Ошибка компиляции Java

Question

[Vlad_Ilnitskiy]

Есть программный код, пример из книги. В нем один большой класс, в котором есть внутренние. При компиляции ругается на одно и то же: "is not abstract and does not override abstract method".
Вот собственно код:

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 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 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 actionPerfomed(ActionEvent a) {
		  buildTrackAndStart();
	  }
}
private class MyStopListener implements ActionListener {
	 public void actionPerfomed (ActionEvent a) {
		 sequencer.stop();
	 }
 }
public class MyUpTempoListener implements ActionListener {
	 public void actionPerfomed(ActionEvent a) {
		  float tempoFactor = sequencer.getTempoFactor();
		    sequencer.setTempoFactor((float) (tempoFactor * 1.03));
		}
 }
public class MyDownTempoListener implements ActionListener {
	 public void actionPerfomed(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;
	 }
 }

При гуглении оказалось, что в ранних версиях ява на это не ругалась, но толкового решения так и не нашел.

Answer 1

[verwolfdotss]

У вас в методе actionPerformed опечатка.

Comments

[Vlad_Ilnitskiy]

Спасибо огромное, я ужасно невнимателен :)