- A
while(true) { sum += arr[i]; i++; }
Why wrong: Incorrect because the while(true) loop lacks a termination condition, causing an infinite loop. It also does not prevent array index out of bounds.
- B
for(int i=0; i<arr.length; i++) { sum += arr[i]; if(sum > 100) break; }
Correct. It uses a standard for loop with an index, sums each element, and breaks when sum exceeds 100.
- C
do { sum += arr[i]; i++; } while(i<arr.length && sum <= 100);
Why wrong: Incorrect because the do-while loop checks the condition after executing the body, so if the sum exceeds 100 during the loop, it will still add the next element before checking the condition.
- D
for(int val : arr) { sum += val; if(sum > 100) break; }
Correct. The enhanced for loop iterates over each element. The break statement works inside it, stopping early when sum exceeds 100.
1Z0-811 for loop Practice Question
This 1Z0-811 practice question tests your understanding of control flow and loops. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: for loop. 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 loop to iterate over an array of integers. The loop must sum all elements and stop early if the sum exceeds 100. Which control flow construct should be used?
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
for(int i=0; i<arr.length; i++) { sum += arr[i]; if(sum > 100) break; }
Both Option B and Option D are correct. Option B uses a standard for loop with an index, allowing direct array access and an early break when sum exceeds 100. Option D uses an enhanced for-each loop, which also correctly iterates over all elements and exits via break when the condition is met. Option A is incorrect because the while(true) loop has no termination condition and lacks array bounds checking. Option C is incorrect because the do-while loop checks the condition after the body, causing one extra iteration if the sum exceeds 100 during the loop.
Key principle: for loop
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
while(true) { sum += arr[i]; i++; }
Why it's wrong here
Incorrect because the while(true) loop lacks a termination condition, causing an infinite loop. It also does not prevent array index out of bounds.
- ✓
for(int i=0; i<arr.length; i++) { sum += arr[i]; if(sum > 100) break; }
Why this is correct
Correct. It uses a standard for loop with an index, sums each element, and breaks when sum exceeds 100.
Related concept
for loop
- ✗
do { sum += arr[i]; i++; } while(i<arr.length && sum <= 100);
Why it's wrong here
Incorrect because the do-while loop checks the condition after executing the body, so if the sum exceeds 100 during the loop, it will still add the next element before checking the condition.
- ✓
for(int val : arr) { sum += val; if(sum > 100) break; }
Why this is correct
Correct. The enhanced for loop iterates over each element. The break statement works inside it, stopping early when sum exceeds 100.
Related concept
for loop
Common exam traps
Common exam trap: answer the scenario, not the keyword
The key trap here is that candidates may assume only the indexed for loop (Option B) works, but the enhanced for loop (Option D) is equally valid for this task since it does not require an index. Many test-takers overlook that break works inside for-each loops as well.
Detailed technical explanation
How to think about this question
The break statement in Java is used to exit a loop prematurely, and it works with for, while, and do-while loops. In the context of array iteration, using an indexed for loop (Option B) gives explicit control over the loop variable, allowing precise management of the sum condition. The enhanced for loop (for-each) is designed for iterating over collections or arrays without index access, but it does not support break in all contexts; in Java, break is allowed in for-each loops over arrays, but the lack of index makes it less suitable when early exit is needed based on a cumulative condition.
KKey Concepts to Remember
- for loop
- enhanced for loop (for-each)
- break statement
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
for loop
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. for loop Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review for loop, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
Control Flow and Loops — This question tests Control Flow and Loops — for loop.
What is the correct answer to this question?
The correct answer is: for(int i=0; i<arr.length; i++) { sum += arr[i]; if(sum > 100) break; } — Both Option B and Option D are correct. Option B uses a standard for loop with an index, allowing direct array access and an early break when sum exceeds 100. Option D uses an enhanced for-each loop, which also correctly iterates over all elements and exits via break when the condition is met. Option A is incorrect because the while(true) loop has no termination condition and lacks array bounds checking. Option C is incorrect because the do-while loop checks the condition after the body, causing one extra iteration if the sum exceeds 100 during the loop.
What should I do if I get this 1Z0-811 question wrong?
Review for loop, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
for loop
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Last reviewed: Jun 30, 2026
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