Question 388 of 481
1Z0-811 Arrays and Methods Practice Question
Which method invocation is ambiguous given these overloaded methods? public void process(int[] a) and public void process(int... a)
⚠ Common exam trap
Many candidates think varargs and array parameters are distinct, but they are not; the compiler treats them as identical when the argument is an array, leading to ambiguity.
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
✓
process(new int[]{1, 2});
When you call process(new int[]{1, 2}), the compiler cannot determine whether to use the method with an int[] parameter or the varargs method (int... a). Both methods have the same signature after type erasure, and the argument is an int array, which matches both exactly, causing an ambiguity error.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
process(1, 2);
Why it's wrong here
Only varargs matches (int...).
- ✗
process((int[]) null);
Why it's wrong here
Explicit cast to int[] resolves to the array version.
- ✗
process();
Why it's wrong here
Only varargs matches (empty arguments).
- ✓
process(new int[]{1, 2});
Why this is correct
Both methods accept an int array, causing ambiguity.
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Last reviewed: Jun 25, 2026
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