Create a method that returns a class and then access the variables

Question

I have a class Fruits that consists of certain variables:

public class Fruits {
  public static String abc="something";
}

public class Apple extends Fruits {
  public static String abc="something";
}

Depending on the config it selects whether it should return an instance of Fruits or Apple:

Class Fruits{
  public static Fruits getfruit{
    if(config==3) {
      return new Apple();
    } else {
      return new Fruits();
    }
  }
}

So later I can use Utility.getfruit().abc.

Sorry, do you want to create a class based on a property/configuration? — André
– André, Commented Jan 20, 2022 at 8:33
a Class doesn't have access to instance methods. Instances of the class do. You are trying to call constructors, but you forget the ()'s, like: return new Procedures(); It's also String, not string, and to clarify, your classes don't have instance variables — Stultuske
– Stultuske, Commented Jan 20, 2022 at 8:35
@SSinha 1500 variables (from the other comments, information is missing in question) is a bit much... maybe you should think about a different data model (Map, List, ...) — user16320675
– user16320675, Commented Jan 20, 2022 at 9:17
@SSinha please have a look - mkyong.com/java/java-properties-file-examples — André
– André, Commented Jan 20, 2022 at 9:19
Just use instance variables instead of static variables and two objects of the same class. — Holger
– Holger, Commented Jan 21, 2022 at 8:01

SSMorgan · Accepted Answer · 2022-01-20 14:53:30Z

1

If abc is gonna be always the same you can just keep the one in the parent class, you will always be able to access it whether your instance is of a parent or a child class.

If the value of abc is different per child class, create a method public String getAbc() in the parent class and override it in each child that needs a different value:

public class Fruits {
   public static string abc="something";

   public String getAbc() {
      return abc;
   } 
}

public class Apple extends Fruits {
   public static string abc="something different";

   @Override
   public String getAbc() {
      return abc;
   } 
}

And so, in your final call use it this way:

Utility.getfruit().getAbc();

edited Jan 20, 2022 at 14:53

SSMorgan

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answered Jan 20, 2022 at 8:39

gmanjon

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2 Comments

SSMorgan Over a year ago

Thanks I understood but a little problem I have over more than 1500 variables so do I have to generate getter for all ?

gmanjon Over a year ago

You can give it a try using Lombok. Although I don't know if they have something for gettters for static fields.

SRM Kumar · Accepted Answer · 2022-01-20 14:20:42Z

Add a method in the parent class Fruits and override that method in child class Apple .

when you call that method with instance that you got from getfruit will work.

sample code

public class UtilityDemo {
    static int config = 3;
    public static Fruits getfruit() {
        if (config == 3) {
            return new Fruits();
        } else
            return new Apple();
    }

    public static void main(String args[]) {
        System.out.println(getfruit().getAbc());
    }
}


public class Fruits {
    public static String abc = "From Fruits";
    public String getAbc() {
        return abc;
    }
}


public class Apple extends Fruits {
    public static String abc = "From Apple";
    @Override
    public String getAbc() {
        return abc;
    }
}

but why is there a need for an instance? There aren't instance variables.
Thanks I understood but a little problem I have over more than 1500 variables so do I have to generate getter for all ?
they are not instance variables but Question asked is they want instance of class right? @Stultuske
That's how it is @SSinha we need to generate Getters and Setters for all the variables.

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