Java开发小型客户管理系统教程

public class Customer {
    private int id;
    private String name;
    private String phone;
    private String email;
    private String address;

    public Customer(int id, String name, String phone, String email, String address) {
        this.id = id;
        this.name = name;
        this.phone = phone;
        this.email = email;
        this.address = address;
    }

    // getter 和 setter 方法
    public int getId() { return id; }
    public void setId(int id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public String getPhone() { return phone; }
    public void setPhone(String phone) { this.phone = phone; }

    public String getEmail() { return email; }
    public void setEmail(String email) { this.email = email; }

    public String getAddress() { return address; }
    public void setAddress(String address) { this.address = address; }

    @Override
    public String toString() {
        return "ID: " + id + ", 姓名: " + name + ", 电话: " + phone + 
               ", 邮箱: " + email + ", 地址: " + address;
    }
}

import java.util.ArrayList;
import java.util.List;

public class CustomerService {
    private List customers;
    private int nextId = 1;

    public CustomerService() {
        customers = new ArrayList<>();
    }

    public void addCustomer(String name, String phone, String email, String address) {
        Customer customer = new Customer(nextId++, name, phone, email, address);
        customers.add(customer);
        System.out.println("客户添加成功：" + customer);
    }

    public void listCustomers() {
        if (customers.isEmpty()) {
            System.out.println("暂无客户信息。");
        } else {
            for (Customer c : customers) {
                System.out.println(c);
            }
        }
    }

    public Customer findCustomerByName(String name) {
        for (Customer c : customers) {
            if (c.getName().equalsIgnoreCase(name)) {
                return c;
            }
        }
        return null;
    }

    public boolean updateCustomer(int id, String name, String phone, String email, String address) {
        for (Customer c : customers) {
            if (c.getId() == id) {
                c.setName(name);
                c.setPhone(phone);
                c.setEmail(email);
                c.setAddress(address);
                System.out.println("客户信息已更新：" + c);
                return true;
            }
        }
        return false;
    }

    public boolean deleteCustomer(int id) {
        Customer toRemove = null;
        for (Customer c : customers) {
            if (c.getId() == id) {
                toRemove = c;
                break;
            }
        }
        if (toRemove != null) {
            customers.remove(toRemove);
            System.out.println("客户已删除，ID：" + id);
            return true;
        }
        System.out.println("未找到ID为 " + id + " 的客户。");
        return false;
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        CustomerService service = new CustomerService();
        Scanner scanner = new Scanner(System.in);
        boolean running = true;

        System.out.println("=== 小型客户管理系统 ===");

        while (running) {
            System.out.println("\n1. 添加客户");
            System.out.println("2. 查看所有客户");
            System.out.println("3. 查询客户（按姓名）");
            System.out.println("4. 修改客户");
            System.out.println("5. 删除客户");
            System.out.println("6. 退出");
            System.out.print("请选择操作：");

            int choice = scanner.nextInt();
            scanner.nextLine(); // 消费换行符

            switch (choice) {
                case 1:
                    System.out.print("姓名："); String name = scanner.nextLine();
                    System.out.print("电话："); String phone = scanner.nextLine();
                    System.out.print("邮箱："); String email = scanner.nextLine();
                    System.out.print("地址："); String address = scanner.nextLine();
                    service.addCustomer(name, phone, email, address);
                    break;

                case 2:
                    service.listCustomers();
                    break;

                case 3:
                    System.out.print("输入客户姓名：");
                    String searchName = scanner.nextLine();
                    Customer found = service.findCustomerByName(searchName);
                    if (found != null) {
                        System.out.println("找到客户：" + found);
                    } else {
                        System.out.println("未找到该客户。");
                    }
                    break;

                case 4:
                    System.out.print("输入要修改的客户ID：");
                    int id = scanner.nextInt();
                    scanner.nextLine();
                    System.out.print("新姓名："); String n = scanner.nextLine();
                    System.out.print("新电话："); String p = scanner.nextLine();
                    System.out.print("新邮箱："); String e = scanner.nextLine();
                    System.out.print("新地址："); String a = scanner.nextLine();
                    service.updateCustomer(id, n, p, e, a);
                    break;

                case 5:
                    System.out.print("输入要删除的客户ID：");
                    int delId = scanner.nextInt();
                    service.deleteCustomer(delId);
                    break;

                case 6:
                    System.out.println("系统退出。");
                    running = false;
                    break;

                default:
                    System.out.println("无效选择，请重试。");
            }
        }
        scanner.close();
    }
}