In the following example, you remove a component in the mouseReleased
method.  Clicking in the component correctly removes the component
but also sends a MOUSE_CLICKED event to the parent!  This causes big problems
for Swing apps because the menus are lightweight components, and the 
components under the menus which receive the clicked events may be
things like toolbar buttons which delete the current selection...

import java.awt.*;
import java.awt.event.*;

public class r2 extends Frame
{
    public r2() {
	// Create mouse listener which prints out mouse events
	TestMouseListener ml = new TestMouseListener();
	setSize(150,150);
	// Create panel
	Container p = (Container)add(new Container() {});
	p.setName("parent");
	p.setLayout(null);
	p.addMouseListener(ml);

	Component red = p.add(new Component() {
	    public void paint(Graphics g) {
		Rectangle r = getBounds();
		Color c = getBackground();
		g.setColor(c);
		g.fillRect(r.x, r.y, r.width, r.height);
	    }
	});
	red.setName("child");
	red.setBackground(Color.red);
	red.setBounds(25,25,75,75);

	/* extend the 'printout' mouse listener so that a
	 * mouse release removes the panel from its parent
	 */
	red.addMouseListener(new TestMouseListener() {
	    public void mouseReleased(MouseEvent e) {
		super.mouseReleased(e);
		Component c = (Component)e.getSource();
		Container parent = c.getParent();
		parent.remove(c);
		parent.repaint();
	    }
	});
    }


    /*   This listener class prints out the name of the event source
     *   and the type of the event for mouse events on the component
     */

    class TestMouseListener implements MouseListener {
	public void mouseEntered(MouseEvent e) {
	    Component c = (Component)e.getSource();
	    System.out.println(c.getName() + " - mouseEntered");
	}
	public void mouseExited(MouseEvent e) {
	    Component c = (Component)e.getSource();
	    System.out.println(c.getName() + " - mouseExited");
	}
	public void mousePressed(MouseEvent e) {
	    Component c = (Component)e.getSource();
	    System.out.println(c.getName() + " - mousePressed ");
	}
	public void mouseReleased(MouseEvent e) {
	    Component c = (Component)e.getSource();
	    System.out.println(c.getName() + " - mouseReleased ");
	}
	public void mouseClicked(MouseEvent e) {
	    Component c = (Component)e.getSource();
	    System.out.println(c.getName() + " - mouseClicked");
	    Thread.dumpStack();
	}
    }
    

    public static void main(String s[]) {
         WindowListener l = new WindowAdapter() {
             public void windowClosing(WindowEvent e) {System.exit(0);}
             public void windowClosed(WindowEvent e) {System.exit(0);}
         };
 
         Frame f = new r2();
         f.addWindowListener(l);
         f.show();
    }

}



Here is a trace from going into the red square and clicking:

bash$ m r2
/usr/local/java/jdk1.1.6/solaris/bin/javac -classpath .:/export/home/swing1.2/build/solaris/1.1_classes:/usr/local/java/jdk1.1.6/solaris/lib/classes.zip r2.java
/usr/local/java/jdk1.1.6/solaris/bin/java -classpath .:/export/home/swing1.2/build/solaris/1.1_classes:/usr/local/java/jdk1.1.6/solaris/lib/classes.zip r2
parent - mouseEntered
parent - mouseExited
child - mouseEntered
child - mousePressed 
child - mouseReleased 
parent - mouseEntered
parent - mouseClicked
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java)
        at r2$TestMouseListener.mouseClicked(r2.java:67)
        at java.awt.Component.processMouseEvent(Component.java:2407)
        at java.awt.Component.processEvent(Component.java:2249)
        at java.awt.Container.processEvent(Container.java:878)
        at java.awt.Component.dispatchEventImpl(Component.java:1781)
        at java.awt.Container.dispatchEventImpl(Container.java:923)
        at java.awt.Component.dispatchEvent(Component.java:1708)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:1559)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:1470)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:1395)
        at java.awt.Container.dispatchEventImpl(Container.java:910)
        at java.awt.Window.dispatchEventImpl(Window.java:492)
        at java.awt.Component.dispatchEvent(Component.java:1708)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:81)
parent - mouseExited




Note that this happens in 1.1.X and 1.2 all versions.  This is bad.