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

Answer 1

String userid = "user001";
int int_userid = Integer.parseInt(userid) != null ? Integer.parseInt(userid) : 0);

Did you mean this syntax? But since an int can never be null you have to instead do:

String userid = "user001";
int int_userid;
try { 
    int_userid= Integer.parseInt(userid);
} catch (NumberFormatexception e) {
    int_userid = 0;
}