{"id":145723,"date":"2025-07-02T11:59:34","date_gmt":"2025-07-02T06:29:34","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145723"},"modified":"2025-07-02T11:59:34","modified_gmt":"2025-07-02T06:29:34","slug":"to-do-list-in-dsa-java","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/to-do-list-in-dsa-java\/","title":{"rendered":"DSA Java Project &#8211; To Do List"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\/\/ To-Do List Using Singly Linked List\r\n\r\nimport java.util.Scanner;\r\n\r\nclass Task \r\n{\r\n    int id;\r\n    String description;\r\n    boolean completed;\r\n    Task next;\r\n\r\n    public Task(int id, String description) \r\n    {\r\n        this.id = id;\r\n        this.description = description;\r\n        this.completed = false;\r\n        this.next = null;\r\n    }\r\n}\r\n\r\nclass ToDoList \r\n{\r\n    private Task head;\r\n    private int taskCount;\r\n\r\n    public ToDoList() \r\n    {\r\n        head = null;\r\n        taskCount = 0;\r\n    }\r\n\r\n    public void addTask(Scanner scanner) \r\n    {\r\n        scanner.nextLine();  \/\/ clear buffer\r\n        System.out.print(\"Enter task description: \");\r\n        String desc = scanner.nextLine();\r\n\r\n        Task newTask = new Task(++taskCount, desc);\r\n\r\n        if (head == null) \r\n        {\r\n            head = newTask;\r\n        } else {\r\n            Task temp = head;\r\n            while (temp.next != null) {\r\n                temp = temp.next;\r\n            }\r\n            temp.next = newTask;\r\n        }\r\n\r\n        System.out.println(\"Task added successfully.\");\r\n    }\r\n\r\n    public void displayTasks() \r\n    {\r\n        if (head == null)\r\n        {\r\n            System.out.println(\"To-Do List is empty.\");\r\n            return;\r\n        }\r\n\r\n        System.out.println(\"\\nTo-Do List:\");\r\n        Task temp = head;\r\n        while (temp != null)\r\n         {\r\n            String status = temp.completed ? \"[X]\" : \"[ ]\";\r\n            System.out.println(\"ID: \" + temp.id + \" | \" + status + \" \" + temp.description);\r\n            temp = temp.next;\r\n        }\r\n    }\r\n\r\n    public void markCompleted(Scanner scanner) {\r\n        System.out.print(\"Enter task ID to mark as completed: \");\r\n        int id = scanner.nextInt();\r\n\r\n        Task temp = head;\r\n        while (temp != null) \r\n        {\r\n            if (temp.id == id) \r\n            {\r\n                temp.completed = true;\r\n                System.out.println(\"Task marked as completed.\");\r\n                return;\r\n            }\r\n            temp = temp.next;\r\n        }\r\n\r\n        System.out.println(\"Task with ID \" + id + \" not found.\");\r\n    }\r\n\r\n    public void deleteTask(Scanner scanner) \r\n    {\r\n        System.out.print(\"Enter task ID to delete: \");\r\n        int id = scanner.nextInt();\r\n\r\n        Task temp = head;\r\n        Task prev = null;\r\n\r\n        while (temp != null &amp;&amp; temp.id != id) {\r\n            prev = temp;\r\n            temp = temp.next;\r\n        }\r\n\r\n        if (temp == null) {\r\n            System.out.println(\"Task with ID \" + id + \" not found.\");\r\n            return;\r\n        }\r\n\r\n        if (prev == null) {\r\n            head = temp.next;\r\n        } else {\r\n            prev.next = temp.next;\r\n        }\r\n\r\n        System.out.println(\"Task deleted successfully.\");\r\n    }\r\n}\r\n\r\npublic class ToDoListApp\r\n{\r\n    public static void main(String[] args) {\r\n        Scanner scanner = new Scanner(System.in);\r\n        ToDoList list = new ToDoList();\r\n        int choice;\r\n\r\n        do {\r\n            System.out.println(\"\\n----- To-Do List Menu -----\");\r\n            System.out.println(\"1. Add Task\");\r\n            System.out.println(\"2. Display Tasks\");\r\n            System.out.println(\"3. Mark Task as Completed\");\r\n            System.out.println(\"4. Delete Task\");\r\n            System.out.println(\"5. Exit\");\r\n            System.out.println(\"---------------------------\");\r\n            System.out.print(\"Enter your choice: \");\r\n\r\n            while (!scanner.hasNextInt()) {\r\n                System.out.println(\"Please enter a valid number.\");\r\n                scanner.next(); \/\/ clear invalid input\r\n            }\r\n\r\n            choice = scanner.nextInt();\r\n\r\n            switch (choice) {\r\n                case 1:\r\n                    list.addTask(scanner);\r\n                    break;\r\n                case 2:\r\n                    list.displayTasks();\r\n                    break;\r\n                case 3:\r\n                    list.markCompleted(scanner);\r\n                    break;\r\n                case 4:\r\n                    list.deleteTask(scanner);\r\n                    break;\r\n                case 5:\r\n                    System.out.println(\"Exiting program.\");\r\n                    break;\r\n                default:\r\n                    System.out.println(\"Invalid choice. Try again.\");\r\n            }\r\n\r\n        } while (choice != 5);\r\n\r\n        scanner.close();\r\n    }\r\n}<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 \/\/ To-Do List Using Singly Linked List import java.util.Scanner; class Task { int id; String description; boolean completed; Task next; public Task(int id, String description) { this.id = id; this.description = description;&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31451],"tags":[34786,32295,32318,32316,32317,34791,34797,34798,22641,34796,34103],"class_list":["post-145723","post","type-post","status-publish","format-standard","hentry","category-dsa-java-tutorials","tag-data-structures-algorithms","tag-data-structures-using-java","tag-dsa-java","tag-dsa-java-practical","tag-dsa-java-program","tag-dsa-java-project","tag-dsa-java-to-do-list","tag-dsa-java-to-do-list-project","tag-to-do-list","tag-to-do-list-in-dsa-java","tag-to-do-list-project"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA Java Project - To Do List - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/to-do-list-in-dsa-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA Java Project - To Do List - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/ To-Do List Using Singly Linked List import java.util.Scanner; 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