Help me if you can please

How do I convert a variable of type byte to integer.
I am using Arduino and must capture data from serial port and stored in a variable to work. But the data comes from the serial port type byte.

Thanks

My code is

import processing.serial.*;

Serial myPort;

void setup() {
 
 println(Serial.list());

 myPort = new Serial(this, Serial.list()[0], 9600);
 
}

void draw()
{
 
 byte[] inBuffer = new byte[7];
 while (myPort.available() > 0)
 {
   inBuffer = myPort.readBytes();
   myPort.readBytes(inBuffer);
   if (inBuffer != null) {
     String myString = new String(inBuffer);
     print(myString);
     
     
   }
 }
         
}