@GwtCompatible public interface Predicate<T>
Predicates class provides common predicates and related utilities.
See the Guava User Guide article on the use of
This interface is now a legacy type. Use
java.util.function.Predicate (or the
appropriate primitive specialization such as
IntPredicate) instead whenever possible.
Otherwise, at least reduce explicit dependencies on this type by using lambda expressions
or method references instead of classes, leaving your code easier to migrate in the future.
To use a reference of this type (say, named
guavaPredicate) in a context where
java.util.function.Predicate is expected, use the method reference
guavaPredicate::apply. For the other direction, use
javaUtilPredicate::test. A future
version of this interface will be made to extend
that conversion will be necessary in only one direction. At that time, this interface will be
|Modifier and Type||Method and Description|
Returns the result of applying this predicate to
Indicates whether another object is equal to this predicate.
@CanIgnoreReturnValue boolean apply(@NullableDecl T input)
input(Java 8 users, see notes in the class documentation above). This method is generally expected, but not absolutely required, to have the following properties:
(a, b)implies that
predicate.apply(a) == predicate.apply(b)).
inputis null and this predicate does not accept null arguments
boolean equals(@NullableDecl Object object)
Most implementations will have no reason to override the behavior of
However, an implementation may also choose to return
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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