Estou tendo problemas para executar a classe abaixo (ela foi retirada do livro “Use a cabeça! Java”):
package exemplos;
import javax.sound.midi.*;
public class MiniMusicCmdLine {
public static void main(String[] args) {
MiniMusicCmdLine mini = new MiniMusicCmdLine();
if(args.length < 2){
System.out.println("Não se esqueça dos argumentos do instrumento e da nota");
}else{
int instrument = Integer.parseInt(args[0]);
int note = Integer.parseInt(args[1]);
mini.play(instrument, note);
}
}
public void play(int instrument, int note){
try{
Sequencer player = MidiSystem.getSequencer();
player.open();
Sequence seq = new Sequence(Sequence.PPQ, 4);
Track track = seq.createTrack();
//MidiEvent event = null;
ShortMessage first = new ShortMessage();
first.setMessage(192, 1, instrument, 0);
MidiEvent changeInstrument = new MidiEvent(first, 1);
track.add(changeInstrument);
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, 1);
track.add(noteOff);
player.setSequence(seq); //Coloca o CD no CD Player.
player.start(); //Pressiona "play".
}catch(Exception ex){
ex.printStackTrace();
}
}
}
