Ошибка при написании проги из Java Headfirst
Текст ошибки
java.io.FileNotFoundException: Checkbox.ser (Не удается найти указанный файл)
at java.base/java.io.FileInputStream.open0(Native Method)
at java.base/java.io.FileInputStream.open(FileInputStream.java:220)
at java.base/java.io.FileInputStream.<init>(FileInputStream.java:158)
at BeatBox$MyReadInListener.actionPerformed(BeatBox.java:192)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6589)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6354)
at java.desktop/java.awt.Container.processEvent(Container.java:2261)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4966)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4914)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4543)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4484)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2305)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at BeatBox$MyReadInListener.actionPerformed(BeatBox.java:198) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270) at java.desktop/java.awt.Component.processMouseEvent(Component.java:6589) at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342) at java.desktop/java.awt.Component.processEvent(Component.java:6354) at java.desktop/java.awt.Container.processEvent(Container.java:2261) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4966) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2319) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4914) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4543) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4484) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2305) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4798) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Process finished with exit code 0
import javax.sound.midi.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.*;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.ArrayList;
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 Share", "Crash Cymbal", "Hand Clap", "High Tom", "Hi 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");
stop.addActionListener (new MyStopListener());
buttonBox.add(stop);
JButton upTempo = new JButton ("Tempo Up");
start.addActionListener (new MyUpTempoListener());
buttonBox.add(upTempo);
JButton serializeit = new JButton("SerializeIt");
start.addActionListener(new MySendListener());
buttonBox.add(serializeit);
JButton restore = new JButton("restore");
start.addActionListener(new MyReadInListener());
buttonBox.add(restore);
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();
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();}
}
private class MyStartListener implements ActionListener {
public void actionPerformed(ActionEvent a) {
buildTrackAndStart();
}
}
private 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(144,9,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);
} catch (Exception ex){
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);
}
}
}
}
}