RxJavaフレームワークでのデザインパターンの適用

Observable<Integer> observable = Observable.create(emitter -> {
    emitter.onNext(1);
    emitter.onNext(2);
    emitter.onNext(3);
    emitter.onComplete();
});

Observer<Integer> observer = new Observer<Integer>() {
    @Override
    public void onNext(Integer item) {
        System.out.println(item);
    }

    @Override
    public void onError(Throwable throwable) {
        // 处理错误
    }

    @Override
    public void onComplete() {
        System.out.println("完成");
    }
};

observable.subscribe(observer);

Flowable<Integer> flowable = Flowable.create(emitter -> {
    for (int i = 0; i < 10; i++) {
        emitter.onNext(i);
    }
    emitter.onComplete();
}, BackpressureStrategy.BUFFER);

Subscriber<Integer> subscriber = new Subscriber<Integer>() {
    @Override
    public void onNext(Integer item) {
        System.out.println(item);
    }

    @Override
    public void onError(Throwable throwable) {
        // 处理错误
    }

    @Override
    public void onComplete() {
        System.out.println("完成");
    }
};

flowable.subscribe(subscriber);

Single<String> single = Single.fromCallable(() -> {
    return "Hello, world!";
});

single.subscribe(item -> {
    System.out.println(item);
});