我正在研究一个方法，其参数是音程的字符串和String根音符。例如，音乐中的小音阶是以下间隔：
1 2 b3 4 5 b6 b7 8并给出根音C，输出应为：
C4 D4 Eb4 F4 G4 Ab4 Bb4 C5
我也试图包括所有改变的区间，ex: b9, #9, b5, b11, b13.基本八度音程假定为4.如果区间大于八度音程，它应该添加多个八度音程，它跨越到4.理论上，方法应该能够将极大的间隔处理成音符，例如1400的间隔，这将超过人类听觉的范围。
我是怎么做到这一点的？我创建了一个局部变量String'interval'来单独存储每个间隔以进行处理，一个局部变量'noteValue'用于将间隔值保持为半步，一个局部变量'notes'用于包含转换后的音符。我获取所有间隔的输入字符串，并为for循环中的每个位置i创建子字符串“c”。我测试该子字符串中的字符是数字0-9，'b'（平面符号）还是'＃'（尖锐符号）。否则，假设遇到了一个空格，局部变量'interval'继续处理。
如果String c的字符是数字0-9，则将其添加到String间隔。如果String c的字符是'b'noteValue递减，如果是'＃'，则noteValue递增，每次递增。
例如，如果输入b13间隔，则应处理'b'并将noteValue减1。然后应将“1”添加到名称间隔的字符串中。然后读取'3'并将其添加到名称间隔的字符串中。在子串c中的字符不是数字'b'或'＃'之后，值为“13”的字符串间隔继续转换为半步。它被解析成一个 整数并根据主刻度的半步值（所有间隔与之比较）进行转换。 b13的半步值应为八度（12）+ a b6（8）= 20.
假设根音是C，则b13应该返回Ab。这是使用一系列if语句来查找正确的根音符，每个音符都包含一个开关。通过应用％12操作从0到11个可能的半步位置找到音符值，确定音符值并将其添加到音符字符串中。处理完整个intervalString参数后，应返回notes String。
我遇到了第38行的NumberFormatException问题，我尝试将'interval'字符串解析为整数。我已经放置了一个println（）语句来查看发生了什么，并且看起来String间隔没有正确更新。不确定从哪里开始，任何帮助将不胜感激！
这是我的代码：
public class testIntervals {
public static void main(String[] args) {
new testIntervals();
}
public testIntervals() {
String intervals = "1 2 b3 4 5 b6 b7 8";
String rootNote = "C";
String notes = intervalsToNotes(intervals, rootNote);
System.out.println(notes);
}
public String intervalsToNotes(String intervalString, String rootNote) {
int noteValue = 0;
int octave = 4;
String interval = "";
String notes = "";
for (int i = 0; i < intervalString.length(); i++) {
String c = intervalString.substring(i);
System.out.println(c);
if (c.charAt(0) >= '0' && c.charAt(0) <= '9')
interval = interval.concat(c);
else if (c.charAt(0) == 'b')
noteValue--;
else if (c.charAt(0) == '#')
noteValue++;
else {
System.out.println(interval + c);
int process = Integer.parseInt(interval);
interval = "";
for (int j = 1; i <= process; i++) {
if (j%7 == 2 || j%7 == 3 || j%7 == 5 || j%7 == 6 || j%7 == 0) {
noteValue += 2;
}
else if (j%7 == 1 || j%7 == 4) {
noteValue++;
}
}
octave += (noteValue / 12);
if (rootNote.equals("Ab") || rootNote.equals("G#")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("A" + octave + " ");break;
case 2: notes = notes.concat("Bb" + octave + " ");break;
case 3: notes = notes.concat("B" + octave + " ");break;
case 4: notes = notes.concat("C" + octave + " ");break;
case 5: notes = notes.concat("Db" + octave + " ");break;
case 6: notes = notes.concat("D" + octave + " ");break;
case 7: notes = notes.concat("Eb" + octave + " ");break;
case 8: notes = notes.concat("E" + octave + " ");break;
case 9: notes = notes.concat("F" + octave + " ");break;
case 10: notes = notes.concat("Gb" + octave + " ");break;
case 11: notes = notes.concat("G" + octave + " ");break;
}
}
else if (rootNote.equals("A")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("Bb" + octave + " ");break;
case 2: notes = notes.concat("B" + octave + " ");break;
case 3: notes = notes.concat("C" + octave + " ");break;
case 4: notes = notes.concat("C#" + octave + " ");break;
case 5: notes = notes.concat("D" + octave + " ");break;
case 6: notes = notes.concat("D#" + octave + " ");break;
case 7: notes = notes.concat("E" + octave + " ");break;
case 8: notes = notes.concat("F" + octave + " ");break;
case 9: notes = notes.concat("F#" + octave + " ");break;
case 10: notes = notes.concat("G" + octave + " ");break;
case 11: notes = notes.concat("G#" + octave + " ");break;
}
}
else if (rootNote.equals("A#") || rootNote.equals("Bb")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("B" + octave + " ");break;
case 2: notes = notes.concat("C" + octave + " ");break;
case 3: notes = notes.concat("Db" + octave + " ");break;
case 4: notes = notes.concat("D" + octave + " ");break;
case 5: notes = notes.concat("Eb" + octave + " ");break;
case 6: notes = notes.concat("E" + octave + " ");break;
case 7: notes = notes.concat("F" + octave + " ");break;
case 8: notes = notes.concat("Gb" + octave + " ");break;
case 9: notes = notes.concat("G" + octave + " ");break;
case 10: notes = notes.concat("Ab" + octave + " ");break;
case 11: notes = notes.concat("A" + octave + " ");break;
}
}
else if (rootNote.equals("B") || rootNote.equals("Cb")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("C" + octave + " ");break;
case 2: notes = notes.concat("C#" + octave + " ");break;
case 3: notes = notes.concat("D" + octave + " ");break;
case 4: notes = notes.concat("D#" + octave + " ");break;
case 5: notes = notes.concat("E" + octave + " ");break;
case 6: notes = notes.concat("F" + octave + " ");break;
case 7: notes = notes.concat("F#" + octave + " ");break;
case 8: notes = notes.concat("G" + octave + " ");break;
case 9: notes = notes.concat("G#" + octave + " ");break;
case 10: notes = notes.concat("A" + octave + " ");break;
case 11: notes = notes.concat("A#" + octave + " ");break;
}
}
else if (rootNote.equals("B#") || rootNote.equals("C")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("C#" + octave + " ");break;
case 2: notes = notes.concat("D" + octave + " ");break;
case 3: notes = notes.concat("D#" + octave + " ");break;
case 4: notes = notes.concat("E" + octave + " ");break;
case 5: notes = notes.concat("F" + octave + " ");break;
case 6: notes = notes.concat("F#" + octave + " ");break;
case 7: notes = notes.concat("G" + octave + " ");break;
case 8: notes = notes.concat("G#" + octave + " ");break;
case 9: notes = notes.concat("A" + octave + " ");break;
case 10: notes = notes.concat("A#" + octave + " ");break;
case 11: notes = notes.concat("B" + octave + " ");break;
}
}
else if (rootNote.equals("C#") || rootNote.equals("Db")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("D" + octave + " ");break;
case 2: notes = notes.concat("D#" + octave + " ");break;
case 3: notes = notes.concat("E" + octave + " ");break;
case 4: notes = notes.concat("F" + octave + " ");break;
case 5: notes = notes.concat("F#" + octave + " ");break;
case 6: notes = notes.concat("G" + octave + " ");break;
case 7: notes = notes.concat("G#" + octave + " ");break;
case 8: notes = notes.concat("A" + octave + " ");break;
case 9: notes = notes.concat("A#" + octave + " ");break;
case 10: notes = notes.concat("B" + octave + " ");break;
case 11: notes = notes.concat("C" + octave + " ");break;
}
}
else if (rootNote.equals("D")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("D#" + octave + " ");break;
case 2: notes = notes.concat("E" + octave + " ");break;
case 3: notes = notes.concat("F" + octave + " ");break;
case 4: notes = notes.concat("F#" + octave + " ");break;
case 5: notes = notes.concat("G" + octave + " ");break;
case 6: notes = notes.concat("G#" + octave + " ");break;
case 7: notes = notes.concat("A" + octave + " ");break;
case 8: notes = notes.concat("A#" + octave + " ");break;
case 9: notes = notes.concat("B" + octave + " ");break;
case 10: notes = notes.concat("C" + octave + " ");break;
case 11: notes = notes.concat("C#" + octave + " ");break;
}
}
else if (rootNote.equals("D#") || rootNote.equals("Eb")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("E" + octave + " ");break;
case 2: notes = notes.concat("F" + octave + " ");break;
case 3: notes = notes.concat("F#" + octave + " ");break;
case 4: notes = notes.concat("G" + octave + " ");break;
case 5: notes = notes.concat("G#" + octave + " ");break;
case 6: notes = notes.concat("A" + octave + " ");break;
case 7: notes = notes.concat("A#" + octave + " ");break;
case 8: notes = notes.concat("B" + octave + " ");break;
case 9: notes = notes.concat("C" + octave + " ");break;
case 10: notes = notes.concat("C#" + octave + " ");break;
case 11: notes = notes.concat("D" + octave + " ");break;
}
}
else if (rootNote.equals("E") || rootNote.equals("Fb")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("F" + octave + " ");break;
case 2: notes = notes.concat("F#" + octave + " ");break;
case 3: notes = notes.concat("G" + octave + " ");break;
case 4: notes = notes.concat("G#" + octave + " ");break;
case 5: notes = notes.concat("A" + octave + " ");break;
case 6: notes = notes.concat("A#" + octave + " ");break;
case 7: notes = notes.concat("B" + octave + " ");break;
case 8: notes = notes.concat("C" + octave + " ");break;
case 9: notes = notes.concat("C#" + octave + " ");break;
case 10: notes = notes.concat("D" + octave + " ");break;
case 11: notes = notes.concat("D#" + octave + " ");break;
}
}
else if (rootNote.equals("E#") || rootNote.equals("F")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("F#" + octave + " ");break;
case 2: notes = notes.concat("G" + octave + " ");break;
case 3: notes = notes.concat("G#" + octave + " ");break;
case 4: notes = notes.concat("A" + octave + " ");break;
case 5: notes = notes.concat("A#" + octave + " ");break;
case 6: notes = notes.concat("B" + octave + " ");break;
case 7: notes = notes.concat("C" + octave + " ");break;
case 8: notes = notes.concat("C#" + octave + " ");break;
case 9: notes = notes.concat("D" + octave + " ");break;
case 10: notes = notes.concat("D#" + octave + " ");break;
case 11: notes = notes.concat("E" + octave + " ");break;
}
}
else if (rootNote.equals("F#") || rootNote.equals("Gb")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("G" + octave + " ");break;
case 2: notes = notes.concat("G#" + octave + " ");break;
case 3: notes = notes.concat("A" + octave + " ");break;
case 4: notes = notes.concat("A#" + octave + " ");break;
case 5: notes = notes.concat("B" + octave + " ");break;
case 6: notes = notes.concat("C" + octave + " ");break;
case 7: notes = notes.concat("C#" + octave + " ");break;
case 8: notes = notes.concat("D" + octave + " ");break;
case 9: notes = notes.concat("D#" + octave + " ");break;
case 10: notes = notes.concat("E" + octave + " ");break;
case 11: notes = notes.concat("F" + octave + " ");break;
}
}
else if (rootNote.equals("G")) {
switch (noteValue % 12) {
case 0: notes = notes.concat(rootNote + octave + " ");break;
case 1: notes = notes.concat("G#" + octave + " ");break;
case 2: notes = notes.concat("A" + octave + " ");break;
case 3: notes = notes.concat("A#" + octave + " ");break;
case 4: notes = notes.concat("B" + octave + " ");break;
case 5: notes = notes.concat("C" + octave + " ");break;
case 6: notes = notes.concat("C#" + octave + " ");break;
case 7: notes = notes.concat("D" + octave + " ");break;
case 8: notes = notes.concat("D#" + octave + " ");break;
case 9: notes = notes.concat("E" + octave + " ");break;
case 10: notes = notes.concat("F" + octave + " ");break;
case 11: notes = notes.concat("F#" + octave + " ");break;
}
}
}
}
return notes;
}
答案 0 :(得分：0)
您不小心连接了不可转换的字符串：interval = interval.concat(c);（第31行）。我认为它应该是interval = interval.concat(c.charAt(0));