Introduction

The Task Reminder Application in Java is a simple yet effective tool for managing tasks and setting reminders. The program allows users to create, view, and delete tasks, and it provides a notification when a task is due. This is an excellent project for beginners to get hands-on experience with basic Java programming concepts like arrays, loops, and date/time handling.

Objective

The objective of this project is to develop a task reminder application using Java. It will enable users to:

• Set tasks with due dates.
• View the list of tasks and their statuses.
• Delete completed tasks.
• Set reminders for tasks and get notified when the task is due.

Java Code for Task Reminder Application

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Date;
import java.text.SimpleDateFormat;

class Task {
    String taskName;
    String dueDate;
    
    public Task(String taskName, String dueDate) {
        this.taskName = taskName;
        this.dueDate = dueDate;
    }
    
    @Override
    public String toString() {
        return "Task: " + taskName + ", Due Date: " + dueDate;
    }
}

public class TaskReminderApp {
    private static ArrayList taskList = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);
    
    public static void main(String[] args) {
        while (true) {
            displayMenu();
            int choice = scanner.nextInt();
            scanner.nextLine();  // consume the newline
            switch (choice) {
                case 1:
                    addTask();
                    break;
                case 2:
                    viewTasks();
                    break;
                case 3:
                    deleteTask();
                    break;
                case 4:
                    checkReminder();
                    break;
                case 5:
                    System.out.println("Exiting the Task Reminder application. Goodbye!");
                    return;
                default:
                    System.out.println("Invalid option, please try again.");
            }
        }
    }
    
    public static void displayMenu() {
        System.out.println("\nTask Reminder Application Menu");
        System.out.println("1. Add a Task");
        System.out.println("2. View Tasks");
        System.out.println("3. Delete a Task");
        System.out.println("4. Check Reminders");
        System.out.println("5. Exit");
        System.out.print("Choose an option: ");
    }
    
    public static void addTask() {
        System.out.print("Enter task name: ");
        String taskName = scanner.nextLine();
        System.out.print("Enter due date (yyyy-MM-dd): ");
        String dueDate = scanner.nextLine();
        taskList.add(new Task(taskName, dueDate));
        System.out.println("Task added successfully!");
    }
    
    public static void viewTasks() {
        if (taskList.isEmpty()) {
            System.out.println("No tasks available.");
        } else {
            System.out.println("\nCurrent Tasks:");
            for (Task task : taskList) {
                System.out.println(task);
            }
        }
    }
    
    public static void deleteTask() {
        System.out.print("Enter task name to delete: ");
        String taskName = scanner.nextLine();
        boolean taskFound = false;
        for (Task task : taskList) {
            if (task.taskName.equalsIgnoreCase(taskName)) {
                taskList.remove(task);
                System.out.println("Task deleted successfully!");
                taskFound = true;
                break;
            }
        }
        if (!taskFound) {
            System.out.println("Task not found.");
        }
    }
    
    public static void checkReminder() {
        String currentDate = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        boolean reminderFound = false;
        for (Task task : taskList) {
            if (task.dueDate.equals(currentDate)) {
                System.out.println("Reminder: " + task);
                reminderFound = true;
            }
        }
        if (!reminderFound) {
            System.out.println("No tasks are due today.");
        }
    }
}

Explanation of the Program Structure

The program has a simple structure consisting of the following parts:

• Task Class: This represents a task with two attributes: the task’s name and its due date.
• TaskReminderApp Class: This is the main class where the application logic resides. It contains methods to display the menu, add tasks, view tasks, delete tasks, and check for reminders.
• Scanner: It is used to take user input from the console.
• ArrayList: It stores the list of tasks created by the user.
• SimpleDateFormat: It is used to format the current date and compare it with the task due dates.

How to Run the Program

Follow these steps to run the Task Reminder application:

1. 1. Install Java Development Kit (JDK) on your system if it’s not already installed.
   2. Save the code in a file named TaskReminderApp.java.
   3. Open a terminal or command prompt, navigate to the directory containing the file, and compile the program by running the following command:

javac TaskReminderApp.java

1. 1. Run the program with the following command:

java TaskReminderApp

1. The program will start, and you can interact with the menu to manage tasks and set reminders.