Can Java identifiers contain punctuation such as @, %, or $?

Can Java identifiers contain punctuation such as @, %, or $?

• A. No
• B. Yes
• C. Sometimes
• D. Only $

Answer: (A)

Identifiers in Java are names used for classes, methods, and variables. They must start with a letter, underscore, or dollar sign, and the rest of the characters can be letters, digits, underscores, or dollar signs. They cannot be keywords and cannot include whitespace or most punctuation. In the set you mentioned, the at-sign and the percent sign are not allowed in identifiers, but the dollar sign is allowed. So Java identifiers can contain the dollar sign, but not @ or %. For example, valid: myVar, _temp, $value, a1; invalid: my@var, percent%d. The key takeaway is that the dollar sign is acceptable, while @ and % are not.

Identifiers in Java are names used for classes, methods, and variables. They must start with a letter, underscore, or dollar sign, and the rest of the characters can be letters, digits, underscores, or dollar signs. They cannot be keywords and cannot include whitespace or most punctuation.

In the set you mentioned, the at-sign and the percent sign are not allowed in identifiers, but the dollar sign is allowed. So Java identifiers can contain the dollar sign, but not @ or %. For example, valid: myVar, _temp, $value, a1; invalid: my@var, percent%d. The key takeaway is that the dollar sign is acceptable, while @ and % are not.