[Ch13] Book version of MiniMusicCmdLine

package ch13;

import javax.sound.midi.*;

public class MiniMusicCmdLine {       

   public static void main(String[] args) {

        MiniMusicCmdLine mini = new MiniMusicCmdLine();

        if (args.length < 2) {

            System.out.println("Don’t forget the instrument and note args");

        } else {

            int instrument = Integer.parseInt(args[0]);

            int note = Integer.parseInt(args[1]);

            mini.play(instrument, note);

        }

   } // close main

   public void play(int instrument, int note) {

      try {

         Sequencer player = MidiSystem.getSequencer();         

         player.open();     

         Sequence seq = new Sequence(Sequence.PPQ, 4);         

         Track track = seq.createTrack();  

         MidiEvent event = null;

         ShortMessage first = new ShortMessage();

         first.setMessage(192, 1, instrument, 0);

         MidiEvent changeInstrument = new MidiEvent(first, 1); 

         track.add(changeInstrument);

         ShortMessage a = new ShortMessage();

         a.setMessage(144, 1, note, 100);

         MidiEvent noteOn = new MidiEvent(a, 1); 

         track.add(noteOn);

         ShortMessage b = new ShortMessage();

         b.setMessage(128, 1, note, 100);

         MidiEvent noteOff = new MidiEvent(b, 16); 

         track.add(noteOff);

         player.setSequence(seq); 

         player.start();

      } catch (Exception ex) {ex.printStackTrace();}

   } // close play

} // close class

 No newline at end of file

package ch13;

public class Snippets {

  void testTryCatch() {

    try {

      Risky x = new Risky();

      Foo f = x.doRiskyThing();

      int b = f.getNum();

    } catch (Exception e) {

      System.out.println("failed");

    }

    System.out.println("We made it!");

  }

}

class Risky {

  public Foo doRiskyThing() {

    return null;

  }

}

class Foo {

  public int getNum() {

    return 0;

  }

}