下列代码运行的结果是：(     )

class Foo {
    public int a; public Foo() { a = 3; }
    public void addFive() { a += 5; }
}
class Bar extends Foo { 
    public int a; public Bar() { a = 8; }
    public void addFive() { this.a += 5; }
}
public class TestFoo {
    public static void main(String[] args) {
        Foo foo = new Bar();
        foo.addFive();
        System.out.println("Value: " + foo.a); 
    }
}