DoubleStream mapToObj() returns an object-valued Stream consisting of the results of applying the given function.
Syntax:
<U> Stream<U> mapToObj(DoubleFunction<? extends U> mapper)
Parameters: This method accepts following parameters:
- U: The element type of the new stream.
- Stream : A sequence of elements supporting sequential and parallel aggregate operations.
- DoubleFunction : Represents a function that accepts an double-valued argument and produces a result.
- mapper : A stateless function to apply to each element.
Return Value: The function returns an object-valued Stream consisting of the results of applying the given function.
Below examples illustrate the mapToObj() method:
Example 1 :
// Java code for DoubleStream mapToObj// (DoubleFunction mapper)  import java.util.*;import java.util.stream.Stream;import java.util.stream.DoubleStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating a DoubleStream         DoubleStream stream = DoubleStream.of(3.4, 4.5,                                               6.7, 8.9);          // Using DoubleStream mapToObj(DoubleFunction mapper)        // and displaying an object-valued Stream         // consisting of the results of         // applying the given function        stream.mapToObj(num ->{return num * num * num ;})                           .forEach(System.out::println);      }} |
Output:
39.303999999999995 91.125 300.76300000000003 704.969
Example 2 :
// Java code for DoubleStream mapToObj// (DoubleFunction mapper)  import java.util.*;import java.math.BigDecimal;import java.util.stream.Stream;import java.util.stream.DoubleStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating a DoubleStream         DoubleStream stream = DoubleStream.of(3.4, 4.5,                                               6.7, 8.9);                  // Creating a Stream         // Using DoubleStream mapToObj(DoubleFunction mapper)        Stream<BigDecimal> stream1 = stream            .mapToObj(BigDecimal::valueOf);                              // Displaying an object-valued Stream         // consisting of the results of         // applying the given function.        stream1.forEach(num -> System.out.println                    (num.add(BigDecimal.TEN)));    }} |
Output:
13.4 14.5 16.7 18.9
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