How can I send multiple values from Processing to Arduino via Serial library?
Construct a byte array containing your data. Remember that each byte can only go up to 255, so if your int is larger than that you'll need to use multiple bytes per int. 

Then on the arduino 

while (Serial.available() &gt; 0) {
  Serial.read() //now do something with this byte
}


This will loop until there are no more bytes to read, and each time it will read one byte.