Java Basics and Syntax →easyMultiple ChoiceObjective-mapped

1Z0-811 Java Basics and Syntax Practice Question

Which loop construct guarantees that the loop body executes at least once?

⚠ Common exam trap

Oracle often tests the subtle distinction between pre-test and post-test loops, and the trap here is that candidates confuse the do-while loop with the while loop, assuming both can skip execution, when in fact only the do-while guarantees at least one iteration.

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 Java loop construct that guarantees the loop body executes at least once because the condition is evaluated after the body executes. In contrast, the while and for loops evaluate the condition before the first iteration, so the body may never execute if the condition is initially false. The enhanced for loop also checks for elements before entering the body.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Enhanced for loop
Why it's wrong here
Enhanced for loop iterates over collection; may have zero iterations.
✗
while loop
Why it's wrong here
While loop checks condition first; may not execute.
✗
for loop
Why it's wrong here
For loop checks condition before execution; may not execute at all.
✓
do-while loop
Why this is correct
The do-while executes the body before checking the condition.

Go deeper

1Z0-811 Java Basics and Syntax Practice Question

Why each option matters

Option-by-option breakdown

Related to this question