Flutter - How to use data from equal built classes?-CodePudding

I want to build an app for my pupil which generates tasks out of sentence blocks. For example I created two classes, apple and pear, with nearly the same structure. They return a question built out of the sentence blocks which are defined in the classes. In both classes is a GenerateQuestion()-function for that. Now I want to build some kind of overclass, which picks a random class of i.e. apple or pear and then returns the strings from the functions. The functions names are the same, but I can't figure out how to get data from a random choosen class. Hoping for help. Thanks in advance.

Update: Here is the code I wrote so far (I tried to translate it properly):

import 'dart:math';

 int randomminmax1 = 0;
 int randomminmax2 = 0;
 int randomminmax3 = 0;

 List classes = [apple, pear];

 class overClass {

   static pickClass(){
     int randomClassItem = Random().nextInt(classes.length);
     print(classes[randomClassItem]);
     return classes[randomClassItem];
   }
 }

class apple {

  static String giveQuestion()  {

    randomminmax1 = 2   Random().nextInt(15 - 2);
    randomminmax2 = randomminmax1 * (2 Random().nextInt(12 - 2));
    randomminmax3 = 2   Random().nextInt(30 - 2);

     List value_1 = [" boxes", " bags", " bucket"];
     List verbs = ["cost","have a price of", "are offered for"];
     List value_2 = ["Euro"];
     List questionWords = [""];

     int randomIndexValue1 = Random().nextInt(value_1.length);
     int randomIndexVerbs = Random().nextInt(verbs.length);
     int randomIndexValue2 = Random().nextInt(value_2.length);
     String value = randomminmax1.toString()   value_1[randomIndexValue1].toString()   " apples"    verbs[randomIndexVerbs].toString()   " "   randomminmax2.toString()   " "   value_2[randomIndexValue2].toString()   ".\n";
     String question = "How much are "   randomminmax3.toString()   value_1[randomIndexValue1].toString()   "?\n";
    return value   question;
  }

  static String giveAnswer(){
    double result = (randomminmax2/randomminmax1)*randomminmax3;
    return result.toStringAsFixed(2)   " Euro.";
  }
}

class pear {

  static String giveQuestion() {
    randomminmax1 = 2   Random().nextInt(15 - 2);
    randomminmax2 = randomminmax1 * (2 Random().nextInt(12 - 2));
    randomminmax3 = 2   Random().nextInt(30 - 2);

   List value_1 = [" boxes", " bags", " bucket"];
     List verbs = ["cost","have a price of", "are offered for"];
     List value_2 = ["Euro"];
     List questionWords = [""];

     int randomIndexValue1 = Random().nextInt(value_1.length);
     int randomIndexVerbs = Random().nextInt(verbs.length);
     int randomIndexValue2 = Random().nextInt(value_2.length);
     String value = randomminmax1.toString()   value_1[randomIndexValue1].toString()   " pears"    verbs[randomIndexVerbs].toString()   " "   randomminmax2.toString()   " "   value_2[randomIndexValue2].toString()   ".\n";
     String question = "How much are "   randomminmax3.toString()   value_1[randomIndexValue1].toString()   "?\n";
    return value   question;
  }

  static String giveAnswer(){
    double result = (randomminmax2/randomminmax1)*randomminmax3;
    return result.toStringAsFixed(2)   " Euro.";
  }
}

  static String giveAnswer(){
    double result = (randomminmax2/randomminmax1)*randomminmax3;
    return result.toStringAsFixed(2)   " Euro.";
  }
}

CodePudding user response：

Can you try to create a superclass that all question classes will inherit and then get the subclasses and programmatically call functions. Try to see here

CodePudding user response：

At least I managed to give my values directly from the classes into the list. But then I got problems with the int-variables, which were built wrong.

My "solution": I converted my classes into isolated flutter widgets, which works fine, except the problem that I'm not able to put the widgets into a list, from where they are picked randomly...but therefore I'll write a new post.

Thank you Moustapha for your help (the superclass idea sounds good, but way too hard to code for me) ;)!