Overloading problem

[Jacob Sonia]

Hi, Can anybody explain the reason of ambiguity here.

 

public class OverloadingVarargs2{
	static void f(float i, Character... args){
		System.out.println("first");
	}
	static void f(Character... args){
		System.out.println("second");
	}
	public static void main(String[] args){
	f(1, 'a');
	f('a',  'b');
	}
}   

[Ankit Garg]

Hint: char can be automatically upcasted to float...

[Prithvi Sehgal]

   
 static void f(float i, Character... args){  
        System.out.println("first");  
    }  
    static void f(Character... args){  
        System.out.println("second");  
    }  

First thing i suppose that var-args are the last choice made by the compiler. In your case, if your see there is already a more specific method
present that is number 1 which takes a float. Now when you try to invoke the method calls from your main method, in your second call, as Ankit
told character is automatically up-casted to float then the compiler gets confused, which method to call as there is already a more specific method
present. Thats why it gives the ambiguity error. Hope this helps.

[Jacob Sonia]

So you mean character can be automatically casted to int, float etc

[Ankit Garg]

Jacob Sonia wrote:So you mean character can be automatically casted to int, float etc

Yes