public class Note {

    public enum Lengths {
        DOUBLE_WHOLE_NOTE(0.5f),
        ...
        SIXTYFOURTH_NOTE(64);

        private float length;

        Lengths(float length) {

            this.length = length;
        }

        public float getLength() {

            return length;
        }

        private static final Map<Float, Lengths> lookup = new HashMap<Float, Lengths>();
        static {
            for (Lengths length : Lengths.values())
                lookup.put(length.getLength(), length);
        }

        public static Lengths get(float length) {

            return lookup.get(length);
        }

    }

    public enum Names {
        C(0),
        ...
        REST(-1);

        private final int number;

        Names(int number) {

            this.number = number;
        }

        public int getValue() {

            return number;
        }

        private static final Map<Integer, Names> lookup = new HashMap<Integer, Names>();
        static {
            for (Names name : Names.values())
                lookup.put(name.getValue(), name);
        }

        public static Names get(Integer value) {

            return lookup.get(value);
        }

    }

    private int pitch;
    private float length;

    public int getPitch() {

        return pitch;
    }

    public void setPitch(int pitch) {

        this.pitch = pitch;
    }

    public float getLength() {

        return length;
    }

    public void setLength(float length) {

        this.length = length;
    }

    private Note(int pitch, float length) {

        this.length = length;
        this.pitch = pitch;
    }

    public int getOctave() {

        return (pitch / 12) - 5;
    }

    public Note.Names getNameOfNote() {

        return Names.get(this.getPitch() % 12);
    }

    public Note.Lengths getLengthOfNote() {

        return Lengths.get(this.getLength());
    }

}

Cars audi = new Cars();

Car bmw = new Car();

public float getLength() {

     return length;
 }

public float getDuration() {

       return duration;
 }

public Note.Names getNameOfNote() {

      return Names.get(this.getPitch() % 12);
}

public int getPitchClass() {

      return (this.getPitch() % 12 + 12) % 12;
}

public Note.Names getScientificPitchClassName() {

      return Names.get(this.getPitchClass());
}