RxJava2.X学习--Observable.create自定义发射次数

Observable.create(new ObservableOnSubscribe<String>() {
            @Override
            public void subscribe(ObservableEmitter<String> e) throws Exception {
                //自定义发射次数
                e.onNext("1");
                e.onNext("2");
                e.onNext("3");
            }
        }).subscribe(new Observer<String>() {
            @Override
            public void onSubscribe(Disposable d) {

            }

            @Override
            public void onNext(String value) {

            }

            @Override
            public void onError(Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });