Question 463 of 513
1Z0-829 Working with Arrays and Collections Practice Question
When should LinkedList be preferred over ArrayList?
⚠ Common exam trap
It's easy for candidates to assume LinkedList is always faster for insertions/deletions anywhere, overlooking that random access by index is O(n) and that the overhead of finding the insertion point can make ArrayList more efficient in practice for many use cases.
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
✓
Frequent insertions and deletions at arbitrary positions
LinkedList is preferred over ArrayList when frequent insertions and deletions occur at arbitrary positions because LinkedList uses a doubly-linked list structure, allowing O(1) time for insertions/deletions once the node is located, whereas ArrayList requires shifting elements (O(n)) due to its underlying array. This makes D correct for scenarios with heavy modification in the middle of the list.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Frequent random access by index
Why it's wrong here
LinkedList has O(n) index access.
- ✗
Fast iteration over all elements
Why it's wrong here
Both are O(n), but ArrayList has better locality.
- ✗
Minimal memory overhead
Why it's wrong here
LinkedList has extra node objects.
- ✓
Frequent insertions and deletions at arbitrary positions
Why this is correct
LinkedList has O(1) operations if position known via iterator.
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Last reviewed: Jun 25, 2026
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