Question 194254 in Flutter Question posted in
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Flutter – Trying to declare a class, needs a "home" body?

I am trying to make a class with a list of numbered events and then will use that in another class.

import 'package:flutter/material.dart';

// a list of events indexed by number
class EventList{
  Map<int, String> event_list = {};

  EventList(){
    event_list[0] = "Hello!";
  }
}

However, when I try an use it in my main class, I get an error:

EventList eventList();

The error is:

error: 'eventList' must have a method body because '_homeState' isn't abstract. (concrete_class_with_abstract_member at [citadel_test] libpageshome.dart:12)

I realize I can’t use an empty constructor, but even when I change it to use an optional color paramter, I get the same error.

Tags:

2

Answers


  1. 0

    Update your code like this

    // a list of events indexed by number
class EventList {
  Map<int, String> event_list = {};

  EventList() {
    event_list = {0: "Hello!"};
  }
}

    then use it like this

    EventList eventList = EventList();
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  2. 0 
    EventList eventList();

    This is not a constructor call. This is the declaration of a method called eventList, taking no parameters and returning an EventList. It is just the declaration, with no body (code in { and }). That is why you get the error, that you class cannot have a method with no body.

    If you want a field of type EventList in your class, it needs to be:

    EventList eventList = EventList();

    This creates a field of type EventList and fills it with the result of the constructor call.

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