List Model Controls - The Definitive Guide to Java Swing - page 468

JList jlist = new JList(labels);
JScrollPane scrollPane1 = new JScrollPane(jlist);
frame.add(scrollPane1, BorderLayout.WEST);
final JTextArea textArea = new JTextArea();
textArea.setEditable(false);
JScrollPane scrollPane2 = new JScrollPane(textArea);
frame.add(scrollPane2, BorderLayout.CENTER);
ListSelectionListener listSelectionListener =
new ListSelectionListener() {
public void valueChanged(ListSelectionEvent listSelectionEvent) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
pw.print("First index: " + listSelectionEvent.getFirstIndex());
pw.print(", Last index: " + listSelectionEvent.getLastIndex());
boolean adjust = listSelectionEvent.getValueIsAdjusting();
pw.println(", Adjusting? " + adjust);
if (!adjust) {
JList list = (JList)listSelectionEvent.getSource();
int selections[] = list.getSelectedIndices();
Object selectionValues[] = list.getSelectedValues();
for (int i=0, n=selections.length; i<n; i++) {
if (i==0) {
pw.print(" Selections: ");
}
pw.print(selections[i] + "/" + selectionValues[i] + " ");
}
pw.println();
}
textArea.append(sw.toString());
}
};
jlist.addListSelectionListener(listSelectionListener);
frame.setSize(350, 200);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
■ Note If you know that a JList is in single-selection mode, you can get the currently selected item with
either the selectedIndex or selectedValue property.