javax.sound.midi APIs, a null reference parameter to methods is incorrect unless explicitly documented on the method as having a meaningful interpretation. Usage to the contrary is incorrect coding and may result in a run time exception either immediately or at some later time. NullPointerException is an example of typical and acceptable run time exception for such cases.| Class | Description |
|---|---|
| ControllerEventListener | The ControllerEventListener interface should be implemented by classes whose instances need to be notified when a Sequencer has processed a requested type of MIDI control-change event. |
| Instrument | An instrument is a sound-synthesis algorithm with certain parameter settings, usually designed to emulate a specific real-world musical instrument or to achieve a specific sort of sound effect. |
| InvalidMidiDataException | An InvalidMidiDataException indicates that inappropriate MIDI data was encountered. |
| MetaEventListener | The MetaEventListener interface should be implemented by classes whose instances need to be notified when a Sequencer has processed a MetaMessage. |
| MetaMessage | A MetaMessage is a MidiMessage that is not meaningful to synthesizers, but that can be stored in a MIDI file and interpreted by a sequencer program. |
| MidiChannel | A MidiChannel object represents a single MIDI channel. |
| MidiDevice | MidiDevice is the base interface for all MIDI devices. |
| MidiDevice.Info | A MidiDevice.Info object contains assorted data about a MidiDevice, including its name, the company who created it, and descriptive text. |
| MidiDeviceReceiver | MidiDeviceReceiver is a Receiver which represents a MIDI input connector of a MidiDevice (see MidiDevice.getReceiver()). |
| MidiDeviceTransmitter | MidiDeviceTransmitter is a Transmitter which represents a MIDI input connector of a MidiDevice (see MidiDevice.getTransmitter()). |
| MidiEvent | MIDI events contain a MIDI message and a corresponding time-stamp expressed in ticks, and can represent the MIDI event information stored in a MIDI file or a Sequence object. |
| MidiFileFormat | A MidiFileFormat object encapsulates a MIDI file's type, as well as its length and timing information. |
| MidiMessage | MidiMessage is the base class for MIDI messages. |
| MidiSystem | The MidiSystem class provides access to the installed MIDI system resources, including devices such as synthesizers, sequencers, and MIDI input and output ports. |
| MidiUnavailableException | A MidiUnavailableException is thrown when a requested MIDI component cannot be opened or created because it is unavailable. |
| Patch | A Patch object represents a location, on a MIDI synthesizer, into which a single instrument is stored (loaded). |
| Receiver | A Receiver receives MidiEvent objects and typically does something useful in response, such as interpreting them to generate sound or raw MIDI output. |
| Sequence | A Sequence is a data structure containing musical information (often an entire song or composition) that can be played back by a Sequencer object. |
| Sequencer | A hardware or software device that plays back a MIDI sequence is known as a sequencer. |
| Sequencer.SyncMode | A SyncMode object represents one of the ways in which a MIDI sequencer's notion of time can be synchronized with a master or slave device. |
| ShortMessage | A ShortMessage contains a MIDI message that has at most two data bytes following its status byte. |
| Soundbank | A Soundbank contains a set of Instruments that can be loaded into a Synthesizer. |
| SoundbankResource | A SoundbankResource represents any audio resource stored in a Soundbank. |
| Synthesizer | A Synthesizer generates sound. |
| SysexMessage | A SysexMessage object represents a MIDI system exclusive message. |
| Track | A MIDI track is an independent stream of MIDI events (time-stamped MIDI data) that can be stored along with other tracks in a standard MIDI file. |
| Transmitter | |
| VoiceStatus | A VoiceStatus object contains information about the current status of one of the voices produced by a Synthesizer. |
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/sound/midi/package-summary.html