User Management System

Overview

This project provides a simple user management system with functionalities to add, remove, search, and update users. The system consists of a repository for storing user data and a service layer for managing operations.

Project Structure

com.example
│── model
│   ├── Account.java
│   ├── Constants.java
│   ├── Customer.java
│   ├── Employee.java
│   ├── Loan.java
│   ├── Transaction.java
│   ├── User.java
│── repo
│   ├── UserDB.java
│   ├── AccountDB.java
│── services
│   ├── UserManagement.java
│   ├── AccountManagement.java

Components

1. Models

• Account.java: Represents user accounts.
• Constants.java: Stores application-wide constants.
• Customer.java: Defines customer-specific attributes.
• Employee.java: Defines employee-specific attributes.
• Loan.java: Represents loan-related details.
• Transaction.java: Handles user transactions.
• User.java: Defines the User entity with attributes such as userId and isDeleted.

2. Repositories

• UserDB.java: Handles user data storage and provides methods for:

  • Viewing a user (viewUser)
  • Adding a user (addUser)
  • Removing a user (removeUser)
  • Updating a user (updateUser)

• AccountDB.java: Manages account-related data and provides methods for:

  • Viewing an account (viewAccount)
  • Adding an account (addAccount)
  • Removing an account (removeAccount)
  • Updating an account (updateAccount)

3. Services

• UserManagement.java: Provides an interface for user operations, including:

  • Adding a new user (addUser)
  • Removing an existing user (removeUser)
  • Searching for a user (searchUser)
  • Updating user details (updateUser)

• AccountManagement.java: Provides an interface for account operations, including:

  • Adding a new account (addAccount)
  • Removing an existing account (removeAccount)
  • Searching for an account (searchAccount)
  • Updating account details (updateAccount)

Usage

Adding a User

UserDB userDB = new UserDB();
UserManagement userService = new UserManagement(userDB);
User newUser = new User("123", "John Doe");
userService.addUser(newUser);

Searching for a User

User foundUser = userService.searchUser(newUser);
if (foundUser != null) {
    System.out.println("User found: " + foundUser.getUserId());
} else {
    System.out.println("User not found");
}

Removing a User

userService.removeUser(newUser);

Updating a User

User updatedUser = new User("123", "John Smith");
userService.updateUser(updatedUser);

Requirements

• Java 8+

Future Improvements

• Implement persistent storage (e.g., database)
• Add error handling and logging
• Improve efficiency using Map<String, User> instead of List<User>