Transforming Operator scan RxJava

RxTransformingOperatorScan.java

public class RxTransformingOperatorScan {
    public static void main(String[] args) {
        Observable.just(1, 2, 3, 4, 5)
                .scan((resultObserverPrevious, item) -> {
                    System.out.println("x: " + resultObserverPrevious + " & y: " + item);
                    return resultObserverPrevious + item;
                })
                .subscribe(System.out::println);
    }
}