Queries related to K&B SCJP 6 book

[Varshini Priya]

Hi

I have some queries related to the legal identifiers specified in the K&B SCJP 6 book (Page 5 under Legal Identifiers). In this page, they have given some examples of illegal identifiers. Can you please help me understand, why the below is considered as illegal identifier.

int e#;

As per the explanation provided, it states that Identifiers must start with a letter, a currency character ($), or a connecting
character such as the underscore ( _ ). Identifiers cannot start with a number. In the above case, the identifier starts with a letter 'e'. But not sure why it is considered as illegal identifier. Please explain.

Thanks in advance

[Campbell Ritchie]

You should find the explanation in the Java Language Specification.

[Praveen Kumar M K]

Hi Varshini,

In addition to the starting character restriction, the SCJP book also tells you that a legal identifier should only consist of a combination of either a letter, a $, a number or a connecting character. In your example, '#' is not a connecting character. Please go through the JLS link in the post above for complete details.