// concurrent/ParallelStreamPuzzle.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

import java.util.function.*;

import java.util.stream.*;

public class ParallelStreamPuzzle {

static class IntGenerator

implements Supplier<Integer> {

private int current = 0;

@Override public Integer get() {

return current++;

}

}

public static void main(String[] args) {

List<Integer> x =

Stream.generate(new IntGenerator())

.limit(10)

.parallel() // [1]

.collect(Collectors.toList());

System.out.println(x);

}

}

/* Output:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

*/