Exercise 1

1)
The tooltip can be inserted by inserting a 
	selText.setToolTipText("type part of the name here to filter the list");
just after the lines
	// and the text field	
	selText = new JTextField( 12 );
Notice, in the beginning of the JToolTip class API, there is a link "How to Use Tool Tips".
Following this brings an example which is the one which can be used.

2)
In the class MyWindow, the lines:

	final SelectingList students = new SelectingList(OOPStudent.students);
	this.getContentPane().add( students, "West");

	final OOPStudentDelegate sd = new OOPStudentDelegate();
	getContentPane().add( (Component)sd, "Center");

Are replaced by:
	final SelectingList students = new SelectingList(OOPStudent.students);
	//this.getContentPane().add( students, "West");

	final OOPStudentDelegate sd = new OOPStudentDelegate();
	//getContentPane().add( (Component)sd, "Center");
	
	JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, students, sd);
	splitPane.setOneTouchExpandable(true);
	splitPane.setDividerLocation(150);
	this.getContentPane().add( splitPane);


Exercise 2

The line 
		new Thread( new InsertHaHa( document ) ).start();

is replaces by:
		// ex 2.1
		final Timer timer = new Timer(3000, new ActionListener(){
			public void actionPerformed(ActionEvent e){
				try{
					document.insertString(0, "HaHa", null);
				}catch(Exception nono){}
			}
		});
		// ex 2.2 - is solved using the API functions
		timer.setInitialDelay(10000);

		// ex 2.3 - is solved using the API functions
		//timer.setInitialDelay(15000);
		//timer.setRepeats(false);


		// ex 2.4
		// create the slider with an anonymous ChangeListener inside. 
		// The interval of the slider is 1/2 to 15 seconds.
		JSlider slider = new JSlider(JSlider.HORIZONTAL, 500, 15000, 3000);
	        slider.addChangeListener(new ChangeListener(){
        		public void stateChanged(ChangeEvent e) {
			    JSlider source = (JSlider)e.getSource();
			    if (!source.getValueIsAdjusting()) {
			        int newDelay = (int)source.getValue();
					timer.setDelay(newDelay);
			    }
		}});
		c.add(slider);

		timer.start();