Selection Of Invocation Of Overridden Method During Constructor Chaining

I don't understand, why when in the constructor of the superclass A the method init() is called (line 4), the overridden version of the subclass is invoked (line 26) and not the superclass version (line 7):

class A {
public A () {
init();
}
public void init() {
System.out.println("test");

[Code] ....

I would have guessed that above code prints

test
1

But instead you get a NPE (because when the constructor of B is invoked

public static void main(String[] args) {
new B();
}

Then there is first the implicit call to super:

public B() {
s = " ";
init();
}

Which is the constructor of A:

public A () {
init();
}

But here now this init() method is not the version of A ( public void init() {
System.out.println("test");
}) but the overriden version of the subclass (B): public void init() {
System.out.println(s+=s.length());
}...

Which throws an NPE of course, because the initialization of s has not occured yet (it happens only after the implicit call to super() has finished (see public B() {
s = " ";
init();
}))