Quick Answer
The answer is `int[] newArr = Arrays.copyOf(arr, 5);`. This is correct because `Arrays.copyOf` is a utility method that creates a brand-new array of the specified length—here, 5—and copies the original array’s elements into it, filling any remaining positions with the default value for the data type (0 for `int`). On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of the `java.util.Arrays` class and its `copyOf` method, which is the standard way to resize an array while preserving its original contents. A common trap is confusing `copyOf` with `clone()` or manual loops, but `copyOf` handles both the copy and the length adjustment in one call, leaving the original array untouched. Memory tip: think of `copyOf` as “copy and pad”—it copies what fits and pads the rest with zeros.
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.
Given int[] arr = {1,2,3}; which correctly creates a new array with length 5 and copies the contents of arr?
int[] newArr = new int[5]; newArr = arr;
Why wrong: Assignment makes newArr refer to arr, not a copy.
int[] newArr = arr.clone(); newArr.length = 5;
Why wrong: clone() creates an exact copy; cannot change length afterward.
int[] newArr = Arrays.copy(arr, 5);
Why wrong: Correct method is copyOf, not copy.
int[] newArr = Arrays.copyOf(arr, 5);
Arrays.copyOf creates a new array with specified length and copies elements.
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[] newArr = Arrays.copyOf(arr, 5);
Option D is correct because `Arrays.copyOf(int[] original, int newLength)` creates a new array of the specified length (5) and copies the elements from the original array into it, padding with default values (0 for int) for any extra positions. This method is specifically designed for this task, ensuring the original array remains unchanged.
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[] newArr = new int[5]; newArr = arr;
Why it's wrong here
Assignment makes newArr refer to arr, not a copy.
int[] newArr = arr.clone(); newArr.length = 5;
Why it's wrong here
clone() creates an exact copy; cannot change length afterward.
int[] newArr = Arrays.copy(arr, 5);
Why it's wrong here
Correct method is copyOf, not copy.
int[] newArr = Arrays.copyOf(arr, 5);
Why this is correct
Arrays.copyOf creates a new array with specified length and copies elements.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse reference assignment (`=`) with array copying, or they misremember the exact method name (`Arrays.copy` vs `Arrays.copyOf`), leading them to pick options that either fail to copy or do not compile.
Detailed technical explanation
Under the hood, `Arrays.copyOf` uses `System.arraycopy` (a native method) to efficiently copy the elements, then returns a new array object with the specified length. If the new length is greater than the original, the extra elements are initialized to the default value for the type (e.g., 0 for int, null for objects). This method is commonly used in dynamic data structures like `ArrayList` when resizing the internal array, ensuring thread-safe copying without exposing the original array reference.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Java Basics and Syntax — study guide chapter
Learn the concepts, then practise the questions
Java Basics and Syntax practice questions
Targeted practice on this topic area only
All 1Z0-811 questions
509 questions across all exam domains
Oracle Java Foundations 1Z0-811 study guide
Full concept coverage aligned to exam objectives
1Z0-811 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise 1Z0-811 questions linked to What is Java.
Practise 1Z0-811 questions linked to Java Basics and Syntax.
Practise 1Z0-811 questions linked to Primitives, Strings and Operators.
Practise 1Z0-811 questions linked to Control Flow and Loops.
Practise 1Z0-811 questions linked to Arrays and Methods.
Practise 1Z0-811 questions linked to Object-Oriented Programming.
Practise 1Z0-811 questions linked to Exception Handling and Development Tools.
Practise 1Z0-811 questions linked to 1Z0-811 fundamentals.
Practise 1Z0-811 questions linked to 1Z0-811 scenario.
Practise 1Z0-811 questions linked to 1Z0-811 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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[] newArr = Arrays.copyOf(arr, 5); — Option D is correct because `Arrays.copyOf(int[] original, int newLength)` creates a new array of the specified length (5) and copies the elements from the original array into it, padding with default values (0 for int) for any extra positions. This method is specifically designed for this task, ensuring the original array remains unchanged.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
Last reviewed: Jun 25, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.