How to wait for callback to finish?

Question

Java

Есть код
MyTwitterSession.getInstance().setSession(result);
TwitterSession session = MyTwitterSession.getInstance().getSession();
new MyTwitterApiClient(session).getStatusesService().userTimeline(null, session.getUserName(), 10, null, null, null, null, null, null, new Callback>() {
@Override
public void success(Result> result) {;
MyTwitterSession.getInstance().setTweets(result.data);
}
@Override
public void failure(TwitterException e) {
}
});
MyTwitterSession is a singleton class. How can I wait for the callback to complete? At the time when it is necessary to use a field from a singleton class, it is null.

Answer 1

if I understand the question correctly, then you do not understand the essence of asynchronous task execution.
No way.
It doesn't depend on you when the request is executed, you just handle the result of success/failure