[appA] Bringing in some of the changes from the final Chapter 16 code

import javax.sound.midi.*;

import javax.swing.*;

import javax.swing.event.ListSelectionEvent;

import javax.swing.event.ListSelectionListener;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.net.Socket;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Vector;

import java.util.*;

import static javax.sound.midi.ShortMessage.CONTROL_CHANGE;

import static javax.sound.midi.ShortMessage.PROGRAM_CHANGE;

public class BeatBoxFinal {

  private JFrame theFrame;

  private Sequence sequence;

  private Track track;

  private final 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"};

  private final int[] instruments = {35, 42, 46, 38, 49, 39, 50, 60, 70, 72, 64, 56, 58, 47, 67, 63};

  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"};

  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 BeatBoxFinal().startUp(args[0]);  // args[0] is your user ID/screen name

    checkboxList = new ArrayList<>();

    Box buttonBox = new Box(BoxLayout.Y_AXIS);

    JButton start = new JButton("Start");

    start.addActionListener(new MyStartListener());

    start.addActionListener(e -> buildTrackAndStart());

    buttonBox.add(start);

    JButton stop = new JButton("Stop");

    stop.addActionListener(new MyStopListener());

    stop.addActionListener(e -> sequencer.stop());

    buttonBox.add(stop);

    JButton upTempo = new JButton("Tempo Up");

    upTempo.addActionListener(new MyUpTempoListener());

    upTempo.addActionListener(e -> changeTempo(1.03f));

    buttonBox.add(upTempo);

    JButton downTempo = new JButton("Tempo Down");

    downTempo.addActionListener(new MyDownTempoListener());

    downTempo.addActionListener(e -> changeTempo(0.97f));

    buttonBox.add(downTempo);

    JButton sendIt = new JButton("sendIt");

    theFrame.setVisible(true);

  }

  public void setUpMidi() {

  private void setUpMidi() {

    try {

      sequencer = MidiSystem.getSequencer();

      sequencer.open();

    ArrayList<Integer> trackList; // this will hold the instruments for each

    sequence.deleteTrack(track);

    track = sequence.createTrack();

    for (int i = 0; i < 16; i++) {

      trackList = new ArrayList<>();

      int key = instruments[i];

      for (int j = 0; j < 16; j++) {

        JCheckBox jc = checkboxList.get(j + (16 * i));

        if (jc.isSelected()) {

          int key = instruments[i];

          trackList.add(key);

        } else {

          trackList.add(null);  // because this slot should be empty in the track

        }

      }

      makeTracks(trackList);

      track.add(makeEvent(CONTROL_CHANGE, 1, 127, 0, 16));

    }

    track.add(makeEvent(192, 9, 1, 0, 15)); // - so we always go to full 16 beats

    track.add(makeEvent(PROGRAM_CHANGE, 9, 1, 0, 15)); // - so we always go to full 16 beats

    try {

      sequencer.setSequence(sequence);

      sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);

      sequencer.start();

      sequencer.setTempoInBPM(120);

      sequencer.start();

    } 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) {

  private void changeTempo(float tempoMultiplier) {

    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));

    }

    sequencer.setTempoFactor(tempoFactor * tempoMultiplier);

  }

  public class MySendListener implements ActionListener {

    public void actionPerformed(ActionEvent a) {

      // make an arraylist of just the STATE of the checkboxes

      // make an array of just the STATE of the checkboxes

      boolean[] checkboxState = new boolean[256];

      for (int i = 0; i < 256; i++) {

        JCheckBox check = (JCheckBox) checkboxList.get(i);

        JCheckBox check = checkboxList.get(i);

        if (check.isSelected()) {

          checkboxState[i] = true;

        }

      }

      String messageToSend = null;

      try {

        out.writeObject(userName + nextNum++ + ": " + userMessage.getText());

        out.writeObject(checkboxState);

      } catch (Exception ex) {

        System.out.println("Sorry dude. Could not send it to the server.");

      } catch (IOException e) {

        System.out.println("Terribly sorry. Could not send it to the server.");

        e.printStackTrace();

      }

      userMessage.setText("");

    }