What is a Java identifier?

What is a Java identifier?

• A. A name used to identify variables, methods, classes, modules, and other user-defined items.
• B. A reserved keyword.
• C. A numeric literal.
• D. The main method.

Answer: (A)

An identifier is the name you give to a program element so you can refer to it in code. In Java, identifiers name variables, methods, classes, and other user-defined items, and that naming is how you talk about those elements in your program. They must start with a letter, underscore, or dollar sign, and can continue with letters, digits, underscores, or dollar signs. They can’t be Java reserved keywords (like if, else, class, public, etc.), and they’re case-sensitive, so myVar and MyVar are different. They also can’t contain spaces or most punctuation. Examples include counter, totalSum, MyClass, _temp, and $value. The main method has the name main, which is an identifier, but the idea here is about the general ability to name various program elements rather than about naming just that one method.

An identifier is the name you give to a program element so you can refer to it in code. In Java, identifiers name variables, methods, classes, and other user-defined items, and that naming is how you talk about those elements in your program. They must start with a letter, underscore, or dollar sign, and can continue with letters, digits, underscores, or dollar signs. They can’t be Java reserved keywords (like if, else, class, public, etc.), and they’re case-sensitive, so myVar and MyVar are different. They also can’t contain spaces or most punctuation.

Examples include counter, totalSum, MyClass, _temp, and $value. The main method has the name main, which is an identifier, but the idea here is about the general ability to name various program elements rather than about naming just that one method.