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Observable and Observer

Explore the relationship between Observable and Observer in RxJava. Understand how to subscribe to Observables, manage events like onNext, onComplete, and onError, and grasp the synchronous and push-based nature of RxJava streams.

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An Observable can emit any number of items. As mentioned, to receive or listen to these emitted items, an Observer needs to subscribe to the Observable. The .subscribe() method is defined by the ObservableSource interface, which is implemented by Observable.

Java
public interface ObservableSource<T> {
void subscribe(Observer<? super T> observer);
}

Once the Observable and Observer have been paired via the .subscribe() method, the Observer ...