javax.sound.midi

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1. Playing a MIDI file:

   import javax.sound.midi.*;
   
   public class MidiPlayer {
   
       public static void main(String[] args) {
           try {
               // Create a Sequencer
               Sequencer sequencer = MidiSystem.getSequencer();
               // Open the Sequencer
               sequencer.open();
               // Load a MIDI file into the Sequencer
               sequencer.setSequence(MidiSystem.getSequence(new File("mySong.mid")));
               // Start the Sequencer
               sequencer.start();
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }

2. Recording a MIDI performance:

   import javax.sound.midi.*;
   
   public class MidiRecorder {
   
       public static void main(String[] args) {
           try {
               // Create a Sequencer
               Sequencer sequencer = MidiSystem.getSequencer();
               // Open the Sequencer
               sequencer.open();
               // Create a new Sequence
               Sequence sequence = new Sequence(Sequence.PPQ, 24);
               // Create a new Track
               Track track = sequence.createTrack();
               // Record MIDI events to the Track
               sequencer.recordEnable(track, -1);
               // Start the Sequencer
               sequencer.start();
               // Stop the Sequencer after 10 seconds
               Thread.sleep(10000);
               // Stop recording MIDI events
               sequencer.recordDisable(track);
               // Save the Sequence to a MIDI file
               MidiSystem.write(sequence, 1, new File("myRecording.mid"));
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }

3. Creating a simple synthesizer:

   import javax.sound.midi.*;
   
   public class SimpleSynthesizer {
   
       public static void main(String[] args) {
           try {
               // Create a Synthesizer
               Synthesizer synthesizer = MidiSystem.getSynthesizer();
               // Open the Synthesizer
               synthesizer.open();
               // Load a sound bank into the Synthesizer
               synthesizer.loadInstrument(synthesizer.getDefaultSoundbank().getInstruments()[0]);
               // Create a new Channel
               Channel channel = synthesizer.getChannels()[0];
               // Play a note
               channel.noteOn(60, 100);
               // Hold the note for 1 second
               Thread.sleep(1000);
               // Release the note
               channel.noteOff(60);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }

4. Creating a custom MIDI controller:

   import javax.sound.midi.*;
   
   public class MidiController {
   
       public static void main(String[] args) {
           try {
               // Create a MIDI device
               MidiDevice device = MidiSystem.getMidiDevice(0);
               // Open the MIDI device
               device.open();
               // Create a MIDI transmitter
               Transmitter transmitter = device.getTransmitter();
               // Create a MIDI receiver