java用户管理系统代码

以下是一个简单的Java用户管理系统代码示例，其中包括添加、删除、编辑和查找用户的功能：

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

public class UserManagementSystem {
    private ArrayList<User> userList;

    public UserManagementSystem() {
        userList = new ArrayList<User>();
    }

    public void addUser(User user) {
        userList.add(user);
        System.out.println("User added successfully.");
    }

    public void removeUser(int userId) {
        for (User user : userList) {
            if (user.getUserId() == userId) {
                userList.remove(user);
                System.out.println("User removed successfully.");
                return;
            }
        }
        System.out.println("User not found.");
    }

    public void editUser(int userId, String newName, int newAge, String newEmail) {
        for (User user : userList) {
            if (user.getUserId() == userId) {
                user.setName(newName);
                user.setAge(newAge);
                user.setEmail(newEmail);
                System.out.println("User edited successfully.");
                return;
            }
        }
        System.out.println("User not found.");
    }

    public void searchUser(int userId) {
        for (User user : userList) {
            if (user.getUserId() == userId) {
                System.out.println(user);
                return;
            }
        }
        System.out.println("User not found.");
    }

    public void showAllUsers() {
        for (User user : userList) {
            System.out.println(user);
        }
    }

    public static void main(String[] args) {
        UserManagementSystem ums = new UserManagementSystem();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("Enter 1 to add user.");
            System.out.println("Enter 2 to remove user.");
            System.out.println("Enter 3 to edit user.");
            System.out.println("Enter 4 to search user.");
            System.out.println("Enter 5 to show all users.");
            System.out.println("Enter 0 to exit.");

            int choice = scanner.nextInt();

            if (choice == 0) {
                break;
            }

            switch (choice) {
                case 1:
                    System.out.println("Enter user ID:");
                    int userId = scanner.nextInt();
                    System.out.println("Enter name:");
                    String name = scanner.next();
                    System.out.println("Enter age:");
                    int age = scanner.nextInt();
                    System.out.println("Enter email:");
                    String email = scanner.next();
                    User newUser = new User(userId, name, age, email);
                    ums.addUser(newUser);
                    break;
                case 2:
                    System.out.println("Enter user ID:");
                    int removeUserId = scanner.nextInt();
                    ums.removeUser(removeUserId);
                    break;
                case 3:
                    System.out.println("Enter user ID:");
                    int editUserId = scanner.nextInt();
                    System.out.println("Enter new name:");
                    String newName = scanner.next();
                    System.out.println("Enter new age:");
                    int newAge = scanner.nextInt();
                    System.out.println("Enter new email:");
                    String newEmail = scanner.next();
                    ums.editUser(editUserId, newName, newAge, newEmail);
                    break;
                case 4:
                    System.out.println("Enter user ID:");
                    int searchUserId = scanner.nextInt();
                    ums.searchUser(searchUserId);
                    break;
                case 5:
                    ums.showAllUsers();
                    break;
                default:
                    System.out.println("Invalid choice.");
                    break;
            }
        }

        scanner.close();
    }
}

此代码使用一个`User`类来表示用户，包括用户ID、名称、年龄和电子邮件地址。`UserManagementSystem`类包含添加、删除、编辑和查找用户的方法，以及显示所有用户的方法。在`main`方法中，使用`Scanner`类与用户交互，接收用户选择并调用相应的方法。