Quick Answer
The correct answer is that an ArrayIndexOutOfBoundsException is thrown. This occurs because the loop condition `i <= arr.length` creates a classic off-by-one error: when `i` reaches 5, the condition is still true, but valid array indices only go from 0 to 4, so accessing `arr[5]` throws the exception before `arr[0]` can be printed. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of array bounds and loop termination conditions—a frequent trap where `<=` is mistakenly used instead of `<`. The search intent "array index out of bounds loop" directly points to this common pitfall where developers forget that arrays are zero-indexed and that `arr.length` returns the count of elements, not the last valid index. To avoid this, remember the memory tip: "Use `<` for zero-based arrays; `<=` is one too many."
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 the following code:
int[] arr = new int[5];
for (int i = 0; i <= arr.length; i++) {arr[i] = i;
}
System.out.println(arr[0]);
What is the result?
0
Why wrong: The exception occurs before printing, so 0 is not printed.
5
Why wrong: 5 is never assigned because the exception occurs when i is 5.
4
Why wrong: 4 would be printed if the loop ran successfully up to index 4, but it fails at index 5.
An ArrayIndexOutOfBoundsException is thrown.
The loop runs i from 0 to 5 inclusive; when i equals 5, arr[5] is out of bounds, causing the exception.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
An ArrayIndexOutOfBoundsException is thrown.
The correct answer is D because the loop condition `i <= arr.length` causes `i` to iterate from 0 to 5 inclusive. Since `arr` has indices 0 through 4, accessing `arr[5]` throws an `ArrayIndexOutOfBoundsException`. The exception occurs before `arr[0]` can be 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.
0
Why it's wrong here
The exception occurs before printing, so 0 is not printed.
5
Why it's wrong here
5 is never assigned because the exception occurs when i is 5.
4
Why it's wrong here
4 would be printed if the loop ran successfully up to index 4, but it fails at index 5.
An ArrayIndexOutOfBoundsException is thrown.
Why this is correct
The loop runs i from 0 to 5 inclusive; when i equals 5, arr[5] is out of bounds, causing the exception.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often overlook the off-by-one error in the loop condition `i <= arr.length` and assume the loop runs correctly, forgetting that array indices start at 0 and end at `length - 1`.
Detailed technical explanation
In Java, arrays are zero-indexed with a fixed length set at creation. The `length` field returns the number of elements, so valid indices are 0 to `length - 1`. Using `<=` in the loop condition is a classic off-by-one error that leads to an `ArrayIndexOutOfBoundsException` at runtime. This exception is unchecked and must be handled carefully in production code, especially when processing user input or dynamic data.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Arrays and Methods — study guide chapter
Learn the concepts, then practise the questions
Arrays and Methods practice questions
Targeted practice on this topic area only
All 1Z0-811 questions
509 questions across all exam domains
Oracle Java Foundations 1Z0-811 study guide
Full concept coverage aligned to exam objectives
1Z0-811 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise 1Z0-811 questions linked to What is Java.
Practise 1Z0-811 questions linked to Java Basics and Syntax.
Practise 1Z0-811 questions linked to Primitives, Strings and Operators.
Practise 1Z0-811 questions linked to Control Flow and Loops.
Practise 1Z0-811 questions linked to Arrays and Methods.
Practise 1Z0-811 questions linked to Object-Oriented Programming.
Practise 1Z0-811 questions linked to Exception Handling and Development Tools.
Practise 1Z0-811 questions linked to 1Z0-811 fundamentals.
Practise 1Z0-811 questions linked to 1Z0-811 scenario.
Practise 1Z0-811 questions linked to 1Z0-811 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
The correct answer is: An ArrayIndexOutOfBoundsException is thrown. — The correct answer is D because the loop condition `i <= arr.length` causes `i` to iterate from 0 to 5 inclusive. Since `arr` has indices 0 through 4, accessing `arr[5]` throws an `ArrayIndexOutOfBoundsException`. The exception occurs before `arr[0]` can be 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. The code at line 6 of ArrayExample.java is: int[] arr = {10, 20, 30, 40, 50}; int sum = 0; for (int i = 0; i <= arr.length; i++) sum += arr[i]; Which change fixes the exception?
hardWhy C: Option A corrects the loop condition to avoid accessing index arr.length. Option B changes the start index, still causes out of bounds. Option C fixes the length but not the loop condition. Option D changes the array size but not the loop.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.