Arduino serial data split string into array

/*
 * This procedure is suitable for unclassified "111,426" style strings
   * After segmentation, numdata[0]=111,numdata[1]=426
   * And numdata[0] and numdata[1] are integer numbers
*/
#define numdata_length 2
String comdata = "";
int numdata[numdata_length] = {0};
int flag = 0;
void setup() {
  Serial.begin(9600);
  }
void loop() {
int j = 0;
 //Continuously check the serial port buffer in a loop, read the string one by one
while (Serial.available() > 0)
{
  comdata += char(Serial.read());
  delay(2);
  flag = 1;
}
 //If data is received, perform comdata analysis operation, otherwise do nothing
if(flag == 1) {
for(int i = 0; i < comdata.length() ; i++){
  if(comdata[i] == ','){
    j++;
    }
  else{
    numdata[j] = numdata[j] * 10 + (comdata[i] - '0');
    }
  }
comdata = String("");
flag = 0;
for(int i = 0; i < numdata_length; i++){
  Serial.println(numdata[i]);
  numdata[i] = 0;
  }
}
}

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