- All Known Implementing Classes:
@GwtCompatible public interface Predicate<T>Determines a true or false value for a given input.
Predicatesclass provides common predicates and related utilities.
See the Guava User Guide article on the use of
- 2.0 (imported from Google Collections Library)
applyReturns the result of applying this predicate to
input. This method is generally expected, but not absolutely required, to have the following properties:
- Its execution does not cause any observable side effects.
- The computation is consistent with equals; that is,
(a, b)implies that
predicate.apply(a) == predicate.apply(b)).
inputis null and this predicate does not accept null arguments
equalsIndicates whether another object is equal to this predicate.
Most implementations will have no reason to override the behavior of
Object.equals(java.lang.Object). However, an implementation may also choose to return
Predicatethat it considers interchangeable with this one. "Interchangeable" typically means that
this.apply(t) == that.apply(t)for all
T). Note that a
falseresult from this method does not imply that the predicates are known not to be interchangeable.