下面程序结果为：(     )

class Bird {
    void talk() {
        System.out.print("chirp ");
    }
}
class Parrot2 extends Bird {
    protected void talk() {
        System.out.print("hello ");
    }
    public static void main(String[] args) {
        Bird[] birds = {new Bird(), new Parrot2()};
        for (Bird b : birds)
            b.talk();
    }
}