Question 1easymultiple choice
Full question →- A
100
Sums all four elements correctly.
- B
30
Why wrong: Only sums first two elements.
- C
60
Why wrong: Only sums first three elements.
- D
140
Why wrong: Would require an extra element beyond array length.
Question 186 of 509
Quick Answer
The answer is 100. This is correct because the for loop iterates through each element of the array {10, 20, 30, 40}, using the index i from 0 to nums.length - 1, and adds each element to the sum variable, which starts at 0. The operation sum += nums[i] accumulates the values sequentially: 0 + 10 = 10, then 10 + 20 = 30, then 30 + 30 = 60, and finally 60 + 40 = 100. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of array traversal and accumulator patterns, a fundamental skill for summing array elements with a for loop. A common trap is miscounting the loop bounds or forgetting that array indices start at 0, but here the condition i < nums.length ensures all four elements are included. Memory tip: think of the sum as a running total—each pass of the loop adds the next array value, so for a four-element array, just add them in order: 10 + 20 + 30 + 40 = 100.
1Z0-811 Arrays and Methods Practice Question
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.
Given the code snippet: 'int[] nums = {10, 20, 30, 40}; int sum = 0; for (int i = 0; i < nums.length; i++) { sum += nums[i]; }'. What is the value of sum after execution?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
100
The correct answer is A (100) because the for loop iterates over each element of the array {10, 20, 30, 40} and adds it to the sum variable. The sum starts at 0, and after adding 10, 20, 30, and 40, the total becomes 100.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
100
Why this is correct
Sums all four elements correctly.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
30
Why it's wrong here
Only sums first two elements.
- ✗
60
Why it's wrong here
Only sums first three elements.
- ✗
140
Why it's wrong here
Would require an extra element beyond array length.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests whether candidates correctly compute the sum of all array elements versus partial sums, exploiting the common mistake of misinterpreting loop bounds or array indices.
Detailed technical explanation
How to think about this question
In Java, array indices start at 0, and the for loop condition 'i < nums.length' ensures the loop runs exactly 4 times (i = 0, 1, 2, 3). The compound assignment operator '+=' adds the current element to the running total, which is a common pattern for calculating sums in iterative algorithms. This concept is fundamental for processing collections in Java, such as aggregating scores or calculating averages in real-world applications.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Questions learners often ask
What does this 1Z0-811 question test?
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 100 — The correct answer is A (100) because the for loop iterates over each element of the array {10, 20, 30, 40} and adds it to the sum variable. The sum starts at 0, and after adding 10, 20, 30, and 40, the total becomes 100.
What should I do if I get this 1Z0-811 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
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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