Refactor the code using each of the 5 methods described below, and write JUnit t

Question

Refactor the code using each of the 5 methods described below, and write JUnit test cases for each method:

i) Extract Method

ii) Move Method

iii) Replace Temp with query

iv) Replace Type Code with State/Strategy

v)Replace Conditional(switch) with Polymorphism

Source Code:

Movie.java

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

private String _title;
private int _priceCode;
public Movie(String title, int priceCode) {
_title = title;
_priceCode = priceCode;
}
public int getPriceCode() {
return _priceCode;
}

public void setPriceCode(int arg) {
_priceCode = arg;
}

public String getTitle () {
return _title;
}
}

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;
}
}

Customer.java
import java.util.*;
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() {
double totalAmount = 0;
int frequentRenterPoints = 0;
Enumeration rentals = _rentals.elements();
String result = "Rental Record for " + getName() + " ";

while (rentals.hasMoreElements()) {
double thisAmount = 0;
Rental each = (Rental) rentals.nextElement();
//determine amounts for each line
switch (each.getMovie().getPriceCode()) {
case Movie.REGULAR:
thisAmount += 2;
if (each.getDaysRented() > 2)
thisAmount += (each.getDaysRented() - 2) * 1.5;
break;
case Movie.NEW_RELEASE:
thisAmount += each.getDaysRented() * 3;
break;
case Movie.CHILDRENS:
thisAmount += 1.5;
if (each.getDaysRented() > 3)
thisAmount += (each.getDaysRented() - 3) * 1.5;
break;
}

// add frequent renter points
frequentRenterPoints ++;
// add bonus for a two day new release rental
if ((each.getMovie().getPriceCode() == Movie.NEW_RELEASE) &&
each.getDaysRented() > 1) frequentRenterPoints ++;
//show figures for this rental
result += " " + each.getMovie().getTitle()+ " " +
String.valueOf(thisAmount) + " ";
totalAmount += thisAmount;
}

//add footer lines
result += "Amount owed is " + String.valueOf(totalAmount) + " ";
result += "You earned " + String.valueOf(frequentRenterPoints) +
" frequent renter points";
return result;
}
}

Explanation / Answer

i think that III)

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