Method with name long. Sybex OCA Java 8 Study Guide

[Artem Petrov]

In book "OCA Oracle Certified Associate Java SE 8 Programmer I Study Guide" there is an error on page 170 in the next code

int integer() {
    return 9;
}
int long() {]
    return 9L; // DOES NOT COMPILE
}

The method cannot have name 'long' because it is a reserved word in Java (unless one of the letters is not from english alphabet, but it this case it should be mentioned in the description for this code).

[Mushfiq Mammadov]

Artem Petrov wrote:In book "OCA Oracle Certified Associate Java SE 8 Programmer I Study Guide" there is an error on page 170 in the next code

int integer() {
    return 9;
}
int long() {]
    return 9L; // DOES NOT COMPILE
}

The method cannot have name 'long' because it is a reserved word in Java (unless one of the letters is not from english alphabet, but it this case it should be mentioned in the description for this code).

This typo have already logged in errata page

[Roel De Nijs]

Hi Artem Petrov,

First of all, a warm welcome to CodeRanch!

Artem Petrov wrote:The method cannot have name 'long' because it is a reserved word in Java (unless one of the letters is not from english alphabet, but it this case it should be mentioned in the description for this code).

You are absolutely spot-on! You can't use Java keywords as identifiers (for methods, variables, classes,...). Don't forget: Java is case-sensitive, so long and lOng are two different names. The first one is not allowed as identifier, the second compiles without any problem.

void long() {} // compiler error
void lOng() {} // ok

So the above code snippet should be

int anInt() {
    return 9;
}
int aLong() {]
    return 9L; // DOES NOT COMPILE
}

Or intMethod and longMethod would be fine as well.

As Mushfiq already mentioned, this errata item was already added to the official list (which you can find here).

Hope it helps!
Kind regards,
Roel