Java 8 Stream, getting head and tail

Question

Java 8 introduced a Stream class that resembles Scala\'s Stream, a powerful lazy construct using which it is possible to do something like this very concisely:

Answer 1

Here is another recipe using the way suggested by Holger. It use RxJava just to add the possibility to use the take(int) method and many others.

package com.company;

import rx.Observable;

import java.util.function.IntPredicate;
import java.util.stream.IntStream;

public class Main {

    public static void main(String[] args) {

        final IntPredicate[] p={(x)->true};
        IntStream primesStream=IntStream.iterate(2,n->n+1).filter(i -> p[0].test(i)).peek(i->p[0]=p[0].and(v->v%i!=0)   );

        Observable primes = Observable.from(()->primesStream.iterator());

        primes.take(10).forEach((x) -> System.out.println(x.toString()));


    }

}