Java Streams - IntStream mapToLong(IntToLongFunction mapper) example

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IntStream mapToLong(IntToLongFunction mapper) returns a LongStream consisting of the results of applying the given function. This is an intermediate operation.

Syntax

mapToLong has the following syntax.

LongStream mapToLong(IntToLongFunction mapper)

Example

The following example shows how to use mapToLong.

import java.util.stream.IntStream;
import java.util.stream.LongStream;
/*from  ww  w  . ja v a 2  s  .c o m*/
public class Main {
  public static void main(String[] args) {
    IntStream i = IntStream.of(6,5,7,1, 2, 3, 3);
    LongStream d = i.mapToLong(n ->{ return (long)n;});
    d.forEach(System.out::println);
  }
}

The code above generates the following result.

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