@GwtCompatible public interface Predicate<T>
The Predicates class provides common predicates and related utilities.
 
See the Guava User Guide article on the use of Predicate.
boolean apply(@Nullable T input)
input. This method is generally
 expected, but not absolutely required, to have the following properties:
 Objects.equal(a, b) implies that predicate.apply(a) ==
     predicate.apply(b)).
 NullPointerException - if input is null and this predicate does not accept null
     argumentsboolean equals(@Nullable Object object)
Most implementations will have no reason to override the behavior of Object.equals(java.lang.Object).
 However, an implementation may also choose to return true whenever object is a
 Predicate that it considers interchangeable with this one. "Interchangeable"
 typically means that this.apply(t) == that.apply(t) for all t of type
 T). Note that a false result from this method does not imply that the
 predicates are known not to be interchangeable.
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