DoubleStream findAny() returns an OptionalDouble (a container object which may or may not contain a non-null value) describing some element of the stream, or an empty OptionalDouble if the stream is empty.
Syntax :
OptionalDouble findAny()
Parameters :
- OptionalDouble : A container object which may or may not contain a non-null value.
Return Value : The function returns an OptionalDouble describing some element of this stream, or an empty OptionalDouble if the stream is empty.
Note : findAny() is a terminal-short-circuiting operation of Stream interface. This method returns any first element satisfying the intermediate operations. This is a short-circuit operation because it just needs ‘any’ first element to be returned and terminate the rest of the iteration.
Example 1 : findAny() method on Double Stream.
// Java code for DoubleStream findAny()// which returns an OptionalDouble describing// some element of the stream, or an// empty OptionalDouble if the stream is empty.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(6.3, 7.4, 8.5, 9.6);          // Using DoubleStream findAny() to return        // an OptionalDouble describing some element        // of the stream        OptionalDouble answer = stream.findAny();          // if the stream is empty, an empty        // OptionalDouble is returned.        if (answer.isPresent()) {            System.out.println(answer.getAsDouble());        }        else {            System.out.println("no value");        }    }} |
Output :
6.3
Note : The behavior of DoubleStream findAny() operation is explicitly non-deterministic i.e, it is free to select any element in the stream. Multiple invocations on the same source may not return the same result.
Example 2 : findAny() method to return the elements divisible by 4, in a non-deterministic way.
// Java code for DoubleStream findAny()// which returns an OptionalDouble describing// some element of the stream, or an// empty OptionalDouble if the stream is empty.import java.util.OptionalDouble;import java.util.stream.DoubleStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating an DoubleStream        DoubleStream stream = DoubleStream.of(4.4, 5.6,                    8.4, 10.2, 12.0, 16.0).parallel();          // Using DoubleStream findAny().        // Executing the source code multiple times        // may not return the same result.        // Every time you may get a different        // Double value which is divisible by 4.        stream = stream.filter(num -> num % 4 == 0);          OptionalDouble answer = stream.findAny();        if (answer.isPresent()) {            System.out.println(answer.getAsDouble());        }    }} |
Output :
16.0
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