import java.awt.BorderLayout;

import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class ListenElementErmitteln implements ListSelectionListener {

    JList<String> liste;

    public ListenElementErmitteln() {

        DefaultListModel<String> model = new DefaultListModel<String>();
        model.addElement("eins");
        model.addElement("zwei");
        model.addElement("drei");
        liste = new JList<String>(model);
        liste.addListSelectionListener(this);
        JScrollPane sp = new JScrollPane(liste);

        JFrame frame = new JFrame("Listenelement ermitteln");
        frame.getContentPane().add(sp, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocation(200, 200);
        frame.setVisible(true);
    }

    public void valueChanged(ListSelectionEvent e) {
        if (liste.isSelectionEmpty()) {
            return;
        }
        int minIndex = liste.getMinSelectionIndex();
        int maxIndex = liste.getMaxSelectionIndex();
        for (int i = minIndex; i <= maxIndex; i++) {
            if (liste.isSelectedIndex(i) && e.getValueIsAdjusting()) {
                System.out.println(liste.getModel().getElementAt(i));
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new ListenElementErmitteln());
    }
}