RxJava2

Question 1

Flowable

Answer 1

The Flowable class that implements the Reactive-Streams Pattern (Publisher) and offers factory methods, intermediate operators and the ability to consume reactive dataflows.

Question 2

Observable

Answer 2

The Observable class is the non-backpressured, optionally multi-valued base reactive class that offers factory methods, intermediate operators and the ability to consume synchronous and/or asynchronous reactive dataflows

Question 3

Subject

Answer 3

Represents an Observer and an Observable at the same time, allowing multicasting events from a single source to multiple child Observers.

Question 4

Observer

Answer 4

Provides a mechanism for receiving push-based notifications.

Question 5

Disposable

Answer 5

Represents a disposable resource.

Question 6

Processor

Answer 6

A Processor represents a processing stage—which is both a Subscriber and a Publisher and obeys the contracts of both. (Like Subject, but conforming to the Reactive Streams spec it has backpressure support)

Question 7

ParallelFlowable

Answer 7

Abstract base class for Parallel publishers that take an array of Subscribers.

Question 8

Completable

Answer 8

Represents a deferred computation without any value but only indication for completion or error (onSubscribe, onComplete and onError).
Similar to Single, but does not return any value.

Question 9

RxJavaPlugins

Answer 9

Utility class to inject handlers to certain standard RxJava operations.

Question 10

Single

Answer 10

Observable which returns single result or error and then finishes (onSuccess and onError)

Question 11

Maybe

Answer 11

It is a union of Single and Completable providing the means to capture an emission pattern where there could be 0 or 1 item or an error signalled by some reactive source.

Question 12

ObservableSource

Answer 12

Basic interface, inherited by Observable class.

Has only one subscribe(Observer super T> observer) function.