1Z0-811 Control Flow and Loops Practice Question
A developer is troubleshooting a performance issue in a reporting application. A nested loop iterates over a large dataset: the outer loop processes each row, and the inner loop performs a complex computation on each column. The application is taking longer than expected. Upon reviewing the code, the developer notices that the inner loop's termination condition is recalculated each iteration, which involves a costly method call. Which optimization should the developer implement to improve performance?
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
✓
Move the inner loop's condition calculation outside the outer loop
Moving the condition calculation outside the outer loop (e.g., storing the result of the costly method call in a variable before the inner loop) eliminates redundant calls, improving performance. Option A is incorrect because using a break statement based on a precomputed value would not address the condition recalculation; the break would exit early but the condition is still recalculated each iteration unless moved outside. Option C is incorrect because converting to recursive calls would typically add overhead (stack frames) and is not a performance optimization for this specific issue. Option D is incorrect because simply changing to a while loop does not change the fact that the condition is recalculated each iteration; the costly method call would still be made each time unless the limit is precomputed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use the break statement to exit early based on a precomputed value
Why it's wrong here
Break does not reduce the number of condition calculations; it only exits early.
- ✓
Move the inner loop's condition calculation outside the outer loop
Why this is correct
By storing the result of the costly method in a variable before the inner loop, the method is called only once per outer iteration.
- ✗
Convert the loops to recursive calls
Why it's wrong here
Recursion would likely increase overhead and complexity, not improve performance.
- ✗
Change the inner loop to use a while loop
Why it's wrong here
A while loop still evaluates the condition each iteration; this does not reduce the costly method call.
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