public final class Unknown extends java.lang.Object
 Used in special matching methods to ignore a value.
 Note that this break the commutativity property of equals, and thus this object must be
 used with caution.
| Modifier and Type | Method and Description | 
|---|---|
boolean | 
equals(java.lang.Object o)  | 
static Unknown | 
get()  | 
int | 
hashCode()  |