linking jcombobox values with jtextfield values

I've created an application in netbeans IDE 6.9 where I need to set values for each value in the jcombobox. In my pane I've a combobox and below that are the textfields for entering values for each value in the combobox. Can anyone suggest that how do I link the combobox with textfield. I mean there are different values for each value in the combobox. I want that user selects a value in the combobox then its corresponding value should be displayed(if it has already been entered) otherwise a blank space should be shown. I want that all the values for each combobox values should be set in one go(the user should not press the ok button). -Thanks in advance