AWT MOUSE EVENT

AWTEvent.MOUSE_EVENT_MASK
// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski. Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.AWTEvent;
import java.awt.AWTEventMulticaster;
import java.awt.Component;
import java.awt.Frame;
import java.awt.ItemSelectable;
import java.awt.SystemColor;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
class ItemEventComponent extends Component implements ItemSelectable
{
boolean selected;
int i = 0;
ItemListener itemListener = null;
ItemEventComponent()
{
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
public Object[] getSelectedObjects()
{
Object o[] = new Object[1];
o[0] = new Integer(i);
return o;
}
public void addItemListener(ItemListener l)
{
itemListener = AWTEventMulticaster.add(itemListener, l);
}
public void removeItemListener(ItemListener l)
{
itemListener = AWTEventMulticaster.remove(itemListener, l);
}
public void processEvent(AWTEvent e)
{
if (e.getID() == MouseEvent.MOUSE_PRESSED)
{
if (itemListener != null)
{
selected = !selected;
i++;
itemListener.itemStateChanged(new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED,
getSelectedObjects(),
(selected ? ItemEvent.SELECTED : ItemEvent.DESELECTED)));
}
}
}
}
public class MainClass extends Frame implements ItemListener
{
MainClass() {
super("Listening In");
ItemEventComponent c = new ItemEventComponent();
add(c, "Center");
c.addItemListener(this);
c.setBackground(SystemColor.control);
setSize(200, 200);
}
public void itemStateChanged(ItemEvent e)
{
Object[] o = e.getItemSelectable().getSelectedObjects();
Integer i = (Integer) o[0];
System.out.println(i);
}
public static void main(String args[])
{
MainClass f = new MainClass();
f.show();
}