Passing directly an array initializer to a method parameter doesn't work

Question

package arraypkg;

import java.util.Arrays;

public class Main
{
    private static void foo(Object o[])
    {
        System.out.printf(\"%s\", Arrays.toString(o));         


        

Answer 1

foo({1,2}); doesn't tell what type of array it is. So, compiler fails to understand the syntax. All other declarations specify type of array.