Hi,
I have used the following code (this is from HeadFirst Java Book)
import java.awt.*;
import javax.swing.*;
import javax.sound.midi.*;
import java.util.*;
import java.awt.event.*;
public class BeatBox {
JPanel mainPanel;
ArrayList<JCheckBox> checkboxList;
Sequence sequence;
Sequencer sequencer;
Track track;
JFrame theFrame;
String[] instrumentNames = {"Bass Drum", "Closed Hi-Hat", "Open Hi-Hat", "Acoustic Snare", "Crash Cymbal", "Hand Clap", "High Tom", "High Bongo", "Maracas", "Whistle", "Low Conga", "Cowbell", "Vibraslap", "Low-mid Tom", "High Agogo", "Open Hi Conga"};
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();
}
public 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");
start.addActionListener(new MyStopListener());
buttonBox.add(stop);
JButton upTempo = new JButton("Tempo Up");
start.addActionListener(new MyUpTempoListener());
buttonBox.add(upTempo);
JButton downTempo = new JButton("Tempo Down");
start.addActionListener(new MyDownTempoListener());
buttonBox.add(downTempo);
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();
checkboxList.add(c);
mainPanel.add(c);
//end loop
}
setUpMidi();
theFrame.setBounds(50,50,300,300);
theFrame.pack();
theFrame.setVisible(true);
//close method
}
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();
}
//close method
}
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;
}
} //close inner loop
makeTracks(trackList);
track.add(makeEvent(176,1,127,0,16));
} //close outer loop
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();
}
}//close buildTrackListAndStart method
public class MyStartListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
buildTrackAndStart();
}
}//close inner class
public class MyStopListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
sequencer.stop();
}
}//close inner class
public class MyUpTempoListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*1.03));
}
}//close inner class
public class MyDownTempoListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*.97));
}
}//close inner class
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;
}
}I have compiled the application with no errors. I have made a jar with manifest file containing the following:
Main-Class: BeatBoxMy code file is: E:\BeatBox\BeatBox.java and the class files are also in the same folder.
When I try to execute the jar file, I get an error: Could not find the main class: BeatBox.
Please guide me as to how I can get my app running.
Thanks!