1Z0-811 Control Flow and Loops Practice Question
A developer needs to iterate over an array of integers and compute the sum of its elements. Which loop construct is most appropriate for this task?
⚠ Common exam trap
Oracle often tests the misconception that a while or do-while loop is always required for array iteration, leading candidates to overlook the enhanced for loop's suitability for simple, index-free traversal tasks like summation.
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
✓
Enhanced for loop
The enhanced for loop (for-each) is the most appropriate construct for iterating over an array of integers to compute a sum because it provides a concise, read-only traversal without needing an explicit index or iterator. It directly accesses each element in sequence, reducing boilerplate and the risk of off-by-one errors, which is ideal for aggregation operations like summation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
while loop
Why it's wrong here
Requires manual index incrementation, more error-prone.
- ✓
Enhanced for loop
Why this is correct
Simplest and clearest for iterating over all elements.
- ✗
switch statement
Why it's wrong here
Switch is for conditional branching, not iteration.
- ✗
do-while loop
Why it's wrong here
Not designed for simple iteration; need index.
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