Java Streams - LongStream collect(Supplier supplier, ObjLongConsumer accumulator, BiConsumer combiner) example

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LongStream collect(Supplier<R> supplier, ObjLongConsumer<R> accumulator, BiConsumer<R,R> combiner) performs a mutable reduction operation on the elements of this stream.

Syntax

collect has the following syntax.

<R> R collect(Supplier<R> supplier,  ObjLongConsumer<R> accumulator,  BiConsumer<R,R> combiner)

Example

The following example shows how to use collect.

import java.util.ArrayList;
import java.util.List;
import java.util.stream.LongStream;
/*from ww w. java  2 s  . c o m*/
public class Main {
  public static void main(String[] args) {
    LongStream b = LongStream.of(1L, 2L, 3L, 4L);
    
    List<Long> v = b.collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
    
    System.out.println(v);
  }
}

The code above generates the following result.

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