Question 140 of 481
1Z0-811 Arrays and Methods Practice Question
A method is needed to return a new array where each element is doubled. Which method signature correctly accomplishes this?
⚠ Common exam trap
Oracle often tests the distinction between returning a single value versus an array, and candidates may confuse the return type `int` with `int[]` or forget that the parameter must match the array type to process multiple elements.
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
✓
public int[] doubleArray(int[] input)
The method must return a new array with doubled values, so the return type must be `int[]` (an array of integers) and the parameter must be an `int[]` (the input array). This signature allows the method to accept an array, process each element, and return a new array of the same length with each element doubled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
public int doubleArray(int[] input)
Why it's wrong here
Return type int does not match expected output array.
- ✓
public int[] doubleArray(int[] input)
Why this is correct
Correct return type and parameter.
- ✗
public int[] doubleArray(int input)
Why it's wrong here
Parameter type should be int[] to receive an array.
- ✗
public void doubleArray(int[] input)
Why it's wrong here
Void return type does not return the new array.
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Last reviewed: Jun 30, 2026
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