Java Puzzler of the day

Foo.java

public class Foo {
    public static class A {
        public int i = 1;
    }

    public static class B extends A {
        public int i = 2;
    }

    public static void main(String[] args) {
        B b = new B();
        A a = b;
        
        // Quiz: what do they print?
        System.out.println(b.i);
        System.out.println(a.i);
    }
}

I have often wondered if Java field dispatching (err lack of it... sorry for the spoiler) was chosen because of performance reasons or for semantic reasons.