WIden, Box, Var-arg order of priority

[Jia Ramharai]

Hello All,
I came across the piece of code below and could not understand the output for line 15:

public class Bertha {

	static String s = "";

	public static void main(String[] args) {

		int x = 4;
		Boolean y = true;
		short[] sa = { 1, 2, 3 };

		doStuff(x, y);

		doStuff(x);

		doStuff(sa, sa);
		
		System.out.println(s);

	}

	static void doStuff(Object o) {
		s += "1";
	}

	static void doStuff(Object... o) {
		s += "2";
	}

	static void doStuff(Integer... i) {
		s += "3";
	}

	static void doStuff(Long L) {
		s += "4";
	}
}

The compiler compiles and outputs 212.
2 - x is boxed to Integer and then widened to Object.
y is widened to Object.
1 - x is boxed to Integer and then widened to Object.
2 - ???

Can someone please explain what happens for the last 2 to be output instead of 3?

Thank you.

[Himai Minh]

sa IS-A Object, but it IS-NOT-A Integer.
An Object IS-NOT Integer.