1 import java.util.*;
2
3 public class Customer {
4 private String _name;
5 private ArrayList _rentals = new ArrayList();
6
7 public Customer(String name) {
8 _name = name;
9 }
10
11 public void addRental(Rental arg) {
12 _rentals.add(arg);
13 }
14
15 public String getName() {
16 return _name;
17 }
18
19 // How many times do we traverse the rentals ArrayList?
20 // Does it matter?
21 public String statement()
22 {
23 Iterator rentals = _rentals.iterator();
24 String result = "Rental Record for " + getName() + "\n";
25 while (rentals.hasNext()) {
26 Rental rental = (Rental) rentals.next();
27 //show figures for this rental
28 result += "\t" + rental.getMovie().getTitle()+ "\t" +
29 rental.getCharge() +
30 "\n";
31 }
32 //add footer lines
33 result += "Amount owed is " + getTotalCharge() + "\n";
34
35 result += "You earned " + getTotalFrequentRenterPoints() +
36 " frequent renter points";
37 return result;
38 }
39
40 private double getTotalCharge()
41 {
42 double result = 0;
43 Iterator rentals = _rentals.iterator();
44 while(rentals.hasNext()) {
45 result += ((Rental) rentals.next()).getCharge();
46 }
47 return result;
48 }
49
50 private int getTotalFrequentRenterPoints()
51 {
52 int result = 0;
53 Iterator rentals = _rentals.iterator();
54 while(rentals.hasNext())
55 result += ((Rental)rentals.next()).getFrequentRenterPoints();
56 return result;
57 }
58
59 private static long stressTest(Customer customer, Rental rental, int numberRentals)
60 {
61 for(int i = 0; i < numberRentals; i++)
62 customer.addRental(rental);
63 long startTime = System.currentTimeMillis();
64 double totalCharge = customer.getTotalCharge();
65 return System.currentTimeMillis() - startTime;
66 }
67
68 public static void main(String argv[])
69 {
70 Customer harry = new Customer("Harry");
71 Movie movie = new Movie("Gone With The Wind", Movie.REGULAR);
72 Rental rental = new Rental(movie, 3);
73 harry.addRental(rental);
74 System.out.println(harry.statement());
75 Customer tom = new Customer("Tom");
76 // Suppose we have 1000000 rentals. How long will it take
77 // to compute the total charge?
78 int numberRentals = 1000000;
79 long timeToCompute = stressTest(tom, rental, 1000000);
80 System.out.println("time elapsed for " + numberRentals +
81 " rentals = " + timeToCompute);
82 }
83 }
84 // Output:
85 // $ java -classpath . Customer
86 //Rental Record for Harry
87 // Gone With The Wind 3.5
88 //Amount owed is 3.5
89 //You earned 1 frequent renter points
90 // time elapsed for 1000000 rentals = 985