| Defines a functor interface implemented by classes that perform a predicate
test on an object.
A Predicate is the object equivalent of an if statement.
It uses the input object to return a true or false value, and is often used in
validation or filtering.
Standard implementations of common predicates are provided by
PredicateUtils . These include true, false, instanceof, equals, and,
or, not, method invokation and null testing.
since:
Commons Collections 1.0
version:
$Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
author:
James Strachan
author:
Stephen Colebourne |