Quick Answer
The correct call is `int result = sumArray(new int[]{1,2,3});` because it uses the proper syntax for passing an anonymous array to a method in Java. The expression `new int[]{1,2,3}` creates an unnamed int array object directly in the method call, which perfectly matches the `int[]` parameter of the `sumArray` method. On the Oracle Java Foundations 1Z0-811 exam, this tests your understanding of array creation and method invocation without needing a separate variable declaration—a common trap is trying to pass a bare list like `{1,2,3}` without the `new int[]` syntax, which causes a compilation error. Remember that anonymous arrays must always include the `new` keyword and the type, even when the size is implied by the initializer. A helpful memory tip: think of it as "new type, then curly braces"—the array is born and passed in one breath.
This 1Z0-811 practice question tests your understanding of arrays and methods. 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 writes a method that takes an int array and returns the sum of its elements. The method signature is: 'public static int sumArray(int[] arr)'. Which statement correctly calls this method?
int result = sumArray(new int[]{1,2,3});
Creates and passes an anonymous int array.
int result = sumArray(true);
Why wrong: Passes a boolean, not an array.
int result = sumArray([1,2,3]);
Why wrong: Invalid syntax; use new int[]{...}.
int result = sumArray(5);
Why wrong: Passes 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
int result = sumArray(new int[]{1,2,3});
Option A is correct because it uses the correct syntax for creating and passing an anonymous int array to the sumArray method. The expression `new int[]{1,2,3}` creates an int array object with the specified elements, which matches the method's parameter type `int[]`. The method then returns the sum, which is assigned to the int variable `result`.
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.
int result = sumArray(new int[]{1,2,3});
Why this is correct
Creates and passes an anonymous int array.
Related concept
Read the scenario before looking for a memorised answer.
int result = sumArray(true);
Why it's wrong here
Passes a boolean, not an array.
int result = sumArray([1,2,3]);
Why it's wrong here
Invalid syntax; use new int[]{...}.
int result = sumArray(5);
Why it's wrong here
Passes an int, not an array.
Common exam traps
Oracle often tests the distinction between array initializer syntax (valid only in declarations) and anonymous array syntax (required when passing an array directly to a method), causing candidates to mistakenly use `[1,2,3]` or a single value instead of the proper `new int[]{...}` form.
Detailed technical explanation
In Java, array creation can be done using anonymous array syntax (`new int[]{...}`) when passing directly to a method, as opposed to array initializer syntax (`{...}`) which is only allowed in variable declarations. The method `sumArray` iterates over the array elements using a loop or enhanced for-loop, summing them into an accumulator variable. Understanding array initialization syntax is critical because Java does not support array literals like some other languages (e.g., Python's `[1,2,3]`).
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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FAQ
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
The correct answer is: int result = sumArray(new int[]{1,2,3}); — Option A is correct because it uses the correct syntax for creating and passing an anonymous int array to the sumArray method. The expression `new int[]{1,2,3}` creates an int array object with the specified elements, which matches the method's parameter type `int[]`. The method then returns the sum, which is assigned to the int variable `result`.
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 30, 2026
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
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