在Java面向对象编程中，我们可以构建一个电子商务系统来模拟在线购物的过程。这个系统通常包括以下几个关键部分：
1. 用户类 (User)：包含用户的基本信息，如用户名、密码、邮箱等。
2. 商品类 (Product)：包含商品的详细信息，如商品名称、价格、描述、库存等。
3. 购物车类 (ShoppingCart)：用于管理用户添加到购物车的商品和数量。
4. 订单类 (Order)：表示用户提交的购买订单，包括商品列表、总价、收货地址等。
5. 电子商务系统类 (ECommerceSystem)：用于管理用户、商品、购物车和订单，提供注册、登录、浏览商品、添加到购物车、提交订单等功能。
下面是这个电子商务系统的具体实现：
1. 用户类 (User)
java复制代码
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public class User { |
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private String username; |
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private String password; |
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private String email; |
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public User(String username, String password, String email) { |
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this.username = username; |
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this.password = password; |
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this.email = email; |
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} |
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// Getters and Setters |
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public String getUsername() { |
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return username; |
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} |
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public void setUsername(String username) { |
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this.username = username; |
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} |
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public String getPassword() { |
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return password; |
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} |
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public void setPassword(String password) { |
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this.password = password; |
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} |
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public String getEmail() { |
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return email; |
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} |
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public void setEmail(String email) { |
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this.email = email; |
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} |
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// toString method |
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@Override |
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public String toString() { |
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return "User{" + |
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"username='" + username + '\'' + |
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", email='" + email + '\'' + |
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'}'; |
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} |
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} |
2. 商品类 (Product)
java复制代码
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public class Product { |
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private String name; |
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private double price; |
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private String description; |
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private int stock; |
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public Product(String name, double price, String description, int stock) { |
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this.name = name; |
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this.price = price; |
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this.description = description; |
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this.stock = stock; |
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} |
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// Getters and Setters |
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public String getName() { |
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return name; |
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} |
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public void setName(String name) { |
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this.name = name; |
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} |
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public double getPrice() { |
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return price; |
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} |
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public void setPrice(double price) { |
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this.price = price; |
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} |
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public String getDescription() { |
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return description; |
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} |
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public void setDescription(String description) { |
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this.description = description; |
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} |
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public int getStock() { |
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return stock; |
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} |
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public void setStock(int stock) { |
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this.stock = stock; |
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} |
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// toString method |
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@Override |
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public String toString() { |
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return "Product{" + |
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"name='" + name + '\'' + |
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", price=" + price + |
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", description='" + description + '\'' + |
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", stock=" + stock + |
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'}'; |
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} |
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} |
3. 购物车类 (ShoppingCart)
java复制代码
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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public class ShoppingCart { |
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private Map<Product, Integer> items; // 商品和数量的映射 |
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public ShoppingCart() { |
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items = new HashMap<>(); |
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} |
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public void addItem(Product product, int quantity) { |
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if (items.containsKey(product)) { |
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int currentQuantity = items.get(product); |
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items.put(product, currentQuantity + quantity); |
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} else { |
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items.put(product, quantity); |
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} |
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} |
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public void removeItem(Product product, int quantity) { |
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if (items.containsKey(product)) { |
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int currentQuantity = items.get(product); |
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if (currentQuantity >= quantity) { |
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items.put(product, currentQuantity - quantity); |
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} else { |
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items.remove(product); |
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} |
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} |
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} |
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public double getTotalPrice() { |
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double |
