Note(String, double) :The main constructor in which the user provides the pitch
ID: 3881726 • Letter: N
Question
Note(String, double) :The main constructor in which the user provides the pitch name and
the duration.
Note(int, double) :An alternate constructor using a MIDI value for the pitch.
Note(String) :An alternate constructor using the (whole) string representation of a note.
int toMidi(String) : Convert a pitch name into its MIDI value. (e.g. c#6 ! 73) (static)
String toPitch(int) : Convert a MIDI value into its pitch name. (e.g. 41 ! f3) (static)
String getPitch() : Returns the name of this note's pitch.
int getMidiPitch() : Returns the MIDI value of this note's pitch.
double getDuration() : Returns the duration of this note.
Note stretch(double) : Return a new note with the same pitch but with the duration equal
to the product of this note's duration with the argument.
Note transpose(int) : Return a new note transposed higher (or lower, if the argument is neg-
ative) by the given interval (number of MIDI values).
String toString() : Returns a string of the form p x d" where p is the name of the pitch and
d is the duration.
boolean equals(Object) : Return true if the argument is a note with the same pitch and
duration.
int hashCode() : Returns an int associated with this Note. You should compute a unique
integer eciently (without computing string hashcodes).
public class Note {
/* Static Constants */
public static final int DEFAULT_INTENSITY = 50;
public static final int REST_PITCH = 128; // First illegal pitch, used for rests.
private static final int PITCHES_PER_OCTAVE = 12;
private static final String[] NOTE_LETTERS = {"c","c#","d","d#","e","f","f#","g","g#","a","a#","b"};
private static final double MIN_DURATION = 1.0/64, // One sixty-fourth
MAX_DURATION = 8.0; // Eight whole notes
/** Fields (Immutable) */
private final String pitch;
private final int midiValue;
private final double duration;
/**
* Instantiates a new note based on a string denoting note letter and octave.
*
* @param pitch the pitch (e.g. "f6")
* @param duration the duration
* @throws NullPointerException if pitch is null
* @throws IllegalArgumentException if:
* 1. The pitch parameter is malformed or out of range.
* 2. The duration parameter is out of range.
*/
public Note(String pitch, double duration) {
// TODO
// Recommended: First implement toMidi(String).
}
/**
* Instantiates a new note based on MIDI value.
*
* @param midiValue the MIDI value (e.g. 68)
* @param duration the duration
* @throws IllegalArgumentException if:
* 1. The MIDI pitch parameter is out of range.
* 2. The duration parameter is out of range.
*/
public Note(int midiValue, double duration) {
// TODO
// Recommended: First implement toPitch(int).
}
/**
* Instantiates a new note from a String matching the format of Note's toString() method.
*
* @param note the string representation
*
* @throws IndexOutOfBoundsException if parameter isn't in correct format
* @throws NumberFormatException if duration representation cannot be parsed as double
* @throws IllegalArgumentException if the elements in the format are not permitted.
*/
public Note(String note) {
this(note.split(" x ")[0], Double.parseDouble(note.split(" x ")[1]));
}
/**
* Converts a pitch string to a MIDI value.
* The pitch "rest" should return {@link #REST_PITCH}.
*
* @param pitch the pitch to convert
* @throws NullPointerException if pitch is null
* @throws IllegalArgumentException is the String is not a legal pitch
* @return the MIDI value
*/
public static int toMidi(String pitch) {
// TODO
return -1;
}
/**
* Converts a MIDI value to a pitch string.
* The MIDI value 128 should return "rest".
*
* @param midiValue the MIDI value to convert
* @throws IllegalArgumentException if the MIDI value is outside of legal range
* @return the pitch string
*/
public static String toPitch(int midiValue) {
// TODO
return null;
}
/**
* Gets the pitch string of this note.
*
* @return the pitch
*/
public String getPitch() { return pitch; }
/**
* Gets the MIDI value of this note.
*
* @return the MIDI value
*/
public int getMidiPitch() { return midiValue; }
/**
* Gets the duration of this note.
*
* @return the duration
*/
public double getDuration() { return duration; }
/**
* Returns a new note with the same pitch, but with its duration multiplied by the parameter.
*
* @param factor the amount to scale by
* @throws IllegalArgumentException if resultant duration is outside of valid range
* @return the stretched note
*/
public Note stretch(double factor) {
// TODO
return null;
}
/**
* Returns a (new) note with the same duration, but transposed by the given interval.
*
* @param interval the interval to transpose by
* @throws IllegalArgumentException if note is transposed beyond valid bounds [c0, g10]
* @return the transposed note
*/
public Note transpose(int interval) {
// TODO
return null;
}
/**
* Returns a string representation of this Note.
* It should follow the format found in songs/InMyLife.song, namely:
* For a Note with pitch "g#4" and duration 1.0625 -> "g#4 x 1.0625"
* NB1: Identical spacing and format are important!
* NB2: For a "rest" note, the same format must be used (including duration).
*
* @return the string representation
*/
@Override
public String toString() {
// TODO
return null;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object o) {
// TODO: Return equal if the argument is a Note and the midiValue and duration are equal
return false;
}
@Override
public int hashCode() {
// TODO: Compute hash using pieces. (Don't take hash code of strings.)
return -1;
}
}
Explanation / Answer
public class Note {
/* Static Constants */
public static final int DEFAULT_INTENSITY = 50;
public static final int REST_PITCH = 128; // First illegal pitch, used for rests.
private static final int PITCHES_PER_OCTAVE = 12;
private static final String[] NOTE_LETTERS = {"c","c#","d","d#","e","f","f#","g","g#","a","a#","b"};
private static final double MIN_DURATION = 1.0/64, // One sixty-fourth
MAX_DURATION = 8.0; // Eight whole notes
/** Fields (Immutable) */
private final String pitch;
private final int midiValue;
private final double duration;
/**
* Instantiates a new note based on a string denoting note letter and octave.
*
* @param pitch the pitch (e.g. "f6")
* @param duration the duration
* @throws NullPointerException if pitch is null
* @throws IllegalArgumentException if:
* 1. The pitch parameter is malformed or out of range.
* 2. The duration parameter is out of range.
*/
public Note(String pitch, double duration) {
// TODO
// Recommended: First implement toMidi(String).
}
/**
* Instantiates a new note based on MIDI value.
*
* @param midiValue the MIDI value (e.g. 68)
* @param duration the duration
* @throws IllegalArgumentException if:
* 1. The MIDI pitch parameter is out of range.
* 2. The duration parameter is out of range.
*/
public Note(int midiValue, double duration) {
// TODO
// Recommended: First implement toPitch(int).
}
/**
* Instantiates a new note from a String matching the format of Note's toString() method.
*
* @param note the string representation
*
* @throws IndexOutOfBoundsException if parameter isn't in correct format
* @throws NumberFormatException if duration representation cannot be parsed as double
* @throws IllegalArgumentException if the elements in the format are not permitted.
*/
public Note(String note) {
this(note.split(" x ")[0], Double.parseDouble(note.split(" x ")[1]));
}
/**
* Converts a pitch string to a MIDI value.
* The pitch "rest" should return {@link #REST_PITCH}.
*
* @param pitch the pitch to convert
* @throws NullPointerException if pitch is null
* @throws IllegalArgumentException is the String is not a legal pitch
* @return the MIDI value
*/
public static int toMidi(String pitch) {
// TODO
return -1;
}
/**
* Converts a MIDI value to a pitch string.
* The MIDI value 128 should return "rest".
*
* @param midiValue the MIDI value to convert
* @throws IllegalArgumentException if the MIDI value is outside of legal range
* @return the pitch string
*/
public static String toPitch(int midiValue) {
// TODO
return null;
}
/**
* Gets the pitch string of this note.
*
* @return the pitch
*/
public String getPitch() { return pitch; }
/**
* Gets the MIDI value of this note.
*
* @return the MIDI value
*/
public int getMidiPitch() { return midiValue; }
/**
* Gets the duration of this note.
*
* @return the duration
*/
public double getDuration() { return duration; }
/**
* Returns a new note with the same pitch, but with its duration multiplied by the parameter.
*
* @param factor the amount to scale by
* @throws IllegalArgumentException if resultant duration is outside of valid range
* @return the stretched note
*/
public Note stretch(double factor) {
// TODO
return null;
}
/**
* Returns a (new) note with the same duration, but transposed by the given interval.
*
* @param interval the interval to transpose by
* @throws IllegalArgumentException if note is transposed beyond valid bounds [c0, g10]
* @return the transposed note
*/
public Note transpose(int interval) {
// TODO
return null;
}
/**
* Returns a string representation of this Note.
* It should follow the format found in songs/InMyLife.song, namely:
* For a Note with pitch "g#4" and duration 1.0625 -> "g#4 x 1.0625"
* NB1: Identical spacing and format are important!
* NB2: For a "rest" note, the same format must be used (including duration).
*
* @return the string representation
*/
@Override
public String toString() {
// TODO
return null;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object o) {
// TODO: Return equal if the argument is a Note and the midiValue and duration are equal
return false;
}
@Override
public int hashCode() {
// TODO: Compute hash using pieces. (Don't take hash code of strings.)
return -1;
}
}
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