arduino receives string and int data through serial port

The arduino (0, 1) pin serial port is connected to HC-05 Bluetooth, which can be connected to other Bluetooth or Android mobile phone Bluetooth

The source code of serial port receiving string type data is as follows

String comdata = "";
void setup()
{
    Serial.begin(9600);
}

void loop()
{
    while (Serial.available() > 0){
        comdata += char(Serial.read()); //Read one char character each time and add them
        delay(2);
    }
    if (comdata.length() > 0){
                 Serial.println(comdata); //Print the received characters
        comdata = "";
    }
}

The source code of serial port receiving int type data is as follows

int p;
void setup(){
  Serial.begin(9600);
}

void loop(){
 While (Serial.available()> 0) {// The number of characters received by the serial port is greater than zero.
         p = Serial.parseInt(); // Find a valid integer in the serial data stream.
         Serial.println(p); //Print the received number
    }
}

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