to set text for a combo box, which is not an element of the combobox.
cboSubjects=new JComboBox();
cbo.addItem("Maths"); // and few more subjects are added
cbo.setSelectedItem("subjects"); // this does not set the default text of combobox
Is their any way to solve this problem ? I need something which works like combobox.text
property of combobox in visual basic
I am working on school management system. I need help.

I'd like to show you a possible alternative :)
Note, you need to call label.setDisplayedMnemonic('s'); and label.setLabelFor(combo) to complete the effect!

You can make jComboBox editable, cbo.setEditable(true);, and after that set the text you want: cbo.setSelectedItem("subjects");

How to prevent JComboBox from closing?

After selecting an item from a JComboBox, i want to keep the JComboBox still opened to allow the user to choose another item from it. Is that possible ?
I hope you can provide me an example.

Perhaps what you are after is a JList instead.

As a different approach, maybe you can display in the JComboBox only the "allowed to choose" items in first place?

JList with custom cell renderer vs Jtable

My current application uses a JList and everything is well (the only customization I did was to set the italic font on some of the rows).
Now I want to "upgrade" the user interface and instead of just labels in the List, I want a checkbox and a text field to be able to update the entry.
I started changing the code and adding a custom cell renderer and a custom cell model. My current problem is that the JPanel that the cell renderer is returning is not using the whole width of the container, so several list items are actually shown on the same line.
But now, I am wondering whether I should just change the whole thing to use JTable. I still need to add / remove items in the list though...
Any suggestion which one is better ? and if going with the JList, how should I go about fixing my current problem ?

In my experience using JTable is usually easier as it allows more complex data and functionality out-of-the-box. Usually when I try to do something the JList can't do, I just switch to JTable without a second thought. What you want sounds like something that should be pretty trivial to implement in a table. I suggest you try it out with some mock data to see if you can make it look and work the way you like (especially in case you want it to look like a list).

Try calling setLayoutOrientation(JList.VERTICAL) on your JList. That will restrict JList to a single column.

Java Swing: what class can be used to implement this?

What Swing class can I use to implement something like this?
Add To List http://img22.imageshack.us/img22/3260/swingwidget.jpg
EDIT: Hmm..for some reason I cannot add the image here. Well, here's the link:
Basically, I need a list table, where each column can be of different type of gui (i.e. plain text, check box, or drop-down menu).
EDIT I have re-publish the image for you ;)

You would use a JTable to implement it. Your data will be stored in a TableModel. The DefaultTableCellRenderer and DefaultTableCellEditor should do what you need, but you can also customize the rendering/behavior if necessary.
More info on renderers/editors: http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#editrender

Definitely JTable.
JTable allow you to define what render will have each column. That way you can add checkboxes, combos, textfields etc. to it.
Here's an screenshot:
alt text http://img43.imageshack.us/img43/9430/jtable.png
You can read more about it here: How to use Tables

JTable will do this for you, you're going to need to understand the MVC pattern pretty well to acheive this as you will need a custom model and renderer, but once you get the hang of it its not too hard.
David gearys book "Graphic Java Vol.2" has an excellent section on JTable, whilst this book is now fairly old I still personally think thats the best explanation of JTable I've seen.