1Z0-829 Controlling Program Flow Practice Question
Which two statements about the enhanced for-each loop in Java are true? (Choose two.)
⚠ Common exam trap
Candidates often think the enhanced for-each loop can safely modify collections because it 'hides' the iterator, but it actually exposes the same fail-fast behavior as explicit iterator usage.
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
✓
It requires the target to implement the Iterable interface, except for arrays.
The enhanced for-each loop requires the target to implement the Iterable interface, except for arrays, which are handled natively by the compiler using index-based iteration. This is specified in the Java Language Specification (JLS §14.14.2), where arrays are a special case that does not require Iterable.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It requires the target to implement the Iterable interface, except for arrays.
Why this is correct
For arrays, the loop works directly; for other objects, they must implement Iterable.
- ✗
It can safely modify the underlying collection during iteration.
Why it's wrong here
Modifying a collection during for-each iteration usually throws ConcurrentModificationException.
- ✗
It can be used to iterate directly over a Stream object.
Why it's wrong here
Stream does not implement Iterable; you need to use Stream's forEach method or collect into a collection.
- ✓
It can be used to iterate over an array.
Why this is correct
The for-each loop works with arrays and collections.
- ✗
It provides an implicit counter variable that can be accessed.
Why it's wrong here
No counter is available; you must use a traditional for loop to track indices.
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