1Z0-829 Working with Arrays and Collections Practice Question
This 1Z0-829 practice question tests your understanding of working with arrays and collections. 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 of the following correctly converts an array of strings to a List?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Arrays.asList(array) returns a fixed-size list backed by the array.
Option C is correct because `Arrays.asList(array)` returns a fixed-size list backed by the original array, meaning changes to the list (like `set`) reflect in the array, but structural modifications (like `add` or `remove`) throw `UnsupportedOperationException`. This is the standard, exam-relevant way to convert an array to a List in Java.
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.
✗
Collections.toList(array) converts the array.
Why it's wrong here
No such method exists in Collections class.
✗
List.of(array) returns a mutable list.
Why it's wrong here
List.of returns an immutable list; any attempt to modify it throws UnsupportedOperationException.
✓
Arrays.asList(array) returns a fixed-size list backed by the array.
Why this is correct
Arrays.asList returns a list view of the array, fixed-size and mutable via set operations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Arrays.asList(array) returns a new ArrayList with a copy of the elements.
Why it's wrong here
It returns a List view, not a new ArrayList; modifications to the list affect the array.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `Arrays.asList()` with creating a fully mutable `ArrayList`, or they think `List.of()` returns a mutable list, but the exam specifically tests the fixed-size, array-backed nature of `Arrays.asList()` versus the immutability of `List.of()`.
Detailed technical explanation
How to think about this question
Under the hood, `Arrays.asList()` returns a private inner class `java.util.Arrays.ArrayList` (not `java.util.ArrayList`), which stores a reference to the original array and overrides `set()` but not `add()` or `remove()`, hence the fixed-size behavior. This is critical in legacy code where you need to pass an array to an API expecting a `List` but must avoid copying overhead. A real-world scenario is when processing command-line arguments (`String[] args`) as a list for iteration without allowing structural changes.
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: Arrays.asList(array) returns a fixed-size list backed by the array. — Option C is correct because `Arrays.asList(array)` returns a fixed-size list backed by the original array, meaning changes to the list (like `set`) reflect in the array, but structural modifications (like `add` or `remove`) throw `UnsupportedOperationException`. This is the standard, exam-relevant way to convert an array to a List in Java.
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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