1Z0-829 Working with Arrays and Collections Practice Question
This 1Z0-829 practice question tests your understanding of working with arrays and collections. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 statements about Arrays.asList() are true? (Select two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It returns a fixed-size list backed by the original array.
Option D is correct because `Arrays.asList()` returns a fixed-size list backed by the original array, meaning the list's size cannot be changed (no add or remove operations allowed). Option E is correct because any modification to the returned list (e.g., setting an element) directly modifies the underlying array, and vice versa, as the list is a view of the array.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
It supports adding and removing elements.
Why it's wrong here
The list is fixed-size; add and remove throw UnsupportedOperationException.
✗
It returns a new ArrayList with a copy of the elements.
Why it's wrong here
It returns a List view, not a new ArrayList.
✗
It can be used to convert an array to a mutable list if wrapped with new ArrayList<>().
Why it's wrong here
This is a common usage, but it is not a property of Arrays.asList itself; the statement is about the method.
✓
It returns a fixed-size list backed by the original array.
Why this is correct
The returned list size is fixed and changes to the list are reflected in the array.
Related concept
Read the scenario before looking for a memorised answer.
✓
Changes to the returned list are reflected in the original array.
Why this is correct
Because it is backed by the array, modifications to the list (like set) change the array.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume `Arrays.asList()` returns a regular `java.util.ArrayList` and therefore supports add/remove, or they forget that the returned list is fixed-size and backed by the original array, leading them to select options A or B.
Detailed technical explanation
How to think about this question
Under the hood, `Arrays.asList()` returns an instance of `java.util.Arrays$ArrayList`, a static nested class that stores the original array reference and delegates `get()`/`set()` directly to it. This is why changes to the list are reflected in the array. A common subtlety is that `Arrays.asList()` works with reference types only; passing a primitive array (e.g., `int[]`) results in a list with a single element of type `int[]`, not a list of integers.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Working with Arrays and Collections — This question tests Working with Arrays and Collections — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It returns a fixed-size list backed by the original array. — Option D is correct because `Arrays.asList()` returns a fixed-size list backed by the original array, meaning the list's size cannot be changed (no add or remove operations allowed). Option E is correct because any modification to the returned list (e.g., setting an element) directly modifies the underlying array, and vice versa, as the list is a view of the array.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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