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.
Consider a method that takes an int array and modifies it: public static void doubleArray(int[] arr) { for (int i = 0; i < arr.length; i++) { arr[i] *= 2; } }. What is the output of: int[] nums = {1, 2, 3}; doubleArray(nums); System.out.println(nums[1]);
4
The method doubles each element, so 2 becomes 4.
8
Why wrong: Would be 8 if squared, but it's multiplied by 2.
2
Why wrong: This is the original value before doubling.
3
Why wrong: Not the result of doubling.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
4
Option A is correct because the method `doubleArray` multiplies each element of the array by 2. The array `nums` is passed by reference, so modifications inside the method affect the original array. After execution, `nums[1]` (originally 2) becomes 4, which is printed.
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.
4
Why this is correct
The method doubles each element, so 2 becomes 4.
Related concept
Read the scenario before looking for a memorised answer.
8
Why it's wrong here
Would be 8 if squared, but it's multiplied by 2.
2
Why it's wrong here
This is the original value before doubling.
3
Why it's wrong here
Not the result of doubling.
Common exam traps
The trap here is that candidates often confuse pass-by-value for object references with pass-by-value for primitives, incorrectly assuming the array is copied and the original remains unchanged, leading them to pick the original value (option C).
Detailed technical explanation
In Java, arrays are objects, and when passed to a method, the reference to the array is passed by value. This means the method can modify the array's elements directly, as seen here with the `arr[i] *= 2` operation. Understanding this reference semantics is crucial for avoiding unintended side effects in real-world applications, such as when manipulating data structures in multi-threaded environments.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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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: 4 — Option A is correct because the method `doubleArray` multiplies each element of the array by 2. The array `nums` is passed by reference, so modifications inside the method affect the original array. After execution, `nums[1]` (originally 2) becomes 4, which is printed.
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 25, 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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