A legal Java identifier must start with a letter, underscore, or dollar sign, and can only contain letters, digits, underscores, or dollar signs, without any spaces or special characters. Among the given options, only 'i' is a valid identifier. 'class' is a keyword, and the others contain invalid characters.
In Java, legal identifiers must start with a letter, underscore, or dollar sign and can be followed by any combination of letters, digits, underscores, or dollar signs. They cannot be Java keywords. Following these rules, the options provided are evaluated:
- A) i is a valid identifier, as it starts with a letter.
- B) class is not valid because it is a Java keyword.
- C) idon'tlikeclass is not valid because it contains an apostrophe, which is not allowed.
- D) i-like-class is not valid as it contains hyphens, which are not allowed in identifiers.
Therefore, the correct answer is A) i.
So, when choosing a legal identifier for Java, ensure it adheres to the proper format and is not a reserved keyword.