如何使用indexOf()正确划分传入数据?

我在我的电脑上用Processing 3.3.7创建了一个图形用户界面。微控制器通过COM8以

angle,distance.mindistance

接着是一条新线。我在微控制器上编写了一个简单的代码,它循环遍历一组数据,只是为了验证GUI是否正常工作。

处理时运行的代码

2. 查找的索引 "," 和 "."
3. 在位置之间分配 "0" "," 到变量 angle
4. 在索引之间赋值 "," 和索引 "." distance
5. 在索引之间赋值 并将数据的结尾改为变量 mindistance
6. 在GUI上做一些进一步的处理和可视化。

问题是 心灵距离 始终指定为0,表示步骤5有问题:

void serialEvent (Serial myPort) {}

但是 和 距离 正确显示。

我的代码的相关部分如下:

import processing.serial.*; // imports library for serial communication
import java.awt.event.KeyEvent; // imports library for reading the data from the serial port
import java.io.IOException;

Serial myPort; // defines Object Serial

String angle="";
String distance="";
String mindistance = "";
String data="";
String noObject;
float pixsDistance, pixsMinDist;
int iAngle, iDistance, iMinDistance;
int index1=0;
int index2=0;
PFont orcFont;
int linefeed = 10; // new line ASCII = 10

void setup() {

  size (1600, 900);
  smooth();
  myPort = new Serial(this, "COM8", 115200); // starts the serial communication
  myPort.bufferUntil(linefeed); //reads the data from the serial port up to the character 'n'. So actually it reads this: angle,distance.mindistance
  orcFont = loadFont("OCRAExtended-30.vlw");
}

void serialEvent (Serial myPort) { // starts reading data from the Serial Port
  // reads the data from the Serial Port up to the character 'n' and puts it into the String variable "data".
  data = myPort.readStringUntil(linefeed);
  data = data.substring(0, data.length()-1);

  index1 = data.indexOf(","); // find the character ',' and puts it into the variable "index1"
  index2 = data.indexOf(".");  // https://processing.org/reference/String_indexOf_.html
  angle= data.substring(0, index1); // read the data from position "0" to to the index of "."
  distance= data.substring(index1+1, index2); // read the data between index of "," and index of "."
  mindistance = data.substring(index2+1, data.length()); // read the data from index of "." to the end of the data

  // converts the String variables into Integer
  iAngle = int(angle);
  iDistance = int(distance);
  iMinDistance = int(mindistance);
}

void drawObject() {// limiting the range to 400 cm
    // some more code here
}

---编辑---

我发现 心灵距离 iMinDistance = int(mindistance); , iMinDistance 变为0。