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Editorial Team
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Asked: 2026-05-19T01:38:53+00:00

I’m pretty new to java, and using netbeans for design a UI. What I

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I’m pretty new to java, and using netbeans for design a UI.

What I am trying to do is…

in the form. there are a jComboBox and a JTextField, where user can input the service he is choosing and an observation. So far so good. JComboBox is populated from database entries.

The problem is, a user can input N different services at once (there are too much to be a bunch of checkboxes). I was thinking into add a “[+]” button (along with a “[-]” for removal). Thus, users click on [+] and another new line with a jcombobox + jtextfield appear right below the previous ones.

I’m stucked at this point. On [+] button ActionPerformed I just can’t clone and add previous nodes. Any idea on how proceed.

My background is webdev. Doing this with javascript would be really quick. Well, I think you already know what I’m trying to do. Waiting for some light. Thx.

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1 Answer

  1. Editorial Team

    You’re on the right track. Here’s some source code to give you some ideas
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    The basic idea is that the EntryList is responsible for keeping track of the rows to display; each row has a plus/minus button, and then delegates out the actual adding/removing to this EntryList. It also exposes methods to disable the minus/plus button so that the list view can ensure that you don’t remove a single entry (so that you don’t have an empty display)

    This doesn’t work perfectly; you’ll notice you need to resize the frame to get the new rows to show up correctly. But this should be enough to get you started.

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