29 lines
738 B
Java
29 lines
738 B
Java
// streams/OptionalsFromEmptyStreams.java
|
|
import java.util.*;
|
|
import java.util.stream.*;
|
|
|
|
class OptionalsFromEmptyStreams {
|
|
public static void main(String[] args) {
|
|
System.out.println(Stream.<String>empty()
|
|
.findFirst());
|
|
System.out.println(Stream.<String>empty()
|
|
.findAny());
|
|
System.out.println(Stream.<String>empty()
|
|
.max(String.CASE_INSENSITIVE_ORDER));
|
|
System.out.println(Stream.<String>empty()
|
|
.min(String.CASE_INSENSITIVE_ORDER));
|
|
System.out.println(Stream.<String>empty()
|
|
.reduce((s1, s2) -> s1 + s2));
|
|
System.out.println(IntStream.empty()
|
|
.average());
|
|
}
|
|
}
|
|
/* Output:
|
|
Optional.empty
|
|
Optional.empty
|
|
Optional.empty
|
|
Optional.empty
|
|
Optional.empty
|
|
OptionalDouble.empty
|
|
*/
|