Question 419 of 513
1Z0-829 Working with Arrays and Collections Practice Question
Which Map implementation guarantees that keys are sorted in their natural order?
⚠ Common exam trap
A common mix-up: candidates confuse insertion order (LinkedHashMap) with sorted order (TreeMap), or assume HashMap maintains some predictable order, when in fact only TreeMap guarantees sorted keys.
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
✓
TreeMap
TreeMap implements the SortedMap interface, which ensures that keys are stored in their natural ordering (as defined by Comparable) or by a provided Comparator. This makes TreeMap the only standard Map implementation that guarantees sorted keys without external sorting.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
TreeMap
Why this is correct
TreeMap implements NavigableMap, which sorts keys by their natural order or a provided Comparator.
- ✗
Hashtable
Why it's wrong here
Hashtable is synchronized and legacy; it does not guarantee order.
- ✗
LinkedHashMap
Why it's wrong here
LinkedHashMap maintains insertion order (or access order), not natural ordering.
- ✗
HashMap
Why it's wrong here
HashMap does not guarantee any order of keys.
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Last reviewed: Jun 25, 2026
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