Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #32735

parallel stream with return

Show all headers | View raw

Hello,

I'm new with the Java 1.8 parallel stream, so I have got a problem:

I have the sequential for loop:

final Set<myClass> x = new HashSet<>();
for(int i=0; i < value; ++i)
    x.add( this.generate() );

And I would like to do this with a parallel stream which collects each generate return value into the set.
My first try was to use a synchronized HashSet and

IntStream.range(0, value).parallel().forEach( i-> { x.add(this.generate()) } );

After that I try to swap forEach to map, but at this I must return an int value and not a myClass value, so how can I do n generate calls in parallel and collect the results into a hashset?

Thanks

Phil

Back to comp.lang.java.programmer | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

parallel stream with return Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2015-09-29 23:35 -0700
  Re: parallel stream with return Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-09-30 08:01 -0400
    Re: parallel stream with return Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2015-09-30 08:02 -0700
      Re: parallel stream with return Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-09-30 13:22 -0400
        Re: parallel stream with return Steven Simpson <ss@my.domain.invalid> - 2015-09-30 22:25 +0100
  Re: parallel stream with return Jeff Higgins <jeff@invalid.invalid> - 2015-09-30 16:41 -0400
    Re: parallel stream with return Jeff Higgins <jeff@invalid.invalid> - 2015-09-30 16:53 -0400
      Re: parallel stream with return Philipp Kraus <philipp.kraus.flashpixx@gmail.com> - 2015-09-30 23:36 -0700
        Re: parallel stream with return Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-10-01 08:22 -0400
        Re: parallel stream with return Jeff Higgins <jeff@invalid.invalid> - 2015-10-01 08:54 -0400

csiph-web