Which of the following is a valid identifier in Java?Options_identifier123identifier#identifieridentifier-123
Question
Which of the following is a valid identifier in Java?Options_identifier123identifier#identifieridentifier-123
Solution
The valid identifier in Java from the given options is "identifier123".
In Java, a valid identifier can start with a letter, a dollar sign ($), or an underscore (_). After the first character, an identifier can have any combination of characters. A keyword cannot be used as an identifier.
Most importantly, in Java, identifiers are case sensitive.
Here's why the other options are not valid:
- "identifier" is not valid because it starts with an underscore ().
- "identifier#" is not valid because it contains a hash (#) symbol.
- "identifier-123" is not valid because it contains a hyphen (-).
So, the only valid identifier in the given options is "identifier123".
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