jlist | Python list replacement

I'm trying to write a kanban board. But if there are two and more stickers in one column, often the JToolBar with buttons will be shown only if you click on a sticker in this column for the firs time. I thought that there were some problems with coordinates, but I didn't found it. The StickerListener responds th event, even prints "условие работает" if coordinates are correct, but the JToolBar remainds invisible.

I have looked at other questions that seem to be similar to this one, however the difference is that in this case I have no selectedIndex.

I am trying to delete an element from a JList while looping through a for loop. To find out which element I want to delete, I do a comparison of a tooltip I have defined, and delete only that element.

Ok, I had a very specific problem. I had a panel with a JTextField and a JTextPane (actually 2 JTextPane, but I had only one active) and needed an event to update the relative variables in the caller form when the user was done editing the text.

JTextPane is set with a StyledDocument, therefore, I can't afford to update its variable every single time I press a key, therefore using DocumentListener was not viable.

And using FocusListener was not a solution either, because the variable (couple) was selected using a JList component and it changed the reference before FocusLost was changed. In short, other components were interferring with the variable instance.

This is how I solved the problem.

First of all I created an InputVerifier:

I've got a JList whose elements consist of image files for which I'm creating thumbnails (in a background Thread). When these thumbnails become available, I'd like to force a repaint of just that item. However, I find that when I use the listModel's fireDataChanged method (see below), all the visible items in the list are repainted (using my custom ListCellRenderer).

I'm experimenting with 2D painting in Swing, and I'd like to paint a JLabel in the middle of an empty JList.
Thus I came up with:

Main Class

I have made two JScrollPane components. The left one shows the directories in USB and right shows the directories of a local drive. For I am able to display the complete file path as shown in first pic. But I want to display it with icons just like the way directories are displayed in any local drive on PC. This is my designed GUI, here is the example of what I want example

public class MainForm extends javax.swing.JFrame { iRecordCopy obj = new iRecordCopy();

I am new to Swing and I didn't find enough tutorial to learn it properly. So I start to learn by doing. I tried the following code:-

I have a swing GUI with a JList inside a JScrollPane and I've populated it with Strings. I want to get the selected String from the list but everytime it returns -1. I had also made selection listeners which didn't work. Looked up other ones from posts here but the listener is never fired no matter how much I click. Single selection mode is selected. Here's the button method. Value is null, index is -1.