Java by API/java.awt/ItemSelectable

implements ItemSelectable

   <source lang="java">

import java.awt.ItemSelectable; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.event.EventListenerList; public class Main {

 public static void main(String[] argv) throws Exception {
   MyComponent component = new MyComponent();
   JFrame f = new JFrame();
   f.add(component);
   f.setSize(300, 300);
   f.setVisible(true);
 }

} class MyComponent extends JTextField implements ItemSelectable {

 protected EventListenerList listenerList = new EventListenerList();
 public Object[] getSelectedObjects() {
   return new String[] { "a", "b", "c" };
 }
 public void addItemListener(ItemListener l) {
   listenerList.add(ItemListener.class, l);
 }
 public void removeItemListener(ItemListener l) {
   listenerList.remove(ItemListener.class, l);
 }
 void fireItemEvent(Object item, boolean sel) {
   ItemEvent evt = new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED, item,
       sel ? ItemEvent.SELECTED : ItemEvent.DESELECTED);
   Object[] listeners = listenerList.getListenerList();
   for (int i = 0; i < listeners.length - 2; i += 2) {
     if (listeners[i] == ItemListener.class) {
       ((ItemListener) listeners[i + 1]).itemStateChanged(evt);
     }
   }
 }

}

 </source>
   
  
 
  

ItemSelectable: getSelectedObjects()

   <source lang="java">

import java.awt.BorderLayout; import java.awt.ItemSelectable; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.JComboBox; import javax.swing.JFrame; public class MainClass {

 public static void main(final String args[]) {
   final String labels[] = { "A", "B", "C", "D", "E" };
   JFrame frame = new JFrame("Selecting JComboBox");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JComboBox comboBox = new JComboBox(labels);
   frame.add(comboBox, BorderLayout.SOUTH);
   ItemListener itemListener = new ItemListener() {
     public void itemStateChanged(ItemEvent itemEvent) {
       int state = itemEvent.getStateChange();
       String stateString = 
         ((state == ItemEvent.SELECTED) ? "Selected" : "Deselected");
       System.out.println("Item: " + itemEvent.getItem());
       System.out.println(", State: " + stateString);
       ItemSelectable is = itemEvent.getItemSelectable();
       System.out.println(", Selected: " + selectedString(is));
     }
   };
   comboBox.addItemListener(itemListener);
   frame.setSize(400, 200);
   frame.setVisible(true);
 }
 static private String selectedString(ItemSelectable is) {
   Object selected[] = is.getSelectedObjects();
   return ((selected.length == 0) ? "null" : (String)selected[0]);
 }  

}

 </source>