Task Manager (Console Application)

A simple console-based Task Manager built in Java.
It allows adding, listing, completing, and deleting tasks, with automatic file-based persistence.

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Features

• ADD – Add a new task (incomplete by default)
• LST – List all tasks
• DONE – Mark a task as completed
• DEL – Delete a task by ID
• HELP – Show all available commands
• SAVE – Manually save tasks to file (optional)
• EXIT – Save and exit the application

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Storage Format

Tasks are stored in the file tasks.dat in a simple text-based format:

[ ] id: 1 - Buy milk  
[x] id: 2 - Study sockets  

• [ ] → incomplete
• [x] → completed

Each task has a unique ID, automatically generated and managed in memory by the repository.
The file is recreated on each save to ensure consistency between runs.

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How to Run

1. Clone the repository:

   git clone https://github.com/Kvilarinho/taskmanager.git
   cd taskmanager

2. Build with Maven:

   mvn clean package

3. Run the application:

   java -jar target/taskmanager-1.1-jar-with-dependencies.jar  

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Example Session

Enter a command:
ADD Buy milk
Task added successfully with ID: 1

ADD Study sockets
Task added successfully with ID: 2

LST
[ ] id: 1 - Buy milk
[ ] id: 2 - Study sockets

DONE 1
Task 1 marked as done 

LST
[x] id: 1 - Buy milk
[ ] id: 2 - Study sockets

DEL 2
Task 2 removed successfully

EXIT
Bye!

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Technical Notes

• Implements the Strategy Pattern via a Map<Command, Function> for dynamic command execution.
• Tasks are persisted automatically to tasks.dat after every change.
• Unique IDs are managed in memory through TaskRepository#getNextId().
• Error handling covers invalid commands, incorrect input, and I/O exceptions.
• Modular architecture with clear separation between:
  • Commands layer (functionalities)
  • Persistence layer (TaskRepository)
  • Controller layer (TaskManager)
  • Model layer (Task)

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Future Improvements (v2)

• Introduce unit tests
• Introduce new commands
• Add filters for completed/uncompleted tasks
• Add timestamps for task creation/completion
• Support editing existing task descriptions
• Transition to a Java MVC Web version (Spring Boot + Thymeleaf)

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Requirements

• Java 17+
• Maven 3.8+

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© 2025 – Kátia Vilarinho
Version 1.1 – CLI Edition (OOP + File Persistence)