Hello,
You receive a string which includes a newline character ( ‘\n’ )
You need to remove the newline character ( ‘\n’ ) that is in the received string before splitting it so you can convert to an int.
Example:
https://processing.org/reference/trim_.html
https://processing.org/reference/String.html (discusses newline character and escape sequences such as \n)
String s1 = "123,456,890\n";
String [] list1 = split(s1, ',');
printArray(list1);
println(int(list1[2]));
println();
String s2 = "123,456,890\n";
s2 = trim(s2);
String [] list2 = split(s2, ',');
printArray(list2);
println(int(list2[2]));
println();