Quick Answer
The answer is for (int num : numbers), which is the correct enhanced for loop declaration for array iteration. This syntax is technically known as the for-each loop in Java, and it works by automatically extracting each element from the array in sequence, assigning it to the variable 'num' on every pass, without requiring an index counter or manual bounds checking. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of safe, concise iteration patterns; a common trap is confusing the enhanced for loop with the traditional indexed for loop, where developers mistakenly try to use an index variable like 'i' inside a for-each structure. A reliable memory tip is to think of the colon as meaning "in" — read it aloud as "for each int num in numbers" — which reinforces that the loop handles one element at a time from the collection or array.
This 1Z0-811 practice question tests your understanding of java basics and syntax. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer wants to iterate over an array of integers named 'numbers'. Which loop declaration will correctly access each element?
for (int num : numbers)
Correct enhanced for loop syntax.
for (int num = 0; num < numbers.length; num++)
Why wrong: This is a traditional for loop, not an enhanced for loop.
for (int num in numbers)
Why wrong: 'in' is not Java syntax; colon is used.
for (int num : numbers.length)
Why wrong: numbers.length is an int, not an array.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
for (int num : numbers)
Option A is correct because it uses the enhanced for-each loop syntax, which is designed specifically for iterating over arrays and collections in Java. The colon (:) separates the element variable declaration from the array name, and each iteration assigns the next element to 'num' automatically, without needing an index or explicit bounds checking.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
for (int num : numbers)
Why this is correct
Correct enhanced for loop syntax.
Related concept
Read the scenario before looking for a memorised answer.
for (int num = 0; num < numbers.length; num++)
Why it's wrong here
This is a traditional for loop, not an enhanced for loop.
for (int num in numbers)
Why it's wrong here
'in' is not Java syntax; colon is used.
for (int num : numbers.length)
Why it's wrong here
numbers.length is an int, not an array.
Common exam traps
The trap here is that candidates confuse the for-each syntax with other languages (like Python's 'for x in list') and choose Option C, or they mistakenly think Option B accesses elements directly when it only increments a counter.
Detailed technical explanation
Under the hood, the enhanced for-each loop (JLS 14.14.2) compiles to an indexed for loop for arrays, using a local copy of the array reference and a loop counter to avoid off-by-one errors. A subtle behavior is that modifying the loop variable 'num' does not affect the original array elements, which can prevent accidental mutation. In real-world scenarios, this syntax is preferred for read-only iteration because it eliminates index-related bugs and improves code readability.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: for (int num : numbers) — Option A is correct because it uses the enhanced for-each loop syntax, which is designed specifically for iterating over arrays and collections in Java. The colon (:) separates the element variable declaration from the array name, and each iteration assigns the next element to 'num' automatically, without needing an index or explicit bounds checking.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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