How to use String ressource in Java file in Android without a Layout

I have a Java class that mainly contains strings. It does not have a layout as it is neither a Fragment nor an Activity. It is more used as an auxilliary class. I would like to assign the String values in the class by using the Resource strings as I would like to automatically translate the Strings. Howvever, I can't access the string resources from Java. I use the following code:

 static String more = getString(R.string.more);

And in the XML file I have the ressource:

<string name="more">More</string>

I get the error message

Cannot resolve method 'getString' 

I also tried static String more = getContext().getString(R.string.more);
but I got the error message:

Cannot resolve method 'getContext'

Would anyone mind helping me on that? I'd appreciate every comment.

Update: I tried to use the answer from "MikaelM"

Resources.getSystem().getString(R.string.more)

However, I get an "exception in initializer error" and when I use the initial String again, I do not get this error. So I still can't get the String from the ressource. DO you have an idea what I can do? I'd appreciate every further comment.
So the error is caused by "Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x7f120038"
The strange thing is that the resource in fact exists (I checked this several times).

You should be able to get your string with:

Resources.getSystem().getString(R.string.more)

See more here, https://stackoverflow.com/questions/4253328/getstring-outside-of-a-context-or-activity

getString(R.string...

is not the same as

Resources.getSystem().getString(android.R.string...

Only the second variant you can use in the static context. Alas, you can get this way only system resources.

If you need to get your own resources, no one-line solution exists. Use https://stackoverflow.com/a/4391811/715269 solution of @Cristian. And notice: it is a very good solution, even more, it is the solution meant to be used by the creators of Android.