Question 191 of 513
1Z0-829 Working with Arrays and Collections Practice Question
Which two statements are true about the java.util.Comparator and java.lang.Comparable interfaces? (Choose two.)
⚠ Common exam trap
Candidates often confuse the return type of Comparator.compare (int) with a boolean, or mistakenly think Comparable forces an override of equals, when in fact only compareTo is required.
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
✓
Comparator can be used to sort a list in multiple ways.
The Comparator interface allows you to define multiple different comparison strategies (e.g., by name, by age, by salary) for the same class, enabling sorting of a list in multiple ways. Option D is correct because the Comparable interface is used to define a natural ordering of objects (e.g., String's lexicographic order, Integer's numeric order) by implementing the compareTo method.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Comparator's compare method returns a boolean.
Why it's wrong here
False: compare returns an int.
- ✓
Comparator can be used to sort a list in multiple ways.
Why this is correct
True: Multiple Comparators can define different orderings.
- ✗
A class implementing Comparable must override equals().
Why it's wrong here
False: Only compareTo is required; overriding equals is optional.
- ✓
Comparable is used to define a natural ordering of objects.
Why this is correct
True: Comparable defines natural ordering via compareTo.
- ✗
Comparator is in java.lang package.
Why it's wrong here
False: Comparator is in java.util package.
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Last reviewed: Jul 4, 2026
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