1Z0-829 Working with Arrays and Collections Practice Question
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?
⚠ Common exam trap
Many exam-takers 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.
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 `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].
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.
- ✗
[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.
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