How to use? about wmn4j HOT 4 CLOSED

ScoreBuilder sb = new ScoreBuilder();
sb.addPart(new PartBuilder("melody")
        .add(new MeasureBuilder()
                .setClef(Clef.of(Symbol.G, 2)) // I don't know which line this is supposed to center on
                .setTimeSignature(TimeSignature.of(4, 4))
                .addToVoice(0, new RestBuilder(Duration.of(1, 4)))
                .addToVoice(0, new NoteBuilder(Pitch.of(Pitch.Base.C, Pitch.Accidental.NATURAL, 4), Duration.of(1, 4)))
                .addToVoice(0, new ChordBuilder(Arrays.asList(
                        new NoteBuilder(Pitch.of(Pitch.Base.C, Pitch.Accidental.NATURAL, 4), Duration.of(1, 2)),
                        new NoteBuilder(Pitch.of(Pitch.Base.E, Pitch.Accidental.NATURAL, 4), Duration.of(1, 2)),
                        new NoteBuilder(Pitch.of(Pitch.Base.G, Pitch.Accidental.NATURAL, 4), Duration.of(1, 2))
                )))
        )
);
Score score = sb.build();
try {
    MusicXmlWriter.writerFor(score, new File("example.xml").toPath()).write();
} catch (IOException ex) {
    Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
}