To be able to retrieve and store the details of a todo, we need a Todo bean and a service to retrieve and store the details.

Let's create a Todo bean:

    public class Todo {
      private int id;
      private String user;

      private String desc;

      private Date targetDate;
      private boolean isDone;

      public Todo() {}
 
      public Todo(int id, String user, String desc, 
      Date targetDate, boolean isDone) { 
        super();
        this.id = id;
        this.user = user;
        this.desc = desc;
        this.targetDate = targetDate;
        this.isDone = isDone;
      }

       //ALL Getters
    }

We have a created a simple Todo bean with the ID, the name of the user, the description of the todo, the todo target date, and an indicator for the completion status. We have added a constructor and getters for all the fields.

Let's add TodoService now. To keep things simple, this service does not talk to the database. It maintains an in-memory array list of todos. This list is initialized using a static initializer:

@Service
public class TodoService {

   private static List<Todo> todos = new ArrayList<Todo>();

   private static int todoCount = 3;

   static {
      todos.add(new Todo(1, "Jack", "Learn Spring MVC", new Date(), false));
      todos.add(new Todo(2, "Jack", "Learn Struts", new Date(), false));
      todos.add(new Todo(3, "Jill", "Learn Hibernate", new Date(), false));
   }

Some of the important methods are as follows:

   public List<Todo> retrieveTodos(String user) {
      //returns all todos for a given users
   }

   public Todo addTodo(String name, String desc, Date targetDate, boolean isDone) {
       //logic for adding a todo
   }

   public Todo retrieveTodo(int id) {
        //retrieve a todo
   }

   public Todo update(Todo todo) {
      //update a todo
   }

   public Todo deleteById(int id) {
      //delete a todo
   }
}

Now that we have the service and the bean ready, we can create our first service to retrieve a list of todos for a user.