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JList selection changed listener

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; public class SelectingJListSample {   public static void main(String args[]) {     String labels[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J" };     JFrame frame = new JFrame("Selecting JList");     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     Container contentPane = frame.getContentPane();     JList jlist = new JList(labels);     JScrollPane scrollPane1 = new JScrollPane(jlist);     contentPane.add(scrollPane1, BorderLayout.WEST);     ListSelectionListener listSelectionListener = new ListSelectionListener() {       public void valueChanged(ListSelectionEvent listSelectionEvent) {         System.out.print("First index: " + listSelectionEvent.getFirstIndex());         System.out.print(", Last index: " + listSelectionEvent.getLastIndex());         boolean adjust = listSelectionEvent.getValueIsAdjusting();         System.out.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) {               System.out.print("  Selections: ");             }             System.out.print(selections[i] + "/" + selectionValues[i] + " ");           }           System.out.println();         }       }     };     jlist.addListSelectionListener(listSelectionListener);     MouseListener mouseListener = new MouseAdapter() {       public void mouseClicked(MouseEvent mouseEvent) {         JList theList = (JList) mouseEvent.getSource();         if (mouseEvent.getClickCount() == 2) {           int index = theList.locationToIndex(mouseEvent.getPoint());           if (index >= 0) {             Object o = theList.getModel().getElementAt(index);             System.out.println("Double-clicked on: " + o.toString());           }         }       }     };     jlist.addMouseListener(mouseListener);     frame.setSize(350, 200);     frame.setVisible(true);   } }