// P224.java
// OOP from p 224 of EOPL II

import java.io.*;
import java.util.*;

class A {
  int i;
  int j;
 
  public A() {
    System.out.println("A instance is created");
    initialize();
  }

  void initialize () {
    System.out.println("A is initialized");
  }

  Vector setup() {
    i = 15;
    j = 20;
    Vector v = new Vector();
    v.add(new Integer(50));
    return v;
  }

  Vector f() {
    return this.g();
  }

  Vector g() {
    Vector v = new Vector();
    v.add(new Integer(i + j));
    return v;
  }
}

class B extends A {
  int j;
  int k;

  public B() {
    super();
    System.out.println("B instance is created");
  }

   Vector setup() {
    j = 100;
    k = 200;
    super.setup();
    return this.h();
  }

  Vector g() {
    Vector v = new Vector();
    v.add(new Integer(i));
    v.add(new Integer(j));
    v.add(new Integer(k));
    return v;
  }

  Vector h() {
    return super.g();
  }
}

class C extends B {

  public C() {
    System.out.println("C instance is created");
  }

  Vector g() {
    return super.h();
  }

  Vector h() {
    Vector v = new Vector();
    v.add(new Integer(k + j));
    return v;
  }
}

public class P224 {

  static Vector p(A o) {
    Vector u = o.setup();
    Vector v = o.g();
    Vector w = o.f();
    Vector z = new Vector();
    z.add(u);
    z.add(v);
    z.add(w);
    return z;
  }

  public static void main(String[] args) {
    Vector x = p(new A());
    Vector y = p(new B());
    Vector z = p(new C());
    Vector w = new Vector();
    w.add(x);
    w.add(y);
    w.add(z);
    System.out.println(x);
    System.out.println(y);
    System.out.println(z);
    System.out.println(w);
  }
}

/*

[[50], [35], [35]]

[[35], [15, 100, 200], [15, 100, 200]]

[[300], [35], [35]]

[[[50], [35], [35]], 
 [[35], [15, 100, 200], [15, 100, 200]], 
 [[300], [35], [35]]]

*/