I came across RxJava for android and it's a good library. Class Declaration. Following is the declaration for io.reactivex.subjects.BehaviorSubject class − public final class BehaviorSubject extends Subject BehaviorSubject Example But we'll be discussing only a few operators that are commonly used for converting synchronous or asynchronous methods into Observables based on their nature.These operators take functions as arguments and emit the value returned from that function. Else if the scope of your observable is a type (e.g., it's exposed as a public property and backed by a field): If you need to define a similar event or a similar event already exists, then convert the event into an observable like the first case. In RxJava, the from operator can convert a Future, an Iterable, or an Array. To transform an Observable into a BlockingObservable, use the Observable.toBlocking( ) method or the BlockingObservable.from( ) method. Observer: Assume that a student is an observer. timer returns an Observable that emits a single number zero after a delay period you specify. The student observes the topic being taught by the professor. Here instead of saving value to be emitted, we store current index called count.And when count reaches requested index we dispose upstream and complete with success downstream single. timer by default operates on the computation Scheduler , or you can override this by passing in a Scheduler as a final parameter. BehaviorSubject emits the most recent item it has observed and then all subsequent observed items to each subscribed Observer. Don't use subjects. I'm a beginner and i understand how it works but i have some trouble converting my old codes to RxJava style programming. RxJava2 defines a whole lot of operators for various use cases of reactive programming.. Publish Subject. val justObservable = Observable.just(4, 5, 6, null) Remember that if you pass null to Just, it will return an Observable that emits null as an item. It emits all the subsequent items of the source Observable at the time of subscription. This function takes as a parameter the ConnectableObservable that shares a single subscription to the underlying Observable sequence. Observable: Assume that a professor is observable. In the case of an Iterable or an Array, the resulting Observable will emit each item contained in the Iterable or Array. Similar to how toBlocking().single() and others return T this is about extracting values from an Observable to a new type asynchronously, correct?. So that means that elementAt-like operators don’t wait for upstream to complete and are more like eager version of transforming Observable to Single. This function produces and returns a new Observable sequence. 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