Quick Answer
The correct answer is `public static int product(int... nums)`, because the three-dot ellipsis syntax `int...` is the proper Java varargs syntax for declaring a method that accepts a variable number of int arguments. When you use varargs, the compiler automatically packs all passed arguments into an array inside the method body, allowing you to iterate over `nums` to compute the product—even if zero arguments are passed, resulting in an empty array. On the Oracle Java Foundations 1Z0-811 exam, this question tests your ability to distinguish varargs from array parameters and overloaded methods; a common trap is choosing `int[] nums` instead, which requires explicitly creating an array at the call site. Remember that varargs must always be the last parameter in a method signature, and only one varargs parameter is allowed per method. A helpful memory tip: think of the three dots as saying “and so on…”—they signal that the method can take zero or more values of that type.
This 1Z0-811 practice question tests your understanding of arrays and methods. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer writes a method that accepts a variable number of int arguments and returns their product. Which method signature correctly implements this?
public static int product(int[] nums)
Why wrong: This is not varargs; it requires an array argument.
public static int product(int nums...)
Why wrong: Invalid syntax; ellipsis after type.
public static int product(int... nums)
Varargs correctly declared.
public static int product(int... nums, int extra)
Why wrong: Varargs must be the last parameter.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
public static int product(int... nums)
Option C is correct because the syntax `int... nums` is the proper Java varargs syntax, allowing a method to accept zero or more `int` arguments, which are then treated as an array inside the method. This enables the developer to call `product(2, 3, 4)` or `product()` and compute the product by iterating over the array.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
public static int product(int[] nums)
Why it's wrong here
This is not varargs; it requires an array argument.
public static int product(int nums...)
Why it's wrong here
Invalid syntax; ellipsis after type.
public static int product(int... nums)
Why this is correct
Varargs correctly declared.
Related concept
Read the scenario before looking for a memorised answer.
public static int product(int... nums, int extra)
Why it's wrong here
Varargs must be the last parameter.
Common exam traps
Oracle often tests the requirement that varargs must be the last parameter, and the trap here is that candidates might think `int nums...` is valid or that a regular array parameter qualifies as variable arguments.
Detailed technical explanation
Under the hood, Java varargs are syntactic sugar for an array parameter; the compiler converts `int... nums` to `int[] nums` and wraps the passed arguments into an array. A subtle behavior is that if you pass an array directly, it is used as-is, but if you pass individual values, a new array is created. In real-world scenarios like logging frameworks or mathematical utilities, varargs provide flexibility without overloading methods for different argument counts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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FAQ
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
The correct answer is: public static int product(int... nums) — Option C is correct because the syntax `int... nums` is the proper Java varargs syntax, allowing a method to accept zero or more `int` arguments, which are then treated as an array inside the method. This enables the developer to call `product(2, 3, 4)` or `product()` and compute the product by iterating over the array.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
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