下面程序结果为：(     )

class Wrench2 {
    Integer size;
    public static void main(String[] args) {
        Wrench2 w = new Wrench2();
        w.size = 11;
        Wrench2 w2 = go(w, w.size);
        System.out.print(w2.size);
    }
    static Wrench2 go(Wrench2 wr, Integer s) {
        s = 12;
        return wr;
    }
}