这是我自己的：
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
import javax.sound.midi.*;
import javax.swing.*;
public class BeatBox {
JFrame frame;
Sequencer player;
Sequence seq;
Track track;
JPanel background;
ArrayList<JCheckBox> checkList;
ArrayList<JCheckBox> check = new ArrayList<JCheckBox>();
// the name of instruments
String instrument[] = {"Bass Drum","Closed Hi-Hat",
"Open Hi-Hat","Acoustic Snare","Crash Cymbal","Hand Clap",
"High Tom","Hi Bongo","Maracas","Whistle","Low Conga",
"Cowbell","Vibraslap","Low-mid Tom","High Agogo",
"Open Hi Conga"};
//the key number of instruments
int key[] = {35,42,46,38,49,39,50,60,70,72,64,56,58,47,67,63};
public static void main(String[] args){
BeatBox game = new BeatBox();
game.go();
}
void go(){
Box nameBox = new Box(BoxLayout.Y_AXIS);
for(int i = 0;i < 16;i++){
nameBox.add(new Label(instrument[i]));
}
JButton start = new JButton("start");
start.addActionListener(new StartListener());
JButton stop = new JButton("stop");
stop.addActionListener(new StopListener());
JButton up = new JButton("up");
up.addActionListener(new UpListener());
JButton down = new JButton("down");
down.addActionListener(new DownListener());
Box buttonBox = new Box(BoxLayout.Y_AXIS);
buttonBox.add(start);
buttonBox.add(stop);
buttonBox.add(up);
buttonBox.add(down);
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridLayout grid = new GridLayout(16,16);
grid.setHgap(2);
grid.setVgap(1);
JPanel myPanel = new JPanel();
myPanel.setLayout(grid);
checkList = new ArrayList<JCheckBox>();
for(int i = 0 ; i < 256; i ++){
checkList.add(new JCheckBox());
myPanel.add(checkList.get(i));
checkList.get(i).setSelected(false);
}
background = new JPanel();
background.setLayout(new BorderLayout());
background.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
background.add(BorderLayout.WEST,nameBox);
background.add(BorderLayout.EAST,buttonBox);
frame.getContentPane().add(background);
background.add(myPanel);
frame.setBounds(450,200, 567, 315);
frame.setVisible(true);
makeMidi();
}
void checkAndPlay(){
seq.deleteTrack(track);
track = seq.createTrack();
int[] keynumber = new int[16];
for(int i = 0; i < 16; i++){
for(int j = 0 ; j < 16; j++){
if(((JCheckBox)checkList.get(i*16+j)).isSelected()){
keynumber[j]=key[i];
}
else{
keynumber[j]=0;
}
}
makeTraceAndAdd(keynumber);
}
}
void makeTraceAndAdd(int[] key){
for(int i = 0 ; i < 16 ;i++){
if(key[i]!=0){
MidiEvent e1 = makeEvent(144,1,key[i],100,i);
MidiEvent e2 = makeEvent(128,1,key[i],100,i);
track.add(e1);
track.add(e2);
track.add(makeEvent(192,9,1,0,15));
}
}
try {
player.setSequence(seq);
player.setLoopCount(Sequencer.LOOP_CONTINUOUSLY);
player.start();
} catch (InvalidMidiDataException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public MidiEvent makeEvent(int ev ,int intr , int whi , int vol ,int when){
MidiEvent event = null;
try{
ShortMessage s = new ShortMessage();
s.setMessage(ev, intr, whi, when);
event = new MidiEvent(s,when);
}catch(Exception e){
System.out.println("makeEvent failed");
}
return event;
}
void makeMidi(){
try {
player = MidiSystem.getSequencer();
player.open();
player.setTempoInBPM(120);
seq = new Sequence(Sequence.PPQ,4);
track = seq.createTrack();
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("makeMidi failed");
}
}
void startPlay(){
checkAndPlay();
}
class StartListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
startPlay();
// TODO Auto-generated method stub
}
}
class StopListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
player.stop();
// TODO Auto-generated method stub
}
}
class UpListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
player.setTempoFactor((float) (player.getTempoFactor()*1.03));
// TODO Auto-generated method stub
}
}
class DownListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
player.setTempoFactor((float) (player.getTempoFactor()*0.97));
}
}
}

这是书上的 ：
/**
* 2013.04.08
* Michel
*/
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; //把checkbox储存在ArrayList中
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
//乐器的名称，以String的array维护
String[] instrumentNames = {"Bass Drum","Closed Hi-Hat",
"Open Hi-Hat","Acoustic Snare","Crash Cymbal","Hand Clap",
"High Tom","Hi Bongo","Maracas","Whistle","Low Conga",
"Cowbell","Vibraslap","Low-mid Tom","High Agogo",
"Open Hi Conga"};
//实际的乐器关键字，例如35是bass，42是Closed Hi-Hat
int[] instruments = {35,42,46,38,49,39,50,60,70,72,64,56,58,47,67,63};
public static void main(String[] args) {
BeatBox gui = new BeatBox();
gui.buildGUI();
}
public void buildGUI(){
JFrame theFrame = new JFrame("Cyber BeatBox");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout layout = new BorderLayout();
JPanel background = new JPanel(layout);
//设定面板上摆设组件时的空白边缘
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//ArrayList<JCheckBox> checkboxList = new ArrayList<JCheckBox>(); //这种写法会报空指针错误。
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);
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);
//创建checkbox组，设定成未勾选。并加入到ArrayList和面板上
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);
}
//一般的MIDI设置程序代码
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();
}
}
//创建出16个元素的数组来存储一项乐器的值。
//如果该节应该要演奏，其值会是关键值，否则值为0
public void buildTrackAndStart(){
int[] trackList = null;
//清除掉旧的track做一个新的
sequence.deleteTrack(track);
track = sequence.createTrack();
//对每个乐器都执行一次
for(int i = 0; i<16; i++){
trackList = new int[16];
//设定代表乐器的关键字
int key = instruments[i];
//对每一拍执行一次
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;
}
}
//创建此乐器的事件并加到track上
makeTracks(trackList);
track.add(makeEvent(176,1,127,0,16));
}
//确保第16拍有时间，否则beatbox不会重复播放
track.add(makeEvent(192,9,1,0,15));
try{
sequencer.setSequence(sequence);
sequencer.setLoopCount(Sequencer.LOOP_CONTINUOUSLY); //指定无穷的重复次数
//开始播放
sequencer.start();
sequencer.setTempoInBPM(120);
}catch(Exception e){
e.printStackTrace();
}
}
//内部类 监听按钮
public class MyStartListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
buildTrackAndStart();
}
}
//内部类 监听按钮
public class MyStopListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
sequencer.stop();
}
}
//内部类 监听按钮
//节奏因子，预设为1.0，每次调整0.03
public class MyUpTempoListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float) (tempoFactor * 1.03));
}
}
//内部类 监听按钮
public class MyDownTempoListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
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;
}
}
先谢谢大家啦

这是书上的：
/**
* 2013.04.08
* Michel
*/
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; //把checkbox储存在ArrayList中
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
//乐器的名称，以String的array维护
String[] instrumentNames = {"Bass Drum","Closed Hi-Hat",
"Open Hi-Hat","Acoustic Snare","Crash Cymbal","Hand Clap",
"High Tom","Hi Bongo","Maracas","Whistle","Low Conga",
"Cowbell","Vibraslap","Low-mid Tom","High Agogo",
"Open Hi Conga"};
//实际的乐器关键字，例如35是bass，42是Closed Hi-Hat
int[] instruments = {35,42,46,38,49,39,50,60,70,72,64,56,58,47,67,63};
public static void main(String[] args) {
BeatBox gui = new BeatBox();
gui.buildGUI();
}
public void buildGUI(){
JFrame theFrame = new JFrame("Cyber BeatBox");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout layout = new BorderLayout();
JPanel background = new JPanel(layout);
//设定面板上摆设组件时的空白边缘
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//ArrayList<JCheckBox> checkboxList = new ArrayList<JCheckBox>(); //这种写法会报空指针错误。
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);
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);
//创建checkbox组，设定成未勾选。并加入到ArrayList和面板上
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);
}
//一般的MIDI设置程序代码
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();
}
}
//创建出16个元素的数组来存储一项乐器的值。
//如果该节应该要演奏，其值会是关键值，否则值为0
public void buildTrackAndStart(){
int[] trackList = null;
//清除掉旧的track做一个新的
sequence.deleteTrack(track);
track = sequence.createTrack();
//对每个乐器都执行一次
for(int i = 0; i<16; i++){
trackList = new int[16];
//设定代表乐器的关键字
int key = instruments[i];
//对每一拍执行一次
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;
}
}
//创建此乐器的事件并加到track上
makeTracks(trackList);
track.add(makeEvent(176,1,127,0,16));
}
//确保第16拍有时间，否则beatbox不会重复播放
track.add(makeEvent(192,9,1,0,15));
try{
sequencer.setSequence(sequence);
sequencer.setLoopCount(Sequencer.LOOP_CONTINUOUSLY); //指定无穷的重复次数
//开始播放
sequencer.start();
sequencer.setTempoInBPM(120);
}catch(Exception e){
e.printStackTrace();
}
}
//内部类 监听按钮
public class MyStartListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
buildTrackAndStart();
}
}
//内部类 监听按钮
public class MyStopListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
sequencer.stop();
}
}
//内部类 监听按钮
//节奏因子，预设为1.0，每次调整0.03
public class MyUpTempoListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
float tempoFactor = sequencer.getTempoFactor();
sequencer.setTempoFactor((float) (tempoFactor * 1.03));
}
}
//内部类 监听按钮
public class MyDownTempoListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent a) {
// TODO Auto-generated method stub
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;
}
}
谢谢大家啦