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Question 154 of 513
Working with Arrays and CollectionsmediumMultiple ChoiceObjective-mapped

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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Last reviewed: Jun 11, 2026

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