&引用;背景“;使用Java制作BeatBox的设置帮助
我试图使用Java制作BeatBox,但我的代码没有运行,下面一行显示了问题:&引用;背景“;使用Java制作BeatBox的设置帮助,java,swing,background,beatbox,Java,Swing,Background,Beatbox,我试图使用Java制作BeatBox,但我的代码没有运行,下面一行显示了问题: background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10)); 请帮助我找到解决问题的方法 import java.awt.*; import javax.swing.*; import javax.sound.midi.*; import java.util.*; import java.awt.event.*; public class
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
请帮助我找到解决问题的方法
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;
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
String[] instrumentNames={ "Bass Drum","Closed Hi-Hat","Open Hi Hat","Acoustic Snare","Crash Cymbol","Hand Clap","High Tom","Hi Bongo","Maracas","Whistle","Low Conga","Cowbell","Vivraslap","Low-mid Tom","High Agogo", "Open Hi Conga"};
int[] instruments={35,42,46,38,49,50,60,70,72,64,56,58,47,67,63};
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();
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//problem
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");
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);//problem
background.add(BorderLayout.WEST,nameBox);//problem
theFrame.getContentPane().add(background);//problem
GridLayout grid=new GridLayout(16,16);
grid.setVgap(1);
grid.setHgap(2);
mainPanel.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();}
}
public class MyStartListener implements ActionListener{
public void actionPerformed(ActionEvent a){
buildTrackAndStart();
}
}
public class MyStopListener implements ActionListener{
public void actionPerformed(ActionEvent a){
sequencer.stop();
}
}
public class MyUpTempoListener implements ActionListener{
public void actionPerformed(ActionEvent a){
float tempoFactor=sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*1.03));
}
}
public class MyDownTempoListener implements ActionListener{
public void actionPerformed(ActionEvent a){
float tempoFactor=sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*.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;
}
}
import java.awt.*;
导入javax.swing.*;
导入javax.sound.midi.*;
导入java.util.*;
导入java.awt.event.*;
公共类BeatBox{
JPanel主面板;
ArrayList复选框列表;
测序器;
序列;
轨道;
JFrame框架;
弦乐[]乐器名称={“低音鼓”、“收拢的高帽子”、“打开的高帽子”、“原声圈套”、“碰撞钹”、“手拍”、“高汤姆”、“高邦戈”、“马拉卡斯”、“口哨”、“低康加”、“考贝尔”、“Vivraslap”、“低中汤姆”、“高阿戈”、“打开的高康加”};
国际[]文书={35,42,46,38,49,50,60,70,72,64,56,58,47,67,63};
公共静态void main(字符串[]args){
新建BeatBox().buildGUI();
}
public void buildGUI(){
theFrame=新JFrame(“赛博BeatBox”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout=新的BorderLayout();
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//问题
checkboxList=newarraylist();
框按钮框=新框(框布局Y_轴);
JButton start=新JButton(“start”);
start.addActionListener(新的MyStartListener());;
按钮盒。添加(开始);
JButton stop=新JButton(“stop”);
addActionListener(新的MyStopListener());;
按钮盒。添加(停止);
JButton upTempo=新JButton(“节拍上升”);
start.addActionListener(新的MyUpTempoListener());;
按钮盒。添加(upTempo);
JButton downTempo=新JButton(“Tempo Down”);
start.addActionListener(新的MyDownTempoListener());
按钮盒。添加(下拍子);
盒子名称盒子=新盒子(盒子布局Y_轴);
对于(inti=0;i我不知道从何处获得这段代码。如果您是自己编写的,那么我的建议是现在就开始阅读Java和Swing的基础知识。
这段代码有很多问题,我已经修改了一些,现在它没有编译错误。
但是请不要遵循这种代码
修改后的代码没有编译错误:
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.sound.midi.MidiEvent;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.Sequence;
import javax.sound.midi.Sequencer;
import javax.sound.midi.ShortMessage;
import javax.sound.midi.Track;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class BeatBox {
JPanel mainPanel;
ArrayList<JCheckBox> checkboxList;
Sequencer sequencer;
Sequence sequence;
Track track;
JFrame theFrame;
String[] instrumentNames={ "Bass Drum","Closed Hi-Hat","Open Hi Hat","Acoustic Snare","Crash Cymbol","Hand Clap","High Tom","Hi Bongo","Maracas","Whistle","Low Conga","Cowbell","Vivraslap","Low-mid Tom","High Agogo", "Open Hi Conga"};
int[] instruments={35,42,46,38,49,50,60,70,72,64,56,58,47,67,63};
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();
theFrame.setContentPane(background);
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//problem
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");
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);//problem
background.add(BorderLayout.WEST,nameBox);//problem
//theFrame.getContentPane().add(background);//problem
GridLayout grid=new GridLayout(16,16);
grid.setVgap(1);
grid.setHgap(2);
mainPanel=new JPanel();
// mainPanel.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();}
}
public class MyStartListener implements ActionListener{
public void actionPerformed(ActionEvent a){
buildTrackAndStart();
}
}
public class MyStopListener implements ActionListener{
public void actionPerformed(ActionEvent a){
sequencer.stop();
}
}
public class MyUpTempoListener implements ActionListener{
public void actionPerformed(ActionEvent a){
float tempoFactor=sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*1.03));
}
}
public class MyDownTempoListener implements ActionListener{
public void actionPerformed(ActionEvent a){
float tempoFactor=sequencer.getTempoFactor();
sequencer.setTempoFactor((float)(tempoFactor*.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;
}
}
导入java.awt.BorderLayout;
导入java.awt.GridLayout;
导入java.awt.Label;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.util.ArrayList;
导入javax.sound.midi.MidiEvent;
导入javax.sound.midi.midi系统;
导入javax.sound.midi.Sequence;
导入javax.sound.midi.Sequencer;
导入javax.sound.midi.ShortMessage;
导入javax.sound.midi.Track;
导入javax.swing.BorderFactory;
导入javax.swing.Box;
导入javax.swing.BoxLayout;
导入javax.swing.JButton;
导入javax.swing.JCheckBox;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
公共类BeatBox{
JPanel主面板;
ArrayList复选框列表;
测序器;
序列;
轨道;
JFrame框架;
弦乐[]乐器名称={“低音鼓”、“收拢的高帽子”、“打开的高帽子”、“原声圈套”、“碰撞钹”、“手拍”、“高汤姆”、“高邦戈”、“马拉卡斯”、“口哨”、“低康加”、“考贝尔”、“Vivraslap”、“低中汤姆”、“高阿戈”、“打开的高康加”};
国际[]文书={35,42,46,38,49,50,60,70,72,64,56,58,47,67,63};
公共静态void main(字符串[]args){
新建BeatBox().buildGUI();
}
public void buildGUI(){
theFrame=新JFrame(“赛博BeatBox”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout=新的BorderLayout();
JPanel background=新的JPanel();
setContentPane(背景);
background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));//问题
checkboxList=newarraylist();
框按钮框=新框(框布局Y_轴);
JButton start=新JButton(“start”);
start.addActionListener(新的MyStartListener());;
按钮盒。添加(开始);
JButton stop=新JButton(“stop”);
addActionListener(新的MyStopListener());;
按钮盒。添加(停止);
JButton upTempo=新JButton(“节拍上升”);
start.addActionListener(新的MyUpTempoListener());;
按钮盒。添加(upTempo);
JButton downTempo=新JButton(“Tempo Down”);
start.addActionListener(新的MyDownTempoListener());
按钮盒。添加(下拍子);
盒子名称盒子=新盒子(盒子布局Y_轴);
例如,对于(int i=0;我创建一个简单的框架应用程序,然后在BorderLayout.EAST和BorderLayout.WEST中放置几个jlabel或jbutton。解决并理解这些问题,您将在BeatBox代码中发现一些问题。谢谢您的回答。我对Java是新手,我正在从一本名为“头先Java”的书中学习它1.你能给我一些如何提高这门语言的建议吗?