The correct answer is the array initialization with literals using double[] temps = {15.5, 16.2, 18.0, 20.1, 23.4, 27.8, 30.0, 29.5, 26.2, 22.0, 18.5, 16.0}; because this syntax directly assigns a fixed set of 12 monthly temperatures in a single, concise statement, with the array size implicitly determined by the number of elements in the initializer list. This approach is the most appropriate when you know all values at compile time and need a fixed-size collection, as it avoids separate declaration and assignment steps. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of array literal syntax versus other initialization methods like using the new keyword with a size, and a common trap is confusing this shorthand with the longer new double[12] followed by manual index assignment. Remember the memory tip: when you have all the data upfront, let the curly braces do the counting for you.
1Z0-811 Arrays and Methods Practice Question
This 1Z0-811 practice question tests your understanding of arrays and methods. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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.
An application requires storing a fixed set of 12 monthly temperatures. Which initialization is most appropriate?
Option C is correct because it initializes a fixed-size array of 12 doubles with the actual monthly temperature values in a single statement, which is the most appropriate for storing a fixed set of 12 values. The array size is implicitly determined by the number of elements in the initializer list, and the syntax is concise and readable for this use case.
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.
✗
ArrayList<Double> temps = new ArrayList<>();
Why it's wrong here
Not an array, and not fixed-size.
✗
double[] temps = new double[12];
Why it's wrong here
Creates array but elements default to 0.0, not the actual temperatures.
Common exam trap: answer the scenario, not the keyword
Oracle often tests the distinction between array declaration with an initializer list versus just allocating an array with default values, and the trap here is that candidates may choose Option B because it specifies the correct size, but overlook that it does not actually store the required temperature data.
Detailed technical explanation
How to think about this question
In Java, an array initializer list (e.g., {15.5, 16.2, ...}) creates an array object on the heap with the specified values, and the length is fixed at creation time. This is more memory-efficient than using an ArrayList, which internally uses a dynamic array that may resize and incurs overhead for object management. For a known, fixed set of primitive values, a simple array is the idiomatic choice in Java, avoiding unnecessary object creation and autoboxing.
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 1Z0-811 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
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.
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: double[] temps = {15.5, 16.2, 18.0, 20.1, 23.4, 27.8, 30.0, 29.5, 26.2, 22.0, 18.5, 16.0}; — Option C is correct because it initializes a fixed-size array of 12 doubles with the actual monthly temperature values in a single statement, which is the most appropriate for storing a fixed set of 12 values. The array size is implicitly determined by the number of elements in the initializer list, and the syntax is concise and readable for this use case.
What should I do if I get this 1Z0-811 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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