Java javax.sound.midi Class Sequence（JDK8）

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Standard Ed. 8

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java.lang.Object
- javax.sound.midi.Sequence

```
public class Sequence
extends Object
```
A Sequence is a data structure containing musical information (often an entire song or composition) that can be played back by a Sequencer object. Specifically, the Sequence contains timing information and one or more tracks. Each track consists of a series of MIDI events (such as note-ons, note-offs, program changes, and meta-events). The sequence's timing information specifies the type of unit that is used to time-stamp the events in the sequence.
A Sequence can be created from a MIDI file by reading the file into an input stream and invoking one of the getSequence methods of MidiSystem. A sequence can also be built from scratch by adding new Tracks to an empty Sequence, and adding MidiEvent objects to these Tracks.

See Also:

Sequencer.setSequence(java.io.InputStream stream), Sequencer.setSequence(Sequence sequence), Track.add(MidiEvent), MidiFileFormat

Field Summary

Fields
Modifier and Type	Field and Description
`protected float`	`divisionType` The timing division type of the sequence.
`static float`	`PPQ` The tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.
`protected int`	`resolution` The timing resolution of the sequence.
`static float`	`SMPTE_24` The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).
`static float`	`SMPTE_25` The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).
`static float`	`SMPTE_30` The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).
`static float`	`SMPTE_30DROP` The SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).
`protected Vector<Track>`	`tracks` The MIDI tracks in this sequence.

Constructor Summary

Constructors
Constructor and Description
`Sequence(float divisionType, int resolution)` Constructs a new MIDI sequence with the specified timing division type and timing resolution.
`Sequence(float divisionType, int resolution, int numTracks)` Constructs a new MIDI sequence with the specified timing division type, timing resolution, and number of tracks.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Track`	`createTrack()` Creates a new, initially empty track as part of this sequence.
`boolean`	`deleteTrack(Track track)` Removes the specified track from the sequence.
`float`	`getDivisionType()` Obtains the timing division type for this sequence.
`long`	`getMicrosecondLength()` Obtains the duration of this sequence, expressed in microseconds.
`Patch[]`	`getPatchList()` Obtains a list of patches referenced in this sequence.
`int`	`getResolution()` Obtains the timing resolution for this sequence.
`long`	`getTickLength()` Obtains the duration of this sequence, expressed in MIDI ticks.
`Track[]`	`getTracks()` Obtains an array containing all the tracks in this sequence.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PPQ
```
public static final float PPQ
```
    The tempo-based timing type, for which the resolution is expressed in pulses (ticks) per quarter note.
    
    See Also:
    
    Sequence(float, int), Constant Field Values
  - SMPTE_24
```
public static final float SMPTE_24
```
    The SMPTE-based timing type with 24 frames per second (resolution is expressed in ticks per frame).
    
    See Also:
    
    Sequence(float, int), Constant Field Values
  - SMPTE_25
```
public static final float SMPTE_25
```
    The SMPTE-based timing type with 25 frames per second (resolution is expressed in ticks per frame).
    
    See Also:
    
    Sequence(float, int), Constant Field Values
  - SMPTE_30DROP
```
public static final float SMPTE_30DROP
```
    The SMPTE-based timing type with 29.97 frames per second (resolution is expressed in ticks per frame).
    
    See Also:
    
    Sequence(float, int), Constant Field Values
  - SMPTE_30
```
public static final float SMPTE_30
```
    The SMPTE-based timing type with 30 frames per second (resolution is expressed in ticks per frame).
    
    See Also:
    
    Sequence(float, int), Constant Field Values
  - divisionType
```
protected float divisionType
```
    The timing division type of the sequence.
    
    See Also:
    
    PPQ, SMPTE_24, SMPTE_25, SMPTE_30DROP, SMPTE_30, getDivisionType()
  - resolution
```
protected int resolution
```
    The timing resolution of the sequence.
    
    See Also:
    
    getResolution()
  - tracks
```
protected Vector<Track> tracks
```
    The MIDI tracks in this sequence.
    
    See Also:
    
    getTracks()
- Constructor Detail
  - Sequence
```
public Sequence(float divisionType,
                int resolution)
         throws InvalidMidiDataException
```
    Constructs a new MIDI sequence with the specified timing division type and timing resolution. The division type must be one of the recognized MIDI timing types. For tempo-based timing, divisionType is PPQ (pulses per quarter note) and the resolution is specified in ticks per beat. For SMTPE timing, divisionType specifies the number of frames per second and the resolution is specified in ticks per frame. The sequence will contain no initial tracks. Tracks may be added to or removed from the sequence using createTrack() and deleteTrack(javax.sound.midi.Track).
    
    Parameters:
    
    divisionType - the timing division type (PPQ or one of the SMPTE types)
    
    resolution - the timing resolution
    
    Throws:
    
    InvalidMidiDataException - if divisionType is not valid
    
    See Also:
    
    PPQ, SMPTE_24, SMPTE_25, SMPTE_30DROP, SMPTE_30, getDivisionType(), getResolution(), getTracks()
  - Sequence
```
public Sequence(float divisionType,
                int resolution,
                int numTracks)
         throws InvalidMidiDataException
```
    Constructs a new MIDI sequence with the specified timing division type, timing resolution, and number of tracks. The division type must be one of the recognized MIDI timing types. For tempo-based timing, divisionType is PPQ (pulses per quarter note) and the resolution is specified in ticks per beat. For SMTPE timing, divisionType specifies the number of frames per second and the resolution is specified in ticks per frame. The sequence will be initialized with the number of tracks specified by numTracks. These tracks are initially empty (i.e. they contain only the meta-event End of Track). The tracks may be retrieved for editing using the getTracks() method. Additional tracks may be added, or existing tracks removed, using createTrack() and deleteTrack(javax.sound.midi.Track).
    
    Parameters:
    
    divisionType - the timing division type (PPQ or one of the SMPTE types)
    
    resolution - the timing resolution
    
    numTracks - the initial number of tracks in the sequence.
    
    Throws:
    
    InvalidMidiDataException - if divisionType is not valid
    
    See Also:
    
    PPQ, SMPTE_24, SMPTE_25, SMPTE_30DROP, SMPTE_30, getDivisionType(), getResolution()
- Method Detail
  - getDivisionType
```
public float getDivisionType()
```
    Obtains the timing division type for this sequence.
    
    Returns:
    
    the division type (PPQ or one of the SMPTE types)
    
    See Also:
    
    PPQ, SMPTE_24, SMPTE_25, SMPTE_30DROP, SMPTE_30, Sequence(float, int), MidiFileFormat.getDivisionType()
  - getResolution
```
public int getResolution()
```
    Obtains the timing resolution for this sequence. If the sequence's division type is PPQ, the resolution is specified in ticks per beat. For SMTPE timing, the resolution is specified in ticks per frame.
    
    Returns:
    
    the number of ticks per beat (PPQ) or per frame (SMPTE)
    
    See Also:
    
    getDivisionType(), Sequence(float, int), MidiFileFormat.getResolution()
  - createTrack
```
public Track createTrack()
```
    Creates a new, initially empty track as part of this sequence. The track initially contains the meta-event End of Track. The newly created track is returned. All tracks in the sequence may be retrieved using getTracks(). Tracks may be removed from the sequence using deleteTrack(javax.sound.midi.Track).
    
    Returns:
    
    the newly created track
  - deleteTrack
```
public boolean deleteTrack(Track track)
```
    Removes the specified track from the sequence.
    
    Parameters:
    
    track - the track to remove
    
    Returns:
    
    true if the track existed in the track and was removed, otherwise false.
    
    See Also:
    
    createTrack(), getTracks()
  - getTracks
```
public Track[] getTracks()
```
    Obtains an array containing all the tracks in this sequence. If the sequence contains no tracks, an array of length 0 is returned.
    
    Returns:
    
    the array of tracks
    
    See Also:
    
    createTrack(), deleteTrack(javax.sound.midi.Track)
  - getMicrosecondLength
```
public long getMicrosecondLength()
```
    Obtains the duration of this sequence, expressed in microseconds.
    
    Returns:
    
    this sequence's duration in microseconds.
  - getTickLength
```
public long getTickLength()
```
    Obtains the duration of this sequence, expressed in MIDI ticks.
    
    Returns:
    
    this sequence's length in ticks
    
    See Also:
    
    getMicrosecondLength()
  - getPatchList
```
public Patch[] getPatchList()
```
    Obtains a list of patches referenced in this sequence. This patch list may be used to load the required Instrument objects into a Synthesizer.
    
    Returns:
    
    an array of Patch objects used in this sequence
    
    See Also:
    
    Synthesizer.loadInstruments(Soundbank, Patch[])

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Java™ Platform
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Java javax.sound.midi Class Sequence（JDK8）

Class Sequence

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PPQ

SMPTE_24

SMPTE_25

SMPTE_30DROP

SMPTE_30

divisionType

resolution

tracks

Constructor Detail

Sequence

Sequence

Method Detail

getDivisionType

getResolution

createTrack

deleteTrack

getTracks

getMicrosecondLength

getTickLength

getPatchList