



DoubleStream mapToObj() in Java


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



Related Articles :

IntStream mapToObj() in Java
Stream map() in Java with examples
LongStream mapToObj() in Java






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