infinite streams

[Luc Duponcheel]

fair enough ...

frankly I was hoping for Haskell and/or Scala functionality like takeWhile

btw:
thanks so much for the quick reply!

Luc



On Fri, Mar 15, 2013 at 5:54 PM, Brian Goetz <brian.goetz at oracle.com> wrote:

> In cases like this, you probably want to use an Iterator instead.
> Iterators are expected to be stateful in this way.
>
>
> On 3/15/2013 12:40 PM, Luc Duponcheel wrote:
>
>> Hello all,
>>
>> just by looking at the API's I came up with the
>> following program (see below) for generating/printing
>> fibonacci numbers [ agreed: not very original :-) ]
>>
>> the code works fine, but, my question is:
>> the BooleanSupplier cannot make use of the current
>> fibonacci number (e.g. I want to stop printing when
>> the fibonacci number is greater than, say, 1000)
>>
>> ps:
>>
>> my code is not the most "functional" one can think of
>> [ it uses two mutable variables (i and j) ]
>>
>> any alternative approaches?
>>
>> thx
>>
>> === begin code ===
>>
>> package whatever
>>
>> import java.util.function.Supplier;
>> import java.util.stream.Stream;
>> import java.util.stream.Streams;
>>
>> public class FibApp {
>>
>>   public static void main(String[] args) {
>>    Stream<Integer> fibs =
>>            Streams.generate(
>>            new Supplier<Integer>() {
>>     private int i = 1;
>>     private int j = 1;
>>
>>     @Override
>>     public Integer get() {
>>      Integer result = new Integer(i);
>>      int tmp = i;
>>      i = j;
>>      j = j + tmp;
>>      return result;
>>     }
>>    });
>>    fibs.forEachUntil(n -> {
>>     System.out.print(n + " ");
>>    }, () -> Math.random() < 0.1);
>>    System.out.println();
>>   }
>> }
>>
>> === end code ===
>>
>> Luc
>>
>>


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