Question

public class Demo {
    public static String doit(int x,int y)
    {
        return"a";
    }
    public static String doit(int ...val)
    {
        return "b";
    }
    public static void main(String args[])
    {
        System.out.println(doit(4,5));
    }
}

I have a doubt that why compilier is not showing any error since doit(4,5) is causing ambiguity

When I ru the code ,I get output as a ad not b why?

Answer 1

The Java Language Specification defines that first method (“a”) should be called (rather than “b”).

See http://docs.oracle.com/javase/specs/jls/se5.0/html/expressions.html#15.12.2

In order to maintain backwards compatibility with previous Java versions (before varargs was introduced), the compiler will always pick a method with the exact number of arguments, even if a varargs method also exists.

As to whether you get a warning or not, compilers are free to add additional warnings, and there may be some that do warn about this situation, I guess yours doesn’t (at least not with the settings you have)