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1
6
7 import java.util.*;
8
9 class Javazon {
10
11 public void trade() {
12 System.out.println("Welcome to www.javazon.com");
13
14 Customer c1 = new Customer("c1");
16 Customer c2 = new Customer("c2");
17
18 Shop.javazon.add("p1", 10);
19 Shop.javazon.add("p2", 20);
20
21 for (int i = 0; i < 6; i++) {
22 c1.searchAll();
23 c1.searchByPrice(10);
24 c1.buy();
25 c2.searchAll();
26 c2.searchByName("p");
27 c2.buy();
28 c2.checkout();
29 c1.searchAll();
30 c1.searchByPrice(10);
31 c1.buy();
32 c1.checkout();
33
34 Shop.javazon.processOrders();
35 }
36 }
37 }
38
39 class Product implements Cloneable  {
40
41 String name;
42 float price;
43
44 Product(String name, float price) {
45 this.name = name;
46 this.price = price;
47 }
48 public String toString() {
49 return this.name + " costs " + this.price + " euros";
50 }
51 }
52
53 public class Customer {
54
55 String name;
56 Set search;
57 ShoppingCart shoppingCart;
58
59 public Customer(String name) {
60 this.name = name;
61 this.shoppingCart = new ShoppingCart();
62 }
63 void searchAll() {
64 this.search = Shop.javazon.searchAll();
65 }
66 void searchByName(String subName) {
67 this.search = Shop.javazon.searchByName(this.search, subName);
68 }
69 void searchByPrice(float maxPrice) {
70 this.search = Shop.javazon.searchByPrice(this.search, maxPrice);
71 }
72 void buy() {
73 this.shoppingCart.add(this.search);
74 }
75 public void checkout() {
76 Shop.javazon.bill(this);
77 }
78 public String toString() {
79 return this.name;
80 }
81 }
82
83 class Shop {
84
85 static Shop javazon = new Shop();
86
87 Set products;
88 Vector orders;
89
90 Shop() {
91 this.products = new HashSet();
92 this.orders = new Vector();
93 }
94 Shop add(String name, float price) {
95 this.products.add(new Product(name, price));
96 return this;
97 }
98 Set searchAll() {
99 return new HashSet(this.products);
100 }
101 Set searchByName(Set previousSearch, String subName) {
102 Set result = new HashSet();
103 for (Iterator i = previousSearch.iterator(); i.hasNext(); ) {
104 Product p = (Product)(i.next());
105 if (p.name.indexOf(subName) != -1) {
106 result.add(p);
107 }
108 }
109 return result;
110 }
111 Set searchByPrice(Set previousSearch, float maxPrice) {
112 Set result = new HashSet();
113 for (Iterator i = previousSearch.iterator(); i.hasNext(); ) {
114 Product p = (Product)(i.next());
115 if (p.price <= maxPrice) {
116 result.add(p);
117 }
118 }
119 return result;
120 }
121 void bill(Customer customer) {
122 this.orders.add(new Order(customer, customer.shoppingCart.products));
123 customer.shoppingCart.products = new Vector();
124 }
125 public void processOrders() {
126 for (Iterator i = this.orders.iterator(); i.hasNext(); ) {
127 ((Order)(i.next())).ship();
128 i.remove();
129 }
130 }
131 }
132
133 class ShoppingCart {
134
135 Vector products;
136
137 ShoppingCart() {
138 this.products = new Vector();
139 }
140 void add(Set products) {
141 for (Iterator i = products.iterator(); i.hasNext(); ) {
142 this.products.add(i.next());
143 }
144 }
145 float total() {
146 float total = 0;
147 for (Iterator i = products.iterator(); i.hasNext();) {
148 Product p = (Product)(i.next());
149 total += p.price;
150 }
151 return total;
152 }
153 }
154
155 class Order {
156
157 Customer customer;
158 Vector products;
159
160 Order(Customer customer, Vector products) {
161 this.customer = customer;
162 this.products = products;
163 }
164 float total() {
165 float total = 0;
166 for (Iterator i = this.products.iterator(); i.hasNext();) {
167 Product p = (Product)(i.next());
168 total += p.price;
169 }
170 return total;
171 }
172 public void ship() {
173 String message = "shipping ";
174 for (Iterator i = this.products.iterator(); i.hasNext(); ) {
175 message += i.next() + " ";
176 }
177 message += " to " + this.customer;
178 System.out.println(message);
179 }
180 }
181
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Java API By Example, From Geeks To Geeks.