How can I parse String to int with the default value? [duplicate]

Answer 1

You can use this way with String::matches like this :

String userid = "user001";
int int_userid = userid.matches("\\d+") ? Integer.parseInt(userid) : 0;

You ca also use -?\d+ for both positive and negative values :

int int_userid = userid.matches("-?\\d+") ? Integer.parseInt(userid) : 0;