- A
int[][] array = new int[3,4];
Why wrong: Incorrect. Java does not support comma-separated dimensions; it requires separate bracket pairs.
- B
int[] array[] = new int[3][4];
Correct. This uses a mixed declaration style where the array brackets are split between the type and the variable name, which is valid in Java.
- C
int array[][] = new int[3,4];
Why wrong: Incorrect. Like A, this uses a comma, which is not valid Java syntax.
- D
int[][] array = new int[3][4];
Correct. This is the standard syntax for declaring and initializing a two-dimensional array.
Question 313 of 509
1Z0-811 Two-dimensional array declaration Practice Question
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. A key principle to apply: two-dimensional array declaration. 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 code snippet correctly creates a two-dimensional array with 3 rows and 4 columns?
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
✓
int[] array[] = new int[3][4];
Options B and D are both correct. In Java, a two-dimensional array can be declared using either `int[][] array = new int[3][4];` (Option D) or `int[] array[] = new int[3][4];` (Option B). Both syntaxes are valid and create a 3x4 array. Options A and C are incorrect because Java does not use commas to separate dimensions; each dimension must be in its own set of brackets.
Key principle: Two-dimensional array declaration
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
int[][] array = new int[3,4];
Why it's wrong here
Incorrect. Java does not support comma-separated dimensions; it requires separate bracket pairs.
- ✓
int[] array[] = new int[3][4];
Why this is correct
Correct. This uses a mixed declaration style where the array brackets are split between the type and the variable name, which is valid in Java.
Related concept
Two-dimensional array declaration
- ✗
int array[][] = new int[3,4];
Why it's wrong here
Incorrect. Like A, this uses a comma, which is not valid Java syntax.
- ✓
int[][] array = new int[3][4];
Why this is correct
Correct. This is the standard syntax for declaring and initializing a two-dimensional array.
Related concept
Two-dimensional array declaration
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is that many candidates believe only one syntax style (`int[][]` on the left) is correct. However, Java also accepts the mixed style where brackets appear on both the type and variable name. Both B and D are valid, and you should recognize both.
Detailed technical explanation
How to think about this question
In Java, a two-dimensional array is an array of arrays, meaning `int[][] array = new int[3][4];` creates an array of 3 references, each pointing to a 1D array of 4 ints. Memory is allocated contiguously for each row, but the rows themselves are separate objects on the heap. This structure allows jagged arrays (rows of different lengths) if desired, unlike languages like C# where `[3,4]` denotes a rectangular array.
KKey Concepts to Remember
- Two-dimensional array declaration
- Array instantiation
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Two-dimensional array declaration
Real-world example
How this comes up in practice
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. Two-dimensional array declaration Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
Java Basics and Syntax — This question tests Java Basics and Syntax — Two-dimensional array declaration.
What is the correct answer to this question?
The correct answer is: int[] array[] = new int[3][4]; — Options B and D are both correct. In Java, a two-dimensional array can be declared using either `int[][] array = new int[3][4];` (Option D) or `int[] array[] = new int[3][4];` (Option B). Both syntaxes are valid and create a 3x4 array. Options A and C are incorrect because Java does not use commas to separate dimensions; each dimension must be in its own set of brackets.
What should I do if I get this 1Z0-811 question wrong?
Review two-dimensional array declaration, then practise related 1Z0-811 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Two-dimensional array declaration
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Last reviewed: Jun 30, 2026
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