1Z0-819 Question #171: Real Exam Question with Answer & Explanation

Given:

package test.t1;

public class A {
 public int x = 42;
 protected A() { }
}

package test.t2;

import test.t1.*;

public class B extends A {
 int x = 17;
 public B() { super(); }
}

package test;

import test.t1.*;

public class Tester {
 public static void main(String[] args) {
 A obj = new B(); // line 4
 System.out.println(obj.x); // line 5
 }
}

What is the result?