PublishSubject emmiting value when a private Observable is completed

PublishSubjectEmitOnObservableCompleted.java

public class Main {

    public static void main(String [] args) {

        final PublishSubject<Boolean> subject = PublishSubject.create();

        subject.subscribe(new Observer<Boolean>() {
            @Override
            public void onCompleted() {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onNext(Boolean aBoolean) {
                System.out.println("Observable completed");
            }
        });

        Observable.create(new Observable.OnSubscribe<Integer>() {
            @Override
            public void call(Subscriber<? super Integer> subscriber) {
                for (int i = 0; i < 5; i++) {
                    subscriber.onNext(i);
                }
                subscriber.onCompleted();
            }
        }).doOnCompleted(new Action0() {
            @Override
            public void call() {
                subject.onNext(true);
            }
        }).subscribe();

    }

}