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To-Do List Manager in Java (Source Code)

import java.util.*;

public class ToDoListManager {

// Task class to represent individual tasks
    static class Task {
        String name;
        boolean completed;

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

// Method to mark task as completed
        void markAsCompleted() {
            this.completed = true;
        }

// Override toString() method for displaying tasks
        @Override
        public String toString() {
            return (completed ? "[Completed] " : "[Not Completed] ") + name;
        }
    }

// List to store tasks
    private static List<Task> tasks = new ArrayList<>();

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

while (true) {
            System.out.println("\nTo-Do List Manager:");
            System.out.println("1. Add Task");
            System.out.println("2. Remove Task");
            System.out.println("3. List Tasks");
            System.out.println("4. Mark Task as Completed");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");
            command = scanner.nextLine();

switch (command) {
                case "1":
                    addTask(scanner);
                    break;
                case "2":
                    removeTask(scanner);
                    break;
                case "3":
                    listTasks();
                    break;
                case "4":
                    markTaskAsCompleted(scanner);
                    break;
                case "5":
                    System.out.println("Exiting...");
                    scanner.close();
                    return;
                default:
                    System.out.println("Invalid choice, please try again.");
            }
        }
    }

// Method to add a task
    private static void addTask(Scanner scanner) {
        System.out.print("Enter task description: ");
        String taskDescription = scanner.nextLine();
        tasks.add(new Task(taskDescription));
        System.out.println("Task added!");
    }

// Method to remove a task
    private static void removeTask(Scanner scanner) {
        System.out.println("Enter task number to remove:");
        listTasks();
        int taskNumber = Integer.parseInt(scanner.nextLine());
        
        if (taskNumber > 0 && taskNumber <= tasks.size()) {
            tasks.remove(taskNumber - 1);
            System.out.println("Task removed!");
        } else {
            System.out.println("Invalid task number.");
        }
    }

// Method to list all tasks
    private static void listTasks() {
        if (tasks.isEmpty()) {
            System.out.println("No tasks to display.");
        } else {
            for (int i = 0; i < tasks.size(); i++) {
                System.out.println((i + 1) + ". " + tasks.get(i));
            }
        }
    }

// Method to mark a task as completed
    private static void markTaskAsCompleted(Scanner scanner) {
        System.out.println("Enter task number to mark as completed:");
        listTasks();
        int taskNumber = Integer.parseInt(scanner.nextLine());
        
        if (taskNumber > 0 && taskNumber <= tasks.size()) {
            tasks.get(taskNumber - 1).markAsCompleted();
            System.out.println("Task marked as completed!");
        } else {
            System.out.println("Invalid task number.");
        }
    }
}

Explanation:

1. Task Class:

‣ Each task has a name (String name) and a completion status (boolean completed).

‣ There is a method markAsCompleted() to mark the task as completed.

‣ The toString() method formats the task display to show whether it's completed or not.

2. Main Program:

‣ A List(Task) stores all the tasks.

‣ The user can choose from the following actions:
◙ Add a task.
◙ Remove a task.
◙ List all tasks.
◙ Mark a task as completed.

‣ The program loops until the user chooses to exit.

How to run:

1. Copy the code into a file called ToDoListManager.java.
2. Compile and run the program: 3. Follow the prompts in the console to manage your to-do list.

With this code, you can develop To-Do List Manager in Java to fit your needs.

To-Do List Manager in Java (Source Code)

Explanation:

How to run:

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