Concept of varargs and ambiguity?

Question

Here's an example: ``` package com.demo; public class PassArray { static void vaTest(int... v){ System.out.println("no of args : "+v.length+"contents: "); for (int x:v){ System.out.println(x+" "); } } static void vaTest(boolean... v){ System.out.println("no of args : "+v.length+"contents: "); for (boolean x:v){ System.out.println(x+" "); } } public static void main(String args[]){ vaTest(1,2,3); vaTest(true,false,true); vaTest();//Error:Ambiguous! } } ``` Can anyone tell me : I have some Question 1.Why ambiguous error occure ? 2.i have one Varargs parameter just like ``` int doIt(int a,int b,int c,int... vals) ``` Why varargs must be declared last ? - What is varargs and ambiguity ?

Accepted Answer

Since there are two legal method invocations to the call `vaTest();`, the compiler can't figure out which one to use. To help it out, you can provide an empty array of the chosen type:

```
vaTest(new int[] {});
```

More info is available in the JLS 15.12.2.5. Choosing the Most Specific Method.

Concept of varargs and ambiguity?

Solution

Problem