The correct answer is ArrayIndexOutOfBoundsException. This occurs because the loop condition i <= data.length allows i to reach 5, while the array data has valid indices only from 0 to 4, so accessing data[5] throws the exception. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of array bounds and loop conditions, a common trap where using <= instead of < causes an off-by-one error. The search intent “array index out of bounds exception loop condition” highlights exactly this pitfall: when iterating an array, always remember that the last valid index is length - 1. A simple memory tip is to think “less than length, not less than or equal” — or use the mnemonic “LTL” (Less Than Length) to avoid stepping past the array’s end.
1Z0-811 Control Flow and Loops 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. 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.
Exhibit
int[] data = {1, 2, 3, 4, 5};
int sum = 0;
for (int i = 0; i <= data.length; i++) {
sum += data[i];
}
System.out.println(sum);
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ArrayIndexOutOfBoundsException
Option C is correct because the loop condition i <= data.length causes i to become 5, which is an invalid index (valid indices 0-4). This results in an ArrayIndexOutOfBoundsException. Option A is wrong because the exception occurs before sum reaches 15. Option B is wrong because the code compiles successfully. Option D is wrong because sum is not 0.
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.
✗
15
Why it's wrong here
The loop would attempt to access index 5, causing an exception before sum becomes 15.
✓
ArrayIndexOutOfBoundsException
Why this is correct
When i equals 5, data[5] is out of bounds, throwing an exception.
Related concept
Read the scenario before looking for a memorised answer.
✗
0
Why it's wrong here
The sum is not 0; the loop runs and adds values until the exception.
✗
Compilation fails
Why it's wrong here
The code compiles without errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
Got this wrong? Here's your next step.
Identify which 1Z0-811 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Control Flow and Loops — This question tests Control Flow and Loops — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ArrayIndexOutOfBoundsException — Option C is correct because the loop condition i <= data.length causes i to become 5, which is an invalid index (valid indices 0-4). This results in an ArrayIndexOutOfBoundsException. Option A is wrong because the exception occurs before sum reaches 15. Option B is wrong because the code compiles successfully. Option D is wrong because sum is not 0.
What should I do if I get this 1Z0-811 question wrong?
Identify which 1Z0-811 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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