接口 Predicate

所有超级接口:
Expression<Boolean>, Selection<Boolean>
所有已知子接口:
PredicateImplementor, VirtualPredicate
所有已知实现类:
AbstractPredicate, AssociatedPredicate, CompositePredicate, ExistsPredicate, NotPredicate, VirtualPredicateMergedResult

public interface Predicate extends Expression<Boolean>