modified example

ChildrensPrice.java

class ChildrensPrice extends Price
{
    int getPriceCode()
    {
        return Movie.CHILDRENS;
    }

    double getCharge(int daysRented)
    {
        double result = 1.5;

        if(daysRented > 3)
            result += (daysRented - 3) * 1.5;
        return result;
    }
}

Customer.java

import java.util.Enumeration;
import java.util.Vector;

public class Customer
{
    private String _name;
    private Vector _rentals = new Vector();

    public Customer(String name)
    {
        _name = name;
    }

    public void addRental(Rental arg)
    {
        _rentals.addElement(arg);
    }

    public String getName()
    {
        return _name;
    }

    public String statement()
    {
        Enumeration rentals = _rentals.elements();
        String result = getName() + "고객님의 대여 기록\n";

        while(rentals.hasMoreElements())
        {
            Rental each = (Rental) rentals.nextElement();

            result += "\t" + each.getMovie().getTitle() + "\t" + String.valueOf(each.getCharge()) + "\n";
        }

        result += "누적 대여료: " + String.valueOf(getTotalCharge()) + "\n";
        result += "적립 포인트: " + String.valueOf(getTotalFrequentRenterPoints());

        return result;
    }

    public String htmlStatement()
    {
        Enumeration rentals = _rentals.elements();
        String result = "<h1><em>" + getName() + " 고객님의 대여 기록</em></h1><p>\n";

        while(rentals.hasMoreElements())
        {
            Rental each = (Rental)rentals.nextElement();
            result += each.getMovie().getTitle() + ": " + String.valueOf(each.getCharge()) + "<br>\n";
        }

        result += "<p>누적 대여료 <em>" + String.valueOf(getTotalCharge()) + "</em><p>\n";
        result += "적립 포인트: <em>" + String.valueOf(getTotalFrequentRenterPoints()) + "</em><p>";
        return result;
    }

    private double getTotalCharge()
    {
        double result = 0;
        Enumeration rentals = _rentals.elements();

        while(rentals.hasMoreElements())
        {
            Rental each = (Rental)rentals.nextElement();
            result += each.getCharge();
        }
        return result;
    }

    private int getTotalFrequentRenterPoints()
    {
        int result = 0;
        Enumeration rentals = _rentals.elements();

        while(rentals.hasMoreElements())
        {
            Rental each = (Rental)rentals.nextElement();
            result += each.getFrequentRenterPoints();
        }
        return result;
    }
}

Movie.java

public class Movie
{
    public static final int CHILDRENS = 2;
    public static final int REGULAR = 0;
    public static final int NEW_RELEASE = 1;

    private String _title;
    private Price _priceCode;

    public Movie(String title, int priceCode)
    {
        _title = title;
        setPriceCode(priceCode);
    }

    public int getPriceCode()
    {
        return _priceCode.getPriceCode();
    }

    public void setPriceCode(int arg)
    {
        switch (arg)
        {
            case REGULAR:
                _priceCode = new RegularPrice();
                break;
            case CHILDRENS:
                _priceCode = new ChildrensPrice();
                break;
            case NEW_RELEASE:
                _priceCode = new NewReleasePrice();
                break;
            default:
                throw new IllegalArgumentException("가격 코드가 잘못됐습니다.");
        }
    }

    public String getTitle()
    {
        return _title;
    }

    int getFrequentRenterPoints(int daysRented)
    {
        return _priceCode.getFrequentRenterPoints(daysRented);
    }

    double getCharge(int daysRented)
    {
        return _priceCode.getCharge(daysRented);
    }
}

NewReleasePrice.java

public class NewReleasePrice extends Price
{
    int getPriceCode()
    {
        return Movie.NEW_RELEASE;
    }

    double getCharge(int daysRented)
    {
        return daysRented * 3;
    }

    int getFrequentRenterPoints(int daysRented)
    {
        return (daysRented > 1) ?  2 : 1;
    }
}

Price.java

abstract class Price
{
    abstract int getPriceCode();

    abstract double getCharge(int daysRented);

    int getFrequentRenterPoints(int daysRented)
    {
        return 1;
    }
}

RegularPrice.java

public class RegularPrice extends Price
{
    int getPriceCode()
    {
        return Movie.REGULAR;
    }

    double getCharge(int daysRented)
    {
        double result = 2;

        if(daysRented > 2)
            result += (daysRented - 2) * 1.5;
        return result;
    }
}

Rental.java

public class Rental
{
    private Movie _movie;
    private int _daysRented;

    public Rental(Movie movie, int daysRented)
    {
        _movie = movie;
        _daysRented = daysRented;
    }

    public int getDaysRented()
    {
        return _daysRented;
    }

    public Movie getMovie()
    {
        return _movie;
    }

    int getFrequentRenterPoints()
    {
        return _movie.getFrequentRenterPoints(_daysRented);
    }

    double getCharge()
    {
        return _movie.getCharge(_daysRented);
    }
}