Isn't ambiguity error?

Question

public static void main(String[] a){
          VarArgs obj = new VarArgs();
          obj.add(1,2);
}

class VarArgs{
       int add(int size, Integer... params){
       }
}

This code works. But I thought it will give ambiguity error. Because of type casting.

How does it work?

`2` gets autoboxed to an `Integer` object. – Arnaud May 26 '16 at 15:35 — Arnaud, May 26 '16 at 15:35

score 6 · Accepted Answer · edited May 23 '17 at 12:22

6

The reference to call ambiguous error happens when there are two methods that are equally applicable; and in fact, one common way to fix that error is to remove one of the two methods. (See Compiler error : reference to call ambiguous.)

In your case, there's only one method to begin with, so there's no ambiguity: the 2 simply gets autoboxed into Integer.valueOf(2), then into new Integer[] { Integer.valueOf(2) }.

edited May 23 '17 at 12:22

Community

1
1

answered May 26 '16 at 15:35

ruakh

175,680
26
273
307

Thanks. Other scenario --> If signature is `add(Integer... params, int size)` , then I will get ambiguity. Am I right? – Gibbs May 26 '16 at 15:44
2

@GopsAB That won't compile, because an ellipses parameter must the the last parameter. – Jorn Vernee May 26 '16 at 15:46
@JornVernee Thanks – Gibbs May 26 '16 at 16:04

Isn't ambiguity error?

1 Answers1