DoubleStream sequential() in Java

DoubleStream sequential() returns a sequential DoubleStream. It may return itself, either because the stream was already sequential, or because the underlying stream state was modified to be sequential.

DoubleStream sequential() is an intermediate operation. Intermediate operations are invoked on a Stream instance and after they finish their processing, they give a Stream instance as output.

Syntax :

DoubleStream sequential()

Where, DoubleStream is a sequence of primitive
double-valued element.

Return Value : A sequential DoubleStream.
Example 1 : DoubleStream sequential() to return a sequential DoubleStream.

// Java code for DoubleStream sequential()
// to return a sequential DoubleStream.
import java.util.*;
import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an DoubleStream
        DoubleStream stream = DoubleStream.of(3.3, 5.4, 9.2,
                                              12.1, 14.4);

        // Using DoubleStream sequential()
        DoubleStream streamNew = stream.sequential();

        // Displaying sequential DoubleStream
        streamNew.forEach(System.out::println);
    }
}

Output:

3.3
5.4
9.2
12.1
14.4

Example 2 : DoubleStream sequential() on empty DoubleStream.

// Java code for DoubleStream sequential()
// on empty DoubleStream
import java.util.*;
import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an empty DoubleStream
        DoubleStream stream = DoubleStream.empty();

        // To check if it is parallel or not
        System.out.println("parallel : " + stream.isParallel());

        stream = stream.parallel();

        // To check if it is parallel or not
        System.out.println("parallel : " + stream.isParallel());

        stream = stream.sequential();

        // To check if it is parallel or not
        System.out.println("parallel : " + stream.isParallel());
    }
}

Output:

parallel : false
parallel : true
parallel : false