To-Do List Adventure

Greetings, fellow procrastinators! Today, we embark on a Java journey to conquer the chaos of our lives with the power of... a To-Do List! 📝

The Cast of Characters Task: Meet our little minions of productivity. Each task has a title (like "Conquer the world") and a secret mission: to be completed or not to be completed, that is the question! 🤨

Category: The taskmaster! Categories are like the generals of our to-do army. They organize tasks into armies, uh, I mean categories, with names like "Personal" or "Work."

ToDoList: The grand organizer. This is our commander-in-chief, managing our categories and ensuring that no task is left behind!

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

// Task class to represent individual tasks
class Task {
    private String title;
    private boolean completed;

    public Task(String title) {
        this.title = title;
        this.completed = false;
    }

    public String getTitle() {
        return title;
    }

    public boolean isCompleted() {
        return completed;
    }

    public void markCompleted() {
        completed = true;
    }

    @Override
    public String toString() {
        return title + (completed ? " (Completed)" : "");
    }
}

// Category class to group tasks
class Category {
    private String name;
    private List<Task> tasks;

    public Category(String name) {
        this.name = name;
        this.tasks = new ArrayList<>();
    }

    public String getName() {
        return name;
    }

    public void addTask(Task task) {
        tasks.add(task);
    }

    public List<Task> getTasks() {
        return tasks;
    }

    @Override
    public String toString() {
        return name + " (" + tasks.size() + " tasks)";
    }
}

// ToDoList class to manage categories and tasks
class ToDoList {
    private List<Category> categories;

    public ToDoList() {
        this.categories = new ArrayList<>();
    }

    public void addCategory(Category category) {
        categories.add(category);
    }

    public List<Category> getCategories() {
        return categories;
    }

    public static void main(String[] args) {
        // Create a ToDoList
        ToDoList myToDoList = new ToDoList();

        // Create categories
        Category personal = new Category("Personal");
        Category work = new Category("Work");

        // Create tasks and add them to categories
        Task task1 = new Task("Buy groceries");
        Task task2 = new Task("Finish report");
        Task task3 = new Task("Go to the gym");

        personal.addTask(task1);
        work.addTask(task2);
        personal.addTask(task3);

        // Add categories to the ToDoList
        myToDoList.addCategory(personal);
        myToDoList.addCategory(work);

        // Display tasks and categories
        for (Category category : myToDoList.getCategories()) {
            System.out.println(category);
            for (Task task : category.getTasks()) {
                System.out.println("  - " + task);
            }
        }
    }
}

In this Java example:

Task represents individual tasks with a title and completion status. Category represents task categories and contains a list of tasks. ToDoList manages categories and provides a way to add categories and retrieve them. In the main method, we create a ToDoList, add categories (personal and work), create tasks, and associate them with the respective categories. Finally, we display the tasks grouped by categories.

You can further extend this To-Do List Application to include features like task due dates, task priority, and persistence to store tasks in a file or database.

Low Level Design

Building an Todo List Application in TypeScript

To-Do List Adventure