IntStream mapToDouble() in Java
Last Updated :
06 Dec, 2018
IntStream mapToDouble() returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.
Note : IntStream mapToDouble() is a intermediate operation. These operations are always lazy. Intermediate operations are invoked on a Stream instance and after they finish their processing, they give a Stream instance as output.
Syntax :
DoubleStream mapToDouble(IntToDoubleFunction mapper)
Parameters :
- DoubleStream : A sequence of primitive double-valued elements. This is the double primitive specialization of Stream.
- mapper : A stateless function to apply to each element.
Return Value : The function returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.
Example 1 :
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.of( 2 , 4 , 6 , 8 , 10 );
DoubleStream stream1 = stream.mapToDouble(num -> ( double )num);
stream1.forEach(System.out::println);
}
}
|
Output :
2.0
4.0
6.0
8.0
10.0
Example 2 :
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.range( 5 , 10 );
DoubleStream stream1 = stream.mapToDouble(num -> ( double )num / 3 );
stream1.forEach(System.out::println);
}
}
|
Output :
1.6666666666666667
2.0
2.3333333333333335
2.6666666666666665
3.0
Example 3 :
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.DoubleStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.range( 5 , 10 );
DoubleStream stream1 = stream.mapToDouble(Math::sin);
stream1.forEach(System.out::println);
}
}
|
Output :
-0.9589242746631385
-0.27941549819892586
0.6569865987187891
0.9893582466233818
0.4121184852417566
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