// Refactoring, a First Example, step7, (~p52)
import java.util.*;
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; // 名稱
private Price _price; // 價格 // <-- changed
public Movie(String title, int priceCode){
_title = title;
setPriceCode(priceCode);
}
public int getPriceCode(){
return _price.getPriceCode(); // <-- changed
}
public void setPriceCode(int arg) { // <-- changed
switch (arg) {
case REGULAR: // 普通片
_price = new RegularPrice();
break;
case CHILDRENS: // 兒童片
_price = new ChildrensPrice();
break;
case NEW_RELEASE: // 新片
_price = new NewReleasePrice();
break;
default:
throw new IllegalArgumentException("Incorrect Price Code");
}
}
public String getTitle(){
return _title;
}
// jjhou add
public static void main(String[] args) {
System.out.println("Refactoring, a First Example, step7");
Movie m1 = new Movie("Seven", Movie.NEW_RELEASE);
Movie m2 = new Movie("Terminator", Movie.REGULAR);
Movie m3 = new Movie("Star Trek", Movie.CHILDRENS);
Rental r1 = new Rental(m1, 4);
Rental r2 = new Rental(m1, 2);
Rental r3 = new Rental(m3, 7);
Rental r4 = new Rental(m2, 5);
Rental r5 = new Rental(m3, 3);
Customer c1 = new Customer("jjhou");
c1.addRental(r1);
c1.addRental(r4);
Customer c2 = new Customer("gigix");
c2.addRental(r1);
c2.addRental(r3);
c2.addRental(r2);
Customer c3 = new Customer("jiangtao");
c3.addRental(r3);
c3.addRental(r5);
Customer c4 = new Customer("yeka");
c4.addRental(r2);
c4.addRental(r3);
c4.addRental(r5);
System.out.println(c1.statement());
System.out.println(c2.statement());
System.out.println(c3.statement());
System.out.println(c4.statement());
}
double getCharge(int daysRented) {
return _price.getCharge(daysRented);
}
int getFrequentRenterPoints(int daysRented) {
return _price.getFrequentRenterPoints(daysRented);
}
}
class Rental {
private Movie _movie; // 影片
private int _daysRented; // 租期
public Rental(Movie movie, int daysRented) {
_movie = movie;
_daysRented = daysRented;
}
public int getDaysRented() {
return _daysRented;
}
public Movie getMovie() {
return _movie;
}
double getCharge() {
return _movie.getCharge(_daysRented);
}
int getFrequentRenterPoints() {
return _movie.getFrequentRenterPoints(_daysRented);
}
}
class Customer {
private String _name; // 姓名
private Vector _rentals = new Vector(); // 租借記錄
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 = "Rental Record for " + getName() + "\n";
while (rentals.hasMoreElements()) {
Rental each = (Rental) rentals.nextElement();
//show figures for this rental
result += "\t" + each.getMovie().getTitle()+ "\t" +
String.valueOf(each.getCharge()) + "\n";
}
//add footer lines（結尾列印）
result += "Amount owed is " +
String.valueOf(getTotalCharge()) + "\n";
result += "You earned " +
String.valueOf(getTotalFrequentRenterPoints()) +
" frequent renter points";
return result;
}
public String htmlStatement() {
Enumeration rentals = _rentals.elements();
String result = "Rentals for " + getName() +
"
\n";
while (rentals.hasMoreElements()) {
Rental each = (Rental) rentals.nextElement();
//show figures for each rental
result += each.getMovie().getTitle()+ ": " +
String.valueOf(each.getCharge()) + "
\n";
}
//add footer lines
result += "
You owe " +
String.valueOf(getTotalCharge()) +
"
\n";
result += "On this rental you earned " +
String.valueOf(getTotalFrequentRenterPoints()) +
" frequent renter points
";
return result;
}
// 譯註：此即所謂query method
private int getTotalFrequentRenterPoints(){
int result = 0;
Enumeration rentals = _rentals.elements();
while (rentals.hasMoreElements()) {
Rental each = (Rental) rentals.nextElement();
result += each.getFrequentRenterPoints();
}
return result;
}
// 譯註：此即所謂query method
private double getTotalCharge() {
double result = 0;
Enumeration rentals = _rentals.elements();
while (rentals.hasMoreElements()) {
Rental each = (Rental) rentals.nextElement();
result += each.getCharge();
}
return result;
}
}
abstract class Price {
abstract int getPriceCode(); // 取得價格代號
abstract double getCharge(int daysRented);
int getFrequentRenterPoints(int daysRented) {
return 1;
}
}
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;
}
}
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;
}
}
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;
}
}
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efile-refactor-chap01.zip 大约有7个文件 
refactor/prog/ch1-p21/Movie.java 3.09KB 
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