java unable to get value of static variable from the same class

Question

I have a AppConstants class where I have some static variables and static methods. Variable like

public static final String BASE_URL = "http://www.somevalue.com/api/";
private static String MID_FIX_API;
public static final String API_CALL = BASE_URL + getMidFixApi() + "/" + GET_KEY(appContext, KEY_FOR_KEY);

As MID_FIX_API is private so I have its public getter/setter. When I set its value from another class by its setter method AppConstants.setMidFixApi("value"); and get its value from its getter method AppConstants.getMidFixApi(); Everything is fine till now
But
The problem comes when after the above lines I call static variable API_CALL shown in the code above that get value from the getter of the variable MID_FIX_API and return null despite of that we have passed value to it before.

This is the whole sequence of lines

AppConstants.setMidFixApi("getCategories");   // setting value
Log.e("InsideSuccess", "MID_FIX_API = " + AppConstants.getMidFixApi());  // working fine till here

Log.e("InsideSuccess", "API_URL = "+AppConstants.API_CALL);   // here I'm getting like this http://www.somevalue.com/api/null/somePostFix

Please point me what I'm doing wrong.

API_CALL is a compile time constant.

Prashant
– Prashant

2017-10-30 10:02:07 +00:00
Commented Oct 30, 2017 at 10:02 — Prashant
– Prashant, Commented Oct 30, 2017 at 10:02
Thanks +1 for all the helpers.

Inzimam Tariq IT
– Inzimam Tariq IT

2017-10-30 10:08:46 +00:00
Commented Oct 30, 2017 at 10:08 — Inzimam Tariq IT
– Inzimam Tariq IT, Commented Oct 30, 2017 at 10:08

Lino · Accepted Answer · 2017-10-30 10:03:02Z

1

As already mentioned the variable API_CALL is initialized once, with the current value of MID_FIX_API which initially is null.

A work around is to create a static method (getApiCall()) which just computes the value which earlier was staticly initialized, which would just look as easy as this:

public static String getApiCall(){
    return BASE_URL + getMidFixApi() + "/" + GET_KEY(appContext, KEY_FOR_KEY);
}

Which then can be called in an easy manner AppConstants.getApiCall().

answered Oct 30, 2017 at 10:03

Lino

20k6 gold badges55 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Per Huss · Accepted Answer · 2017-10-30 09:59:55Z

1

This has to to with initialisation order. When you call AppConstants.setMidFixApi("getCategories") the AppConstants class will be initialised before the value is set. Hence when the API_CALL is initialised, the MID_FIX_API is not yet assigned...

answered Oct 30, 2017 at 9:59

Per Huss

5,12516 silver badges34 bronze badges

1 Comment

Inzimam Tariq IT Over a year ago

so I need to change API_Call value too while calling AppConstants.setMidFixApi("getCategories")?

Collectives™ on Stack Overflow

java unable to get value of static variable from the same class

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related