Acho que é melhor colocar o código completo:
Aqui está!
[code]import java.awt.;
import java.awt.event.;
import java.io.;
import java.util.ArrayList;
import javax.sound.midi.;
import javax.swing.*;
public class BeatBox {
JPanel mainPanel;
ArrayList<JCheckBox> checkboxList;
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
String[] instrumentNames = { "Bumbo", "Hi-Hat Fechado", "Hi-Hat Aberto",
"Caixa Acústica", "Cymbal Quebrado", "Bater Palmas", "Tom Grave",
"Hi Bongo", "Maracas", "Apito", "Conga Grave", "Cowbell",
"Vibraslap", "Tom Médio-Grave", "Agogo Alto", "Hi Conga Aberto" };
int[] instruments = { 35, 42, 46, 38, 49, 39, 50, 60, 70, 72, 64, 56, 58,
47, 67, 63 };
public static void main(String[] args) {
new BeatBox().buildGUI();
}
private void buildGUI() {
theFrame = new JFrame("Cyber BeatBox");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout layout = new BorderLayout();
JPanel background = new JPanel(layout);
background.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
checkboxList = new ArrayList<JCheckBox>();
Box buttonBox = new Box(BoxLayout.Y_AXIS);
JButton start = new JButton("Start");
start.addActionListener(new MyStartListener());
buttonBox.add(start);
JButton stop = new JButton("Stop");
stop.addActionListener(new MyStopListener());
buttonBox.add(stop);
JButton upTempo = new JButton("Tempo Up");
upTempo.addActionListener(new MyUpTempoListener());
buttonBox.add(upTempo);
JButton downTempo = new JButton("Tempo Down");
downTempo.addActionListener(new MyDownTempoListener());
buttonBox.add(downTempo);
JButton serialize = new JButton("SerializeIt");
serialize.addActionListener(new MySendListener());
buttonBox.add(serialize);
JButton restore = new JButton("Restore");
restore.addActionListener(new MyReadInListener());
buttonBox.add(restore);
JButton open = new JButton("Open a File");
open.addActionListener(new OpenMenuListener());
buttonBox.add(open);
Box nameBox = new Box(BoxLayout.Y_AXIS);
for (int i = 0; i < 16; i++) {
nameBox.add(new Label(instrumentNames[i]));
}
background.add(BorderLayout.EAST, buttonBox);
background.add(BorderLayout.WEST, nameBox);
theFrame.getContentPane().add(background);
GridLayout grid = new GridLayout(16, 16);
grid.setVgap(1);
grid.setHgap(2);
mainPanel = new JPanel(grid);
background.add(BorderLayout.CENTER, mainPanel);
for (int i = 0; i < 256; i++) {
JCheckBox c = new JCheckBox();
c.setSelected(false);
checkboxList.add(c);
mainPanel.add(c);
}
setUpMidi();
theFrame.setBounds(50, 50, 300, 300);
theFrame.pack();
theFrame.setVisible(true);
}
public void setUpMidi() {
try {
sequencer = MidiSystem.getSequencer();
sequencer.open();
sequence = new Sequence(Sequence.PPQ, 4);
track = sequence.createTrack();
sequencer.setTempoInBPM(120);
} catch (Exception e) {
e.printStackTrace();
}
}
public void buildTrackAndStart() {
int[] trackList = null;
sequence.deleteTrack(track);
track = sequence.createTrack();
for (int i = 0; i < 16; i++) {
trackList = new int[16];
int key = instruments[i];
for (int j = 0; j < 16; j++) {
JCheckBox jc = (JCheckBox) checkboxList.get(j + (16 * i));
if (jc.isSelected()) {
trackList[j] = key;
} else {
trackList[j] = 0;
}
}
makeTracks(trackList);
track.add(makeEvent(176, 1, 127, 0, 16));
}
track.add(makeEvent(192, 9, 1, 0, 15));
try {
sequencer.setSequence(sequence);
sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);
sequencer.start();
sequencer.setTempoInBPM(120);
} catch (Exception e) {
e.printStackTrace();
}
}
class MyStartListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
buildTrackAndStart();
}
}
class MyStopListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
sequencer.stop();
}
}
class MyUpTempoListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float) (tempoFactor * 1.03));
}
}
class MyDownTempoListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float) (tempoFactor * 0.97));
}
}
public void makeTracks(int[] list) {
for (int i = 0; i < 16; i++) {
int key = list[i];
if (key != 0) {
track.add(makeEvent(144, 9, key, 100, i));
track.add(makeEvent(128, 9, key, 100, i + 1));
}
}
}
public MidiEvent makeEvent(int comd, int chan, int one, int two, int tick) {
MidiEvent event = null;
try {
ShortMessage a = new ShortMessage();
a.setMessage(comd, chan, one, two);
event = new MidiEvent(a, tick);
} catch (Exception e) {
e.printStackTrace();
}
return event;
}
public class MySendListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
boolean[] checkboxState = new boolean[256];
for (int i = 0; i < 256; i++) {
JCheckBox check = (JCheckBox) checkboxList.get(i);
if (check.isSelected()) {
checkboxState[i] = true;
}
}
try {
FileOutputStream fileStream = new FileOutputStream(new File(
"Checkbox.ser"));
ObjectOutputStream os = new ObjectOutputStream(fileStream);
os.writeObject(checkboxState);
JFileChooser fileSave = new JFileChooser();
fileSave.showSaveDialog(theFrame);
saveFile(fileSave.getSelectedFile());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
private void saveFile(File file) {
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(file));
writer.close();
} catch (IOException ex) {
System.out.println("Couldn't write the File");
ex.printStackTrace();
}
}
public class MyReadInListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
boolean[] checkboxState = null;
try {
FileInputStream fileIn = new FileInputStream(new File(
"Checkbox.ser"));
ObjectInputStream is = new ObjectInputStream(fileIn);
checkboxState = (boolean[]) is.readObject();
} catch (Exception ex) {
ex.printStackTrace();
}
for (int i = 0; i < 256; i++) {
JCheckBox check = (JCheckBox) checkboxList.get(i);
if (checkboxState[i]) {
check.setSelected(true);
} else {
check.setSelected(false);
}
}
sequencer.stop();
buildTrackAndStart();
}
}
public class OpenMenuListener implements ActionListener {
public void actionPerformed(ActionEvent ev) {
JFileChooser fileOpen = new JFileChooser();
fileOpen.showOpenDialog(theFrame);
loadFile(fileOpen.getSelectedFile());
}
}
public void loadFile(File file) {
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
reader.close();
} catch (IOException ex) {
System.out.println("Couldn't read the file");
ex.printStackTrace();
}
}
}[/code]
Eu acho que realmente leio e gravo em um arquivo as seqüências de cada JCheckBox(métodos loaFile() e saveFile()). Mas na hora de restaurar a GUI para o padrão do arquivo, isso não acontece. Acho que preciso fazer algo a mais no método loadFile(), só não sei o que é.