Learning RxJava - Second Edition

toSortedList()

A different flavor of toList() operator is toSortedList(). It collects the emitted values into a List object that has the elements sorted in a natural order (based on their Comparable implementation). Then, it pushes that List<T> object with sorted elements into the Observer:

import io.reactivex.rxjava3.core.Observable;public class Ch3_33 {    public static void main(String[] args) {        Observable.just("Beta", "Gamma", "Alpha")                .toSortedList()                .subscribe(s -> System.out.println("Received: " + s));    }}

The output of the preceding code snippet is as follows:

Received: [Alpha, Beta, Gamma]

As with the sorted() operator, you can provide a Comparator as an argument to apply a different sorting logic. You can also specify an initial capacity ...