Showing a counter dynamically for JList items highlighted

Question

I have a program that I created for work. This program takes an uploaded file, reads it, and puts the data into a JList in the GUI. The GUI actually has two lists and the user i

Answer 1

Register a ListSelectionListener with your JList.

The listener could simply query how many rows are selected and update the number in the panel to that. Perhaps use getSelectedValues().size().

http://docs.oracle.com/javase/8/docs/api/javax/swing/JList.html#addListSelectionListener-javax.swing.event.ListSelectionListener-