TO-DO-List

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

class Task { private String title; private boolean isDone;

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

public String getTitle() { return title; }

public boolean isDone() { return isDone; }

public void markAsDone() { isDone = true; }

@Override public String toString() { return (isDone ? "[x] " : "[ ] ") + title; } }

public class ToDoListApp { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ArrayList tasks = new ArrayList<>(); int choice;

do {
    System.out.println("\nTo-Do List Menu:");
    System.out.println("1. Add task");
    System.out.println("2. View tasks");
    System.out.println("3. Mark task as done");
    System.out.println("4. Remove task");
    System.out.println("5. Exit");
    System.out.print("Enter your choice: ");

    while (!scanner.hasNextInt()) {
        System.out.print("Invalid input. Enter a number: ");
        scanner.next();
    }

    choice = scanner.nextInt();
    scanner.nextLine();

    switch (choice) {
        case 1:
            System.out.print("Enter task title: ");
            String title = scanner.nextLine();
            tasks.add(new Task(title));
            System.out.println("Task added.");
            break;
        case 2:
            if (tasks.isEmpty()) {
                System.out.println("No tasks found.");
            } else {
                for (int i = 0; i < tasks.size(); i++) {
                    System.out.println((i + 1) + ". " + tasks.get(i));
                }
            }
            break;
        case 3:
            System.out.print("Enter task number to mark as done: ");
            int doneIndex = scanner.nextInt() - 1;
            if (doneIndex >= 0 && doneIndex < tasks.size()) {
                tasks.get(doneIndex).markAsDone();
                System.out.println("Task marked as done.");
            } else {
                System.out.println("Invalid task number.");
            }
            break;
        case 4:
            System.out.print("Enter task number to remove: ");
            int removeIndex = scanner.nextInt() - 1;
            if (removeIndex >= 0 && removeIndex < tasks.size()) {
                tasks.remove(removeIndex);
                System.out.println("Task removed.");
            } else {
                System.out.println("Invalid task number.");
            }
            break;
        case 5:
            System.out.println("Exiting To-Do List. Goodbye!");
            break;
        default:
            System.out.println("Invalid choice.");
    }

} while (choice != 5);

scanner.close();

} }