Java 音程到音符的转换方法，遇到数字格式异常

我正在研究一种方法，其参数是一串音乐间隔和一串根音符。例如，音乐中的小调音阶为以下音程：

1 2 b3 4 5 b6 b7 8

给定根注释C，输出应为：

C4 D4 Eb4 F4 G4 Ab4 Bb4 C5

我还试图包括所有改变的音程，

例如：b9、#9、b5、b11、b13。

基本倍频程假定为4。如果音程大于一个八度音程，则应将它跨越的八度音程增加到4。理论上，这种方法应该能够将非常大的间隔处理成音符，例如1400的间隔，这将超过人类的听力范围

我是怎么做到的？我创建了一个局部变量字符串“interval”来单独存储每个间隔以进行处理，一个局部变量“noteValue”以半步保存间隔值，以及一个局部变量“notes”来包含转换后的注释。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创建一个子字符串“c”。我测试该子字符串中的字符是数字0-9、“b”（平号）还是“#”（锐号）。否则，假定遇到了一个空格，局部变量“interval”将继续处理

如果字符串c的字符是数字0-9，则会将其添加到字符串间隔中。如果字符串c的字符为“b”，则noteValue递减，如果为“#”，则noteValue递增，每递增一个

例如，如果输入了b13间隔，则应处理“b”，并将noteValue减量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字符串中。在子字符串c中的字符不是数字“b”或“#”之后，值为“13”的字符串间隔将继续转换为半步。它被解析为 整数，并根据主刻度的半步值进行转换（所有间隔都与之进行比较）。b13的半阶值应为八度（12）+b6（8）=20

假设根注释是C，b13应该返回Ab。这是通过使用一系列if语句来查找正确的根注释来完成的，每个语句都包含一个开关。通过应用%12操作从0到11个可能的半步位置查找注释值，确定注释值并将其添加到注释字符串中。处理完整个intervalString参数后，应返回notes字符串

我在第38行遇到了NumberFormatException问题，我试图将“interval”字符串解析为整数。我放置了一个println（）语句来查看发生了什么，字符串间隔似乎没有正确更新。不太确定从这里到哪里去，任何帮助都将不胜感激

这是我的密码：

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;
}

公共类测试间隔{
公共静态void main（字符串[]args）{
新的睾丸间期（）；
}
公开作证次数（）{
字符串间隔=“1 2 b3 4 5 b6 b7 8”；
字符串rootNote=“C”；
字符串注释=间隔注释（间隔，根注释）；
系统输出打印项次（备注）；
}
公共字符串intervalsToNotes（字符串intervalString，字符串rootNote）{
int noteValue=0；
int倍频程=4；
字符串间隔=”；
弦乐=”；
对于（int i=0；i如果（c.charAt（0）>='0'&&c.charAt（0）您意外地连接了一个不可转换的字符串：
interval=interval.concat（c）；
（第31行）。我认为应该是
interval=interval.concat（c.charAt（0））；
您意外连接了一个不可转换的字符串：
interval=interval.concat（c）；
（第31行）我认为应该是
interval=interval.concat（c.charAt（0））；