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1Z0-811 Arrays and Methods Practice Question

An application requires storing a fixed set of 12 monthly temperatures. Which initialization is most appropriate?

⚠ Common exam trap

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.

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

✓

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};

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.

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.
✓
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};
Why this is correct
Directly initializes with the needed values.
✗
double temps[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
Why it's wrong here
All zeros, not real values.

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1Z0-811 Arrays and Methods Practice Question

Why each option matters

Option-by-option breakdown

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