CODEWITHSUNDEEP
java
Angela Marie-Daley
Angela Marie-Daley

Reputation: 314

Call object of Static Inner Class

I'm trying to call an object from a static member class, but I get an exceptionInitializationError. Please could you look at my code and let me know what's wrong?

import java.util.ArrayList;
public class StaticInit {

public static void main(String[] args) throws Exception {



    ArrayList<Olive> olives = OliveJar.olives;

 for( Olive o : olives) {
     System.out.println(o);
 }

    }

public static class OliveJar {
        public static ArrayList<Olive> olives;

         static {
            olives.add(new Olive("Olive 1!", 10));
            olives.add(new Olive("Olive 2!", 30));
            olives.add(new Olive("Olive 3", 10));
            System.out.println("Initialization Successful. Your Jar Contains " + olives.size() + " Olives.");

        }

    }
}

Upvotes: 2

Views: 70

Answers (4)

chrylis -cautiouslyoptimistic-
chrylis -cautiouslyoptimistic-

Reputation: 77177

Your nested class has a field olives that you never initialize, so you get an exception when calling add. Assign an object to it:

olives = new ArrayList<>();

Additionally, both public and static fields are usually poor design. It's not clear what you're doing here, but this pattern shouldn't be used in real code.

Upvotes: 0

SalmonKiller
SalmonKiller

Reputation: 2203

Change public static ArrayList<Olive> olives; to public static ArrayList<Olive> olives = new ArrayList<>;.

Upvotes: 0

Bruce
Bruce

Reputation: 8849

initialize your array 

public static ArrayList<Olive> olives=new ArrayList<Olive>();

Upvotes: 1

Jigar Joshi
Jigar Joshi

Reputation: 240870

ExceptionInitializerError is becuase you haven't initialized olives

add

olives = new ArrayList<Olive>();

before adding instances to list in static initializer block

Upvotes: 1

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