Which of the following is not a valid identifier in Java?a)myVariableb...
Invalid Identifier in Java
An identifier is a name given to a variable, method, class, or other programming elements in Java. It is used to uniquely identify these elements within a program. Identifiers in Java must follow certain rules and conventions.
In the given options, the invalid identifier in Java is:
c) 123abcd
Explanation:
In Java, an identifier must adhere to the following rules:
1. It must start with a letter (a-z or A-Z), underscore (_), or a dollar sign ($).
2. After the first character, it can contain letters, digits, underscores, or dollar signs.
3. It cannot contain spaces or any special characters except underscore (_) or a dollar sign ($).
4. It cannot be a reserved word or keyword.
Let's analyze each option:
a) myVariable
- This is a valid identifier in Java as it starts with a letter and contains only letters.
b) _variable
- This is also a valid identifier in Java as it starts with an underscore and contains only letters.
c) 123abcd
- This is not a valid identifier in Java because it starts with a digit (number) instead of a letter, underscore, or dollar sign.
d) $price
- This is a valid identifier in Java as it starts with a dollar sign and contains only letters.
Conclusion:
The option c) 123abcd is not a valid identifier in Java as it violates the rule that an identifier must start with a letter, underscore, or a dollar sign.
Which of the following is not a valid identifier in Java?a)myVariableb...
123abc is not a valid identifier in Java as it starts with a digit, making option c the correct choice.
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