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.
Exhibit
Refer to the exhibit.
public class ArrayExample {
public static void main(String[] args) {
int[] numbers = {1, 2, 3, 4, 5};
modifyArray(numbers);
System.out.println(numbers[0]);
}
public static void modifyArray(int[] arr) {
arr[0] = 99;
}
}
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
99
The code initializes an array of size 5, then attempts to assign the value 99 to index 5. Since array indices in Java are zero-based, valid indices are 0 through 4. Index 5 is out of bounds, so an ArrayIndexOutOfBoundsException is thrown at runtime. Option C is incorrect because the code does not compile or output 99; it throws an exception.
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.
✗
1
Why it's wrong here
1 is the original value, but it is changed to 99.
✗
Compilation error
Why it's wrong here
The code compiles and runs without error.
✓
99
Why this is correct
The method sets numbers[0] to 99, so that is printed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Runtime exception
Why it's wrong here
No exception occurs; the array is accessed correctly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the off-by-one misconception where candidates think array indices start at 1, leading them to believe index 5 is valid for a 5-element array, but the correct last index is 4.
Detailed technical explanation
How to think about this question
In Java, arrays are objects with a fixed length determined at creation. Accessing an index outside the range 0 to length-1 throws an ArrayIndexOutOfBoundsException, a subclass of RuntimeException. This is a common off-by-one error; developers often forget that the last valid index is length-1, not length. In real-world scenarios, such errors can cause application crashes if not caught, highlighting the importance of bounds checking or using enhanced for-loops.
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: 99 — The code initializes an array of size 5, then attempts to assign the value 99 to index 5. Since array indices in Java are zero-based, valid indices are 0 through 4. Index 5 is out of bounds, so an ArrayIndexOutOfBoundsException is thrown at runtime. Option C is incorrect because the code does not compile or output 99; it throws an exception.
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.
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 →
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.
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.