Java Tutorial/Swing Event/ListDataListener

implements ListDataListener

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.DefaultListModel; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; class MyListDataListener implements ListDataListener {

 public void contentsChanged(ListDataEvent e) {
     System.out.println("contentsChanged: " + e.getIndex0() +
                ", " + e.getIndex1()); 
 }
 public void intervalAdded(ListDataEvent e) {
   System.out.println("intervalAdded: " + e.getIndex0() +
                ", " + e.getIndex1()); 
 }
 public void intervalRemoved(ListDataEvent e) {
   System.out.println("intervalRemoved: " + e.getIndex0() +
                ", " + e.getIndex1()); 
 }

}

public class UsingListDataListener {

 static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
 public static void main(String args[]) {
   JFrame frame = new JFrame("Modifying Model");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   // Fill model
   final DefaultListModel model = new DefaultListModel();
   
   model.addListDataListener(new MyListDataListener());
   for (int i = 0, n = labels.length; i < n; i++) {
     model.addElement(labels[i]);
   }
   JList jlist = new JList(model);
   
   JScrollPane scrollPane1 = new JScrollPane(jlist);
   frame.add(scrollPane1, BorderLayout.CENTER);
   frame.setSize(640, 300);
   frame.setVisible(true);
 }

}</source>

Using ListDataListener to listen

   <source lang="java">

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.DefaultListModel; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.event.ListDataEvent; import javax.swing.event.ListDataListener; public class ModifyModelSampleListDataListener {

 static String labels[] = { "A", "B", "C", "D", "E", "F", "G" };
 public static void main(String args[]) {
   JFrame frame = new JFrame("Modifying Model");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   // Fill model
   final DefaultListModel model = new DefaultListModel();
   for (int i = 0, n = labels.length; i < n; i++) {
     model.addElement(labels[i]);
   }
   JList jlist = new JList(model);
   JScrollPane scrollPane1 = new JScrollPane(jlist);
   frame.add(scrollPane1, BorderLayout.CENTER);
   
   ListDataListener listDataListener = new ListDataListener() {
     public void contentsChanged(ListDataEvent listDataEvent) {
       appendEvent(listDataEvent);
     }
     public void intervalAdded(ListDataEvent listDataEvent) {
       appendEvent(listDataEvent);
     }
     public void intervalRemoved(ListDataEvent listDataEvent) {
       appendEvent(listDataEvent);
     }
     private void appendEvent(ListDataEvent listDataEvent) {
       switch (listDataEvent.getType()) {
       case ListDataEvent.CONTENTS_CHANGED:
         System.out.println("Type: Contents Changed");
         break;
       case ListDataEvent.INTERVAL_ADDED:
         System.out.println("Type: Interval Added");
         break;
       case ListDataEvent.INTERVAL_REMOVED:
         System.out.println("Type: Interval Removed");
         break;
       }
       System.out.println(", Index0: " + listDataEvent.getIndex0());
       System.out.println(", Index1: " + listDataEvent.getIndex1());
       DefaultListModel theModel = (DefaultListModel) listDataEvent.getSource();
       System.out.println(theModel);
     }
   };
   model.addListDataListener(listDataListener);
   
   JButton jb = new JButton("add F");
   jb.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent actionEvent) {
       model.add(0, "First");
     }
   });
   
   frame.add(jb,BorderLayout.SOUTH);    
   
   frame.setSize(640, 300);
   frame.setVisible(true);
 }

}</source>