Question 104 of 513
1Z0-829 Working with Arrays and Collections Practice Question
Which statement about Collection interface remove methods is correct?
⚠ Common exam trap
Test-takers frequently confuse the Collection interface's remove(Object) with the List interface's remove(int), mistakenly thinking that remove(Object) removes all occurrences or that the index-based remove is part of the Collection interface.
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
✓
Collection.remove(Object) removes the first occurrence and returns boolean.
The Collection interface's remove(Object) method removes the first occurrence of the specified element from the collection, if present, and returns true if the collection was modified (i.e., the element was found and removed). This behavior is defined in the Java Collections Framework and applies to all implementations of Collection, such as ArrayList and HashSet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Collection.remove(Object) removes the first occurrence and returns boolean.
Why this is correct
Correct behavior for remove method in Collection.
- ✗
List.remove(int) removes element at index and returns the removed element.
Why it's wrong here
This method is in List interface, not Collection.
- ✗
Collection.remove(Object) removes all occurrences of the element.
Why it's wrong here
It removes only the first occurrence and returns true if an element was removed.
- ✗
Both B and C
Why it's wrong here
C is not a method of Collection, so D is incorrect.
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Last reviewed: Jun 25, 2026
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