The Observable.merge() operator will take two or more Observable<T> sources emitting the same type T and then consolidate them into a single Observable<T>.
If we have only two to four Observable<T> sources to merge, you can pass each one as an argument to the Observable.merge() factory. In the following code snippet, I have merged two Observable<String> instances into one Observable<String>:
import io.reactivex.Observable;public class Launcher { public static void main(String[] args) { Observable<String> source1 = Observable.just("Alpha", "Beta", "Gamma", "Delta", "Epsilon"); Observable<String> source2 = Observable.just("Zeta", "Eta", "Theta"); Observable.merge(source1, source2) .subscribe(i -> System.
