[appA] Fixing the chat UI: making the input a text area not a field; adding...

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

public class BeatBoxFinal {

  private JFrame theFrame;

  private JPanel mainPanel;

  private JList<String> incomingList;

  private JTextField userMessage;

  private JTextArea userMessage;

  private ArrayList<JCheckBox> checkboxList;

  private int nextNum;

  private Vector<String> listVector = new Vector<>();

  }

  public void buildGUI() {

    theFrame = new JFrame("Cyber BeatBox");

    JFrame frame = new JFrame("Cyber BeatBox");

    frame.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<>();

    Box buttonBox = new Box(BoxLayout.Y_AXIS);

    JButton start = new JButton("Start");

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

    buttonBox.add(start);

    sendIt.addActionListener(new MySendListener());

    buttonBox.add(sendIt);

    userMessage = new JTextField();

    userMessage = new JTextArea();

    userMessage.setLineWrap(true);

    userMessage.setWrapStyleWord(true);

    JScrollPane messageScroller = new JScrollPane(userMessage);

    buttonBox.add(userMessage);

    buttonBox.add(messageScroller);

    incomingList = new JList<>();

    incomingList.addListSelectionListener(new MyListSelectionListener());

    incomingList.setListData(listVector); // no data to start with

    Box nameBox = new Box(BoxLayout.Y_AXIS);

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

      nameBox.add(new Label(instrumentNames[i]));

    for (String instrumentName : instrumentNames) {

      JLabel instrumentLabel = new JLabel(instrumentName);

      instrumentLabel.setBorder(BorderFactory.createEmptyBorder(4, 1, 4, 1));

      nameBox.add(instrumentLabel);

    }

    background.add(BorderLayout.EAST, buttonBox);

    background.add(BorderLayout.WEST, nameBox);

    theFrame.getContentPane().add(background);

    frame.getContentPane().add(background);

    GridLayout grid = new GridLayout(16, 16);

    grid.setVgap(1);

    grid.setHgap(2);

    mainPanel = new JPanel(grid);

    JPanel mainPanel = new JPanel(grid);

    background.add(BorderLayout.CENTER, mainPanel);

    checkboxList = new ArrayList<>();

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

      JCheckBox c = new JCheckBox();

      c.setSelected(false);

      mainPanel.add(c);

    }

    theFrame.setBounds(50, 50, 300, 300);

    theFrame.pack();

    theFrame.setVisible(true);

    frame.setBounds(50, 50, 300, 300);

    frame.pack();

    frame.setVisible(true);

  }

  private void setUpMidi() {