IntStream findAny() with examples
Last Updated :
06 Dec, 2018
IntStream findAny() returns an OptionalInt (a container object which may or may not contain a non-null value) describing some element of the stream, or an empty OptionalInt if the stream is empty.
Syntax :
OptionalInt findAny()
Where, OptionalInt is a container object which
may or may not contain a non-null value
and the function returns an OptionalInt describing some element of
this stream, or an empty OptionalInt 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 Integer Stream.
import java.util.*;
import java.util.stream.IntStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.of( 6 , 7 , 8 , 9 );
OptionalInt answer = stream.findAny();
if (answer.isPresent()) {
System.out.println(answer.getAsInt());
}
else {
System.out.println( "no value" );
}
}
}
|
Output :
6
Note : The behavior of IntStream 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.
import java.util.OptionalInt;
import java.util.stream.IntStream;
class GFG {
public static void main(String[] args)
{
IntStream stream = IntStream.of( 4 , 5 , 8 , 10 , 12 , 16 )
.parallel();
stream = stream.filter(num -> num % 4 == 0 );
OptionalInt answer = stream.findAny();
if (answer.isPresent()) {
System.out.println(answer.getAsInt());
}
}
}
|
Output :
16
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