- A
[A, C, B]
Correct insertion order.
- B
[A, B, C]
Why wrong: Incorrect; C is inserted at index 1.
- C
[A, B]
Why wrong: Incorrect; element C is added.
- D
[C, A, B]
Why wrong: Incorrect; C is not at index 0.
Question 154 of 519
1Z0-829 Working with Arrays and Collections Practice Question
This 1Z0-829 practice question tests your understanding of working with arrays and collections. 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.
A developer writes: List<String> list = new ArrayList<>(); list.add("A"); list.add("B"); list.add(1, "C"); System.out.println(list); What is the output?
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
✓
[A, C, B]
The correct answer is A because the `add(int index, E element)` method inserts the element at the specified index, shifting subsequent elements to the right. Initially, the list is [A, B]. After `list.add(1, "C")`, "C" is inserted at index 1, moving "B" to index 2, resulting in [A, C, B].
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.
- ✓
[A, C, B]
Why this is correct
Correct insertion order.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
[A, B, C]
Why it's wrong here
Incorrect; C is inserted at index 1.
- ✗
[A, B]
Why it's wrong here
Incorrect; element C is added.
- ✗
[C, A, B]
Why it's wrong here
Incorrect; C is not at index 0.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the `add(E element)` method (which appends at the end) with the `add(int index, E element)` method (which inserts at a specific index), leading them to mistakenly think "C" is appended or placed at the beginning.
Detailed technical explanation
How to think about this question
The `ArrayList.add(int index, E element)` operation has O(n) time complexity because it shifts all elements from the specified index onward to the right by one position. This is implemented by calling `System.arraycopy()` internally to move the underlying array elements. In real-world scenarios, frequent insertions at arbitrary positions can degrade performance, making `LinkedList` a better choice for such patterns.
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 1Z0-829 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
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
Working with Arrays and Collections — This question tests Working with Arrays and Collections — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: [A, C, B] — The correct answer is A because the `add(int index, E element)` method inserts the element at the specified index, shifting subsequent elements to the right. Initially, the list is [A, B]. After `list.add(1, "C")`, "C" is inserted at index 1, moving "B" to index 2, resulting in [A, C, B].
What should I do if I get this 1Z0-829 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.
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Last reviewed: Jun 11, 2026
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