— Scott McNealy, Sun Microsystems Chairman, President and ceo

2
Register a listener for the events
3
Start the sequencer playing
4
Each time the listener’s event 
handler method is called, draw a 
random rectangle on the drawing 
panel, and call repaint.
1
Version One: Code that simplifies mak-
ing and adding MIDI events, since we’ll 
be making a lot of them.
We’ll build it in three iterations:
2
Version Two: Register and listen for 
the events, but without graphics. 
Prints a message at the command-line 
with each beat.
4
Version Three: The real deal. Adds 
graphics to version two.

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chapter 12
ShortMessage a = new ShortMessage();
a.setMessage(144, 1, note, 100);
MidiEvent noteOn = new MidiEvent(a, 1); 
track.add(noteOn);
ShortMessage b = new ShortMessage();
b.setMessage(128, 1, note, 100);
MidiEvent noteOff = new MidiEvent(b, 16); 
track.add(noteOff);
Right now, making and adding messages and 
events to a track is tedious. For each message, 
we have to make the message instance (in this 
case, ShortMessage), call setMessage(), make a 
MidiEvent for the message, and add the event 
to the track. In last chapter’s code, we went 
through each step for every message. That 
means eight lines of code just to make a note 
play and then stop playing! Four lines to add a 
NOTE ON event, and four lines to add a NOTE 
OFF event. 
An easier way to make 
messages / events
1
Make a message instance
ShortMessage first = new ShortMessage();
Things that have to happen for 
each event:
2
Call setMessage() with the instructions