1Z0-811 Control Flow and Loops Practice Question
A developer implements a loop that processes a list of transactions. The loop must ensure that at least one transaction is processed even if the list is empty. Which loop construct guarantees this?
⚠ Common exam trap
The 1Z0-811 exam often tests the distinction between entry-controlled (while, for) and exit-controlled (do-while) loops, trapping candidates who assume all loops can guarantee at least one execution without considering when the condition is evaluated.
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
✓
do-while loop
The do-while loop is the correct choice because it guarantees that the loop body executes at least once, regardless of the condition. In Java, the do-while loop evaluates its boolean condition after executing the loop body, so even if the list is empty (e.g., size 0), the transaction processing code inside the loop will run once before the condition is checked.
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
while loop checks condition first; if list empty, body not executed.
- ✗
enhanced for loop
Why it's wrong here
enhanced for loop iterates over elements; if collection empty, body not executed.
- ✓
do-while loop
Why this is correct
do-while executes body once before checking condition, guaranteeing at least one execution.
- ✗
for loop
Why it's wrong here
for loop checks condition before executing body; if list empty, body not executed.
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