abstract class Optional<T>
extends java.lang.Object
Modifier and Type | Class and Description |
---|---|
static class |
Optional.Some<T> |
Modifier and Type | Field and Description |
---|---|
private static Optional<java.lang.Object> |
NONE |
Constructor and Description |
---|
Optional() |
Modifier and Type | Method and Description |
---|---|
static <T> Optional<T> |
empty() |
abstract T |
get() |
boolean |
isDefined() |
abstract boolean |
isEmpty() |
static <T> Optional<T> |
of(T it) |
java.lang.String |
toString() |
private static final Optional<java.lang.Object> NONE