Quick Answer
The correct answer is `int[] arr = new int[3];` because it uses the standard array declaration and initialization syntax where the `new` keyword allocates memory for an array object of a specified size, and the variable `arr` is declared as an `int[]` type to hold that reference. This syntax is legal because it separates the declaration of the array variable from the explicit allocation of the array object with a fixed length. On the Oracle Java Foundations 1Z0-811 exam, this question tests your ability to distinguish between valid and invalid array creation patterns, with a common trap being the mistaken belief that you can omit the `new` keyword or specify both a size and an initializer list in the same statement. For example, `int[] arr = new int[3]{1,2,3};` is illegal because you cannot combine a size declaration with an initializer. A reliable memory tip is: "Size or list, not both—choose one when using `new`."
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.
Which TWO of the following are legal ways to declare and initialize an array?
int arr = {1,2,3};
Why wrong: Invalid. Cannot assign array to int variable.
int arr[];
Why wrong: Invalid as initialization. This is only a declaration.
int[] arr = new int[]{1,2,3};
Valid. Array initializer syntax.
int[] arr = new int[3];
Valid. Creates array with default zeros.
int[3] arr;
Why wrong: Invalid syntax. Array size not allowed in declaration.
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[] arr = new int[]{1,2,3};
Option C is correct because it uses the valid syntax `int[] arr = new int[]{1,2,3};` which declares an array variable of type `int[]`, creates a new array object with an initializer list, and assigns it to the variable. This is a legal way to both declare and initialize an array in a single statement, as the array size is inferred from the number of elements in the initializer.
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 arr = {1,2,3};
Why it's wrong here
Invalid. Cannot assign array to int variable.
int arr[];
Why it's wrong here
Invalid as initialization. This is only a declaration.
int[] arr = new int[]{1,2,3};
Why this is correct
Valid. Array initializer syntax.
Related concept
Read the scenario before looking for a memorised answer.
int[] arr = new int[3];
Why this is correct
Valid. Creates array with default zeros.
Related concept
Read the scenario before looking for a memorised answer.
int[3] arr;
Why it's wrong here
Invalid syntax. Array size not allowed in declaration.
Common exam traps
Oracle often tests the distinction between declaration and initialization, and the trap here is that candidates may think `int arr[];` (Option B) is sufficient because it declares an array, but the question explicitly requires both declaration and initialization, making it incomplete.
Detailed technical explanation
In Java, array declarations can place the brackets after the type (`int[] arr`) or after the variable name (`int arr[]`), but the latter is less common and can be confusing. The `new int[]{1,2,3}` syntax is an anonymous array creation expression that does not require a size because it is inferred from the initializer; this is useful when passing an array directly to a method without storing it in a variable. Under the hood, the JVM allocates contiguous memory for the array object on the heap, and the reference variable holds the address of that object.
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: int[] arr = new int[]{1,2,3}; — Option C is correct because it uses the valid syntax `int[] arr = new int[]{1,2,3};` which declares an array variable of type `int[]`, creates a new array object with an initializer list, and assigns it to the variable. This is a legal way to both declare and initialize an array in a single statement, as the array size is inferred from the number of elements in the initializer.
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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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer uses the following array initialization: int[] nums = new int[]{1, 2, 3}; Which of the following is true?
hardWhy C: Option C is correct because the array initialization `int[] nums = new int[]{1, 2, 3};` explicitly creates an array of length 3, containing the elements 1, 2, and 3. The syntax is valid and the array is not initialized with default values; it is initialized with the specified literal values.
Last reviewed: Jun 30, 2026
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