Swing/MidiSystem のバックアップの現在との差分(No.2)

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URL url = getClass().getResource("Mozart_toruko_k.mid");
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URL url = getClass().getResource("Mozart_toruko_k.mid");
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SwingWorker<Void, Long> worker = new SwingWorker<Void, Long>() {
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  private long tickPos;
  @Override protected Void doInBackground() throws InterruptedException {
    try (Sequencer sequencer = MidiSystem.getSequencer()) {
      sequencer.open();
      sequencer.setSequence(MidiSystem.getSequence(url));
      sequencer.addMetaEventListener(e -> {
        if (e.getType() == END_OF_TRACK) {
          publish(0L);
        }
      });
      EventQueue.invokeLater(() -> addListener(sequencer));
      while (sequencer.isOpen()) {
        updateTickPosition(sequencer);
      }
    } catch (InvalidMidiDataException | MidiUnavailableException | IOException ex) {
      ex.printStackTrace();
      publish(0L);
    } finally {
      System.out.println("try-with-resources: AutoCloseable");
    }
    return null;
  }
  // ...

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**サンプルコード [#s9901c5c]
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#code{{
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 final Sequencer sequencer;
 try{
   sequencer = MidiSystem.getSequencer();
   sequencer.open();
   InputStream is = new BufferedInputStream(
     MainPanel.class.getResourceAsStream("Mozart_toruko_k.mid"));
   Sequence s = MidiSystem.getSequence(is);
   sequencer.setSequence(s);
 }catch(Exception e) {
   e.printStackTrace();
   return;
 }
 start = new JButton(new AbstractAction("start") {
   public void actionPerformed(ActionEvent ae) {
     sequencer.start();
   }
 });
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JButton start = new JButton("start");
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start.addActionListener(e -> {
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  sequencer.setTickPosition(tickPos);
  sequencer.start();
  initButtons(false);
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});
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