Do the following codes do the same thing?

```java
    public <U> Observable<T> delay(
            final Func1<? super T, ? extends Observable<U>> itemDelay) {
        return flatMap(new Func1<T, Observable<T>>() {
            @Override
            public Observable<T> call(final T t1) {
                return itemDelay.call(t1).take(1).map(new Func1<U, T>() {
                    @Override
                    public T call(U ignored) {
                        return t1;
                    }
                });
            }
        });
    }
```