Java Mini Project - To-Do List Application
Objective: Develop a simple to-do list application using Java with an emphasis on functions and data structures.
Key Features:
- Method to add a task
- Method to delete a task
- Method to display the list of tasks
- Method to mark a task as complete
Data Structure Used: ArrayList
Code:
Import java.util.ArrayList;
Import java.util.Scanner;
Public class ToDoList {
Static class Task {
String description;
Boolean isCompleted;
Task(String description) {
This.description = description;
This.isCompleted = false;
}
Public String toString() {
Return (isCompleted ? “[✓] “ : “[ ] “) + description;
}
}
Static ArrayList<Task> tasks = new ArrayList<>();
Public static void addTask(String description) {
Tasks.add(new Task(description));
System.out.println(“Task added successfully!”);
}
Public static void deleteTask(int index) {
If (index >= 0 && index < tasks.size()) {
Tasks.remove(index);
System.out.println(“Task deleted successfully!”);
} else {
System.out.println(“Invalid task number.”);
}
}
Public static void markAsComplete(int index) {
If (index >= 0 && index < tasks.size()) {
Tasks.get(index).isCompleted = true;
System.out.println(“Task marked as complete!”);
} else {
System.out.println(“Invalid task number.”);
}
}
Public static void displayTasks() {
If (tasks.isEmpty()) {
System.out.println(“Your to-do list is empty!”);
} else {
System.out.println(“To-Do List:”);
For (int I = 0; I < tasks.size(); i++) {
System.out.println((I + 1) + “. “ + tasks.get(i));
}
}
}
Public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Int choice;
Do {
System.out.println(“\nTo-Do List Application:”);
System.out.println(“1. Add Task”);
System.out.println(“2. Delete Task”);
System.out.println(“3. Display Tasks”);
System.out.println(“4. Mark Task as Complete”);
System.out.println(“5. Exit”);
System.out.print(“Enter your choice: “);
Choice = sc.nextInt();
Sc.nextLine(); // consume newline
Switch (choice) {
Case 1:
System.out.print(“Enter task description: “);
String desc = sc.nextLine();
addTask(desc);
break;
case 2:
displayTasks();
System.out.print(“Enter task number to delete: “);
Int delIndex = sc.nextInt() – 1;
deleteTask(delIndex);
break;
case 3:
displayTasks();
break;
case 4:
displayTasks();
System.out.print(“Enter task number to mark as complete: “);
Int compIndex = sc.nextInt() – 1;
markAsComplete(compIndex);
break;
case 5:
System.out.println(“Exiting the application…”);
Break;
Default:
System.out.println(“Invalid choice. Try again.”);
}
} while (choice != 5);
Sc.close();
}
}
Output Screenshot :
