Which of the following is a valid identifier in Java?
Analysis & Theory
Identifiers can start with a letter, `$`, or `_`. `_value` is valid. `1value` is invalid, `value-1` contains an illegal character, and `class` is a reserved keyword.
Which of the following is NOT a valid identifier in Java?
Analysis & Theory
`void` is a reserved keyword and cannot be used as an identifier.
What is the rule for Java identifiers?
A
They can start with a number
B
They must start with a letter, `$`, or `_`
C
They can contain spaces
D
They can include special characters like `@`
Analysis & Theory
Java identifiers must begin with a letter (A–Z or a–z), `$`, or `_`.
Which of the following are legal Java identifiers?
Analysis & Theory
`_name`, `$value`, and `total1` are valid identifiers. Others use illegal characters or keywords.
Can Java identifiers contain digits?
A
Yes, but not at the start
B
No, digits are not allowed
D
Only after a special character
Analysis & Theory
Digits can appear in identifiers but not as the first character.
Which identifier follows Java naming conventions for variables?
Analysis & Theory
`totalAmount` follows camelCase, which is the recommended naming convention for Java variables.
Which of these identifiers is a valid method name in Java?
Analysis & Theory
`_printData` is a valid identifier. Others are invalid or reserved keywords.
Which of the following are reserved keywords in Java and cannot be used as identifiers?
Analysis & Theory
`final`, `static`, and `int` are reserved keywords in Java.
Which of these identifiers is valid and correctly follows Java class naming conventions?
Analysis & Theory
`MyClass` follows PascalCase, which is the standard for class names in Java.
What is the maximum length of an identifier in Java?
D
No limit (except memory)
Analysis & Theory
Java does not impose a limit on identifier length, though compilers may have practical constraints.