Java get/set class not accessible in static context

Question

I am attempting to create get/set class with Java. However, I am having trouble getting the data back from the class afterwards.

public class ARNStorage {
    String arnStorage;

    public String getArnStorage() {
        System.out.println("Got endpoint: " + this.arnStorage);
        return arnStorage;
    }
    public void setArnStorage(String arnStorage) {
        this.arnStorage = arnStorage;
        System.out.println("Saved endpoint: " + this.arnStorage);
    }
}

To store the String, I use the following (this works)

public void storeEndpointArn(String endpointArn) {
    ARNStorage endPoint = new ARNStorage();
    endPoint.setArnStorage(endpointArn);
    System.out.println("Storing endpoint: " + endpointArn);
}

However, to retrieve the String, I attempt retrieve it this way

public String retrieveEndpointArn() {
    String endPointArn = ARNStorage.getArnStorage();
    System.out.println("Retrieved endpoint: " + endPointArn);
    return endPointArn;
}

However, this returns a non-static method getArnStorage() which cannot be retrieved from a static context. My understanding a static context is that it cannot be called on something that doesn't exist.

Answer 1

You create a ARNStorage local variable in the storing method and in the retrieval method, you don't use a ARNStorage instance but the class itself.
It makes no sense.
You should use an instance in both cases and the same.

To achieve it, the ARNStorage endPoint should be a instance field of the class and not a local variable if you want to reuse it from another method.

For example, you could have :

public class ClientClass{

    private ARNStorage endPoint;

    public void storeEndpointArn(String endpointArn) {    
        endPoint = new ARNStorage();
        endPoint.setArnStorage(endpointArn);
        System.out.println("Storing endpoint: " + endpointArn);
    }

    public String retrieveEndpointArn() {
        String endPointArn = endPoint.getArnStorage();
        System.out.println("Retrieved endpoint: " + endPointArn);
        return endPointArn;
    }
}