OptionalDouble stream() method in Java with examples

The stream() method help us to get double value contain by OptionalDouble as DoubleStream.If a value is present, method returns a sequential DoubleStream containing only that value, otherwise returns an empty DoubleStream.

Syntax:

public DoubleStream stream()

Parameters: This method accepts nothing.

Return value: This method returns the optional value as an DoubleStream.

Below programs illustrate stream() method:
Program 1:

// Java program to demonstrate 
// OptionalDouble.stream() method 
  
import java.util.OptionalDouble; 
import java.util.stream.DoubleStream; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // create a OptionalDouble 
        OptionalDouble opDouble 
            = OptionalDouble.of(.3203); 
  
        // get value as stream 
        DoubleStream out = opDouble.stream(); 
  
        // print value 
        System.out.print("Value: "); 
        out.forEach(System.out::print); 
    } 
} 

Output:

Program 2:

// Java program to demonstrate 
// OptionalDouble.stream() method 
  
import java.util.OptionalDouble; 
import java.util.stream.DoubleStream; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // create a empty OptionalDouble 
        OptionalDouble opDouble 
            = OptionalDouble.empty(); 
  
        // get value as stream 
        DoubleStream out = opDouble.stream(); 
  
        // print value 
        System.out.print("length of Double Stream: "
                         + out.count()); 
    } 
} 

Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#empty()

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