帮我写一个关于驾校考试预约管理系统的java代码，至少有以下操作：用户注册登录，用户选择考试地点，用户考试预约，管理员删除用户，管理员修改用户预约时间，查看用户个人信息和预约时间

好的，以下是一个简单的基于Java的驾校考试预约管理系统代码，实现了您所提到的操作：

import java.util.ArrayList;
import java.util.Scanner;

class User {
    String username;
    String password;
    String location;
    String appointment;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
}

class Admin {
    ArrayList<User> users = new ArrayList<>();

    public void deleteUser(String username) {
        for (User user : users) {
            if (user.username.equals(username)) {
                users.remove(user);
                break;
            }
        }
    }

    public void modifyAppointment(String username, String appointment) {
        for (User user : users) {
            if (user.username.equals(username)) {
                user.appointment = appointment;
                break;
            }
        }
    }

    public void viewUserInfo(User user) {
        System.out.println("Username: " + user.username);
        System.out.println("Location: " + user.location);
        System.out.println("Appointment: " + user.appointment);
    }
}

public class DrivingSchoolSystem {
    static Scanner scanner = new Scanner(System.in);
    static Admin admin = new Admin();

    public static void main(String[] args) {
        boolean exit = false;
        while (!exit) {
            System.out.println("1. Register");
            System.out.println("2. Login");
            System.out.println("3. Exit");
            int choice = scanner.nextInt();
            scanner.nextLine(); // consume newline character
            switch (choice) {
                case 1:
                    registerUser();
                    break;
                case 2:
                    loginUser();
                    break;
                case 3:
                    exit = true;
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }

    static void registerUser() {
        System.out.print("Enter username: ");
        String username = scanner.nextLine();
        System.out.print("Enter password: ");
        String password = scanner.nextLine();
        User user = new User(username, password);
        admin.users.add(user);
        System.out.println("User registered successfully.");
    }

    static void loginUser() {
        System.out.print("Enter username: ");
        String username = scanner.nextLine();
        System.out.print("Enter password: ");
        String password = scanner.nextLine();
        User user = null;
        for (User u : admin.users) {
            if (u.username.equals(username) && u.password.equals(password)) {
                user = u;
                break;
            }
        }
        if (user == null) {
            System.out.println("Invalid login credentials!");
            return;
        }
        boolean exit = false;
        while (!exit) {
            System.out.println("1. Choose location");
            System.out.println("2. Make appointment");
            System.out.println("3. View personal information");
            System.out.println("4. Logout");
            int choice = scanner.nextInt();
            scanner.nextLine(); // consume newline character
            switch (choice) {
                case 1:
                    System.out.print("Enter location: ");
                    String location = scanner.nextLine();
                    user.location = location;
                    System.out.println("Location selected successfully.");
                    break;
                case 2:
                    System.out.print("Enter appointment date and time: ");
                    String appointment = scanner.nextLine();
                    user.appointment = appointment;
                    System.out.println("Appointment made successfully.");
                    break;
                case 3:
                    admin.viewUserInfo(user);
                    break;
                case 4:
                    exit = true;
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }
}

请注意，此代码只是一个简单的示例，可能需要进一步优化和改进，以确保安全性和可靠性。