public class Shadowing {
  public static void main(String[] args) {
    A a = new B();
    a.test4();
  }
}

class A {
  public int x;
  public A() { test1(); test2(); test3(); }
  private void test1() { System.out.println(x); }
  public void test2() { System.out.println(x); }
  public void test3() { System.out.println(x); }
  public static void test4() { System.out.println("Hi"); }
}

class B extends A {
  public boolean x = true;
  private void test1() { System.out.println(x); } 
  public void test3() { System.out.println(x); }
  public static void test4() { System.out.println("Bye!"); }
}