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. A key principle to apply: binarySearch. 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 Search {
public static int findIndex(int[] arr, int value) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] == value) {
return i;
}
}
return -1;
}
public static void main(String[] args) {
int[] data = {5, 10, 15, 20};
int idx = findIndex(data, 15);
System.out.println(idx);
}
}
What is the output?
Exhibit
Refer to the exhibit.
public class Search {
public static int findIndex(int[] arr, int value) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] == value) {
return i;
}
}
return -1;
}
public static void main(String[] args) {
int[] data = {5, 10, 15, 20};
int idx = findIndex(data, 15);
System.out.println(idx);
}
}
A
2
Why wrong: Incorrect: 2 is the value searched for, but binarySearch returns the index, not the value.
B
-1
Why wrong: Incorrect: -1 would indicate the key is not found, but 2 is present at index 1.
C
1
Correct: binarySearch returns the index of 2, which is 1.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
1
The code uses Arrays.binarySearch on a sorted array {1, 2, 3, 4, 5} to find the value 2. The method returns the index where the value is found, which is 1 (0-based). Since the code prints the return value of binarySearch directly, the output is 1.
Key principle: binarySearch
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
2
Why it's wrong here
Incorrect: 2 is the value searched for, but binarySearch returns the index, not the value.
✗
-1
Why it's wrong here
Incorrect: -1 would indicate the key is not found, but 2 is present at index 1.
✓
1
Why this is correct
Correct: binarySearch returns the index of 2, which is 1.
Related concept
binarySearch
✗
3
Why it's wrong here
Incorrect: 3 is not the index of 2.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is to confuse the return value of binarySearch with the actual value in the array. binarySearch returns the index of the search key, not the key itself.
Detailed technical explanation
How to think about this question
The binarySearch method in Java's Arrays class requires the array to be sorted; otherwise, results are undefined. It uses a binary search algorithm with O(log n) complexity. In real-world scenarios, this is efficient for large datasets, but developers must ensure the array is sorted before calling binarySearch to avoid incorrect results.
KKey Concepts to Remember
binarySearch
Array indexing
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
binarySearch
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. binarySearch 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 binarySearch, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
Arrays and Methods — This question tests Arrays and Methods — binarySearch.
What is the correct answer to this question?
The correct answer is: 1 — The code uses Arrays.binarySearch on a sorted array {1, 2, 3, 4, 5} to find the value 2. The method returns the index where the value is found, which is 1 (0-based). Since the code prints the return value of binarySearch directly, the output is 1.
What should I do if I get this 1Z0-811 question wrong?
Review binarySearch, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
binarySearch
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Question Discussion
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