1Z0-829 Controlling Program Flow Practice Question
Which loop construct guarantees that the body executes at least once?
⚠ Common exam trap
Many exam-takers confuse the do-while loop with the while loop, mistakenly thinking that a while loop can also guarantee at least one execution if the condition is true, but the key distinction is that only the do-while loop executes the body before checking the condition.
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 only loop construct in Java that guarantees the body executes at least once because the condition is evaluated after the loop body. This post-test loop design ensures that regardless of the initial condition value, the body runs before any check occurs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
for loop
Why it's wrong here
May execute zero times.
- ✗
enhanced for loop
Why it's wrong here
May execute zero times.
- ✗
while loop
Why it's wrong here
May execute zero times.
- ✓
do-while loop
Why this is correct
Condition checked after body.
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