DoubleStream boxed() in Java with Examples

DoubleStream boxed() returns a Stream consisting of the elements of this stream, each boxed to a Double.

Note : DoubleStream boxed() 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 :

Stream<Double> boxed()

Parameters :

1. Stream : A sequence of elements supporting sequential and parallel aggregate operations.
2. Double : The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.

Return Value : The function returns a Stream boxed to a Double.

Example 1 :

// Java code for DoubleStream boxed()
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an DoubleStream
        DoubleStream stream = DoubleStream.of(3.2, 8.4, 3.6, 4.7);

        // Creating a Stream of Doubles
        // Using DoubleStream boxed() to return
        // a Stream consisting of the elements
        // of this stream, each boxed to a Double.
        Stream<Double> stream1 = stream.boxed();

        // Displaying the elements
        stream1.forEach(System.out::println);
    }
}

Output :

3.2
8.4
3.6
4.7

Example 2 :

// Java code for DoubleStream boxed()
import java.util.*;
import java.util.stream.Stream;
import java.util.stream.DoubleStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating an DoubleStream
        DoubleStream stream = DoubleStream.of(3.2, 8.4, 3.6, 4.7);

        // Creating a Stream of Doubles
        // Using DoubleStream boxed() to return
        // a Stream consisting of the elements
        // of this stream, each boxed to a Double.
        Stream<Double> stream1 = stream.boxed();

        Stream<Object> stream2 = Stream.concat(stream1,
                                   Stream.of("Geeks", "for", "Geeks"));

        // Displaying the elements
        stream2.forEach(System.out::println);
    }
}

Output :

3.2
8.4
3.6
4.7
Geeks
for
Geeks