Which method identifier is correct according to Java naming conventions?

Question

Options

• ABillCalculator
• BcalculateBill
• Ccalculatebill
• DCalculator

• A
  5% (2)
• B
  3% (1)
• C
  3% (1)
• D
  90% (35)

Explanation

There appears to be an error in the provided answer key. The marked correct answer D (Calculator) is actually wrong for a method identifier - Calculator follows class naming conventions (PascalCase), not method conventions.

The actual correct answer is B: calculateBill

Here's the proper explanation:

calculateBill is correct because Java method names must follow lowerCamelCase - beginning with a lowercase letter, with each subsequent word capitalized. This is a core Java convention enforced by style guides and widely expected in professional code.

• A (BillCalculator) - PascalCase (UpperCamelCase) is reserved for class and interface names, not methods.
• C (calculatebill) - All lowercase with no word separation is not a recognized Java convention; it reduces readability.
• D (Calculator) - Also PascalCase, making it a valid class name, not a method name.

Memory tip: Think of methods as actions that are humble - they start lowercase because they serve the class, while classes are proper nouns that start uppercase (like BillCalculator). If it starts lowercase and uses camelCase, it's a method.

I'd recommend flagging this to whoever provided the question - the answer key has D marked as correct, which contradicts standard Java naming conventions.

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