Head First 中BeatBox code，（内部类的使用）

这里内部类嵌套在外部类上BeatMusic，内部类使用外部类的实例和方法就像开自家冰箱一样，这里的内部类就是实现不同功能的按钮监听器，按钮就会有不同的功能，

也就是用不同的内部类实现相同的接口。这里都是ActionListened

package com.example.zxlib;import java.awt.*;import javax.swing.*;
import javax.sound.midi.*;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.*;
import java.awt.event.*;public class BeatMusic {JPanel mainPanel;JPanel mainPanel2;int keychan = 9;ArrayList<JCheckBox> checkaboxList;ArrayList<JCheckBox> checkchansList;Sequence sequence;Sequencer sequencer;Track track;JFrame theFrame;String[] instrumentNames = {"Baa Drum", "Closed Hi-Hat","Open Hi-Hat", "Acoustic Snare", "Crash Cymbal","Hand Clap", "High Tom", "Hi Bongo", "Maracas","Whistlte", "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};int[] chans = {1, 2, 3, 4, 5, 6, 7, 8, 9};public static void main(String[] args) {new BeatMusic().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, 101, 10));checkaboxList = new ArrayList<JCheckBox>();checkchansList = 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 clear = new JButton("Clear");clear.addActionListener(new MyClearListener());buttonBox.add(clear);JButton restore = new JButton("Restore");restore.addActionListener(new MyRestoreListener());buttonBox.add(restore);//        JButton serialize= new JButton("Serizalizelt");
//        serialize.addActionListener(new MySerizalizeListener());
//        buttonBox.add(serialize);JButton read=new JButton("Read");read.addActionListener(new MyReadListener());buttonBox.add(read);JButton upTempo = new JButton("tempUP");upTempo.addActionListener(new MyUpTempoListener());buttonBox.add(upTempo);JButton downTempo = new JButton("tempDown");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]));}Box chanBox = new Box(BoxLayout.X_AXIS);background.add(BorderLayout.EAST, buttonBox);background.add(BorderLayout.WEST, nameBox);theFrame.getContentPane().add(background);GridLayout grid = new GridLayout(16, 16);grid.setVgap(1);grid.setVgap(2);mainPanel = new JPanel(grid);GridLayout grid2 = new GridLayout(1, 10);grid2.setVgap(1);grid2.setVgap(2);mainPanel2 = new JPanel(grid2);background.add(BorderLayout.CENTER, mainPanel);background.add(BorderLayout.SOUTH, mainPanel2);
//        background.add(BorderLayout.SOUTH, chanBox);for (int i = 0; i < 10; i++) {chanBox.add(new Label(i + ""));JCheckBox cc = new JCheckBox();cc.setSelected(false);checkchansList.add(cc);mainPanel2.add(cc);};for (int i = 0; i < 256; i++) {JCheckBox c = new JCheckBox();c.setSelected(false);checkaboxList.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 (MidiUnavailableException e) {e.printStackTrace();} catch (InvalidMidiDataException e) {e.printStackTrace();}}public void buildClear() {for (int i = 0; i < 256; i++) {JCheckBox jjc = (JCheckBox) checkaboxList.get(i);jjc.setSelected(false);}}public int changeChans() {// int[] chanList = null;int chan = 9;for (int i = 0; i < 10; i++) {JCheckBox jcc = (JCheckBox) checkchansList.get(i);if (jcc.isSelected()) {//      chanList[i] = i;chan = i+8;break;}}return chan;}public final void buildTrackAndStart() {keychan = changeChans();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) checkaboxList.get(j + (16 * i));if (jc.isSelected()) {trackList[j] = key;} else {trackList[j] = 0;}}System.out.println("keychan is:"+keychan);
//怎么改变chan来改变不同乐器演奏？makeTracks(trackList);track.add(makeEvent(176, keychan, 127, 0, 16));}track.add(makeEvent(192, keychan, 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 MyClearListener implements ActionListener {public void actionPerformed(ActionEvent a) {buildClear();}}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 * 0.97));}}public  class   MyRestoreListener implements ActionListener{public void actionPerformed (ActionEvent a){boolean[] checkboxStats = new boolean[256];for (int i=0;i<256;i++){JCheckBox check=(JCheckBox) checkaboxList.get(i);if(check.isSelected()){checkboxStats[i]=true;}}try{FileOutputStream fileStream = new FileOutputStream(new File("Checkbox.ser"));ObjectOutputStream os= new ObjectOutputStream(fileStream);os.writeObject(checkboxStats);}catch (Exception e){e.printStackTrace();}}}public class MyReadListener implements ActionListener {@Overridepublic void actionPerformed(ActionEvent actionEvent) {boolean[] checkboxStats = null;try {FileInputStream fileIn = new FileInputStream(new File("Checkbox.ser"));ObjectInputStream is = new ObjectInputStream(fileIn);checkboxStats = (boolean[]) is.readObject();} catch (Exception e) {e.printStackTrace();}for (int i=0; i < 256; i++) {JCheckBox check = (JCheckBox) checkaboxList.get(i);if (checkboxStats[i]) {check.setSelected(true);} else {check.setSelected(false);}}sequencer.stop();buildTrackAndStart();//}}public void makeTracks(int[] list) {for (int i = 0; i < 16; i++) {int key = list[i];if (key != 0) {track.add(makeEvent(144, keychan, key, 100, i));track.add(makeEvent(128, keychan, 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;}}

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Head First 中BeatBox code，（内部类的使用）

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