1Z0-811 Arrays and Methods Practice Question
A developer writes a method that accepts a variable number of int arguments and returns their product. Which method signature correctly implements this?
⚠ Common exam trap
Oracle often tests the requirement that varargs must be the last parameter, and the trap here is that candidates might think `int nums...` is valid or that a regular array parameter qualifies as variable arguments.
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 static int product(int... nums)
The syntax `int... nums` is the proper Java varargs syntax, allowing a method to accept zero or more `int` arguments, which are then treated as an array inside the method. This enables the developer to call `product(2, 3, 4)` or `product()` and compute the product by iterating over the array.
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 static int product(int[] nums)
Why it's wrong here
This is not varargs; it requires an array argument.
- ✗
public static int product(int nums...)
Why it's wrong here
Invalid syntax; ellipsis after type.
- ✓
public static int product(int... nums)
Why this is correct
Varargs correctly declared.
- ✗
public static int product(int... nums, int extra)
Why it's wrong here
Varargs must be the last parameter.
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