1Z0-811 Arrays and Methods Practice Question
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?
⚠ Common exam trap
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`.
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
✓
An ArrayIndexOutOfBoundsException is thrown.
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.
Answer analysis
Option-by-option breakdown
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.
Go deeper
Related to this question
About these practice questions
Courseiva writes every 1Z0-811 question from scratch — 481 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.