As @Andreas_D said, the data centered, more abstract ListModel is the solution. This can be a DefaultListModel. You should explicitly set the model in the JList.
So (thanks to comment by @kleopatra):
DefaultListModel model = (DefaultListModel) jlist.getModel();
int selectedIndex = jlist.getSelectedIndex();
if (selectedIndex != -1) {
model.remove(selectedIndex);
}
There are several remove...
methods in DefaultListModel.
By the way, this is a good question, as there is no immediate solution in the API (ListModel).
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