This interface represents an unordered
Collection of objects that contains no duplicate
elements. That is, a Set cannot contain two
elements e1 and e2 where
e1.equals(e2), and it can contain at most one
null element. The Set interface
defines the same methods as its superinterface,
Collection. It constrains the add(
) and addAll( ) methods from adding
duplicate elements to the Set. In Java 5.0
Set is a generic interface and the type variable
E represents the type of the objects in
the set.
An interface cannot specify constructors, but it is conventional that
all implementations of Set provide at least two
standard constructors: one that takes no arguments and creates an
empty set, and a copy constructor that accepts a
Collection object that specifies the initial
contents of the new Set. This copy constructor
must ensure that duplicate elements are not added to the
Set, of course.
As with Collection, the Set
methods that modify the contents of the set are optional, and
implementations that do not support the methods throw
java.lang.UnsupportedOperationException. See also
Collection, List,
Map, SortedSet,
HashSet, and TReeSet.
public interface Set<E> extends Collection<E> {
// Public Instance Methods
boolean add(E o);
boolean addAll(Collection<? extends E> c);
void clear( );
boolean contains(Object o);
boolean containsAll(Collection<?> c);
boolean equals(Object o);
int hashCode( );
boolean isEmpty( );
Iterator<E> iterator( );
boolean remove(Object o);
boolean removeAll(Collection<?> c);
boolean retainAll(Collection<?> c);
int size( );
Object[ ] toArray( );
<T> T[ ] toArray(T[ ] a);
}
Implementations
AbstractSet, HashSet,
LinkedHashSet, SortedSet
Passed To
java.security.cert.PKIXBuilderParameters.PKIXBuilderParameters(
),
java.security.cert.PKIXParameters.{PKIXParameters(
), setInitialPolicies( ),
setTrustAnchors( )},
java.security.cert.X509CertSelector.{setExtendedKeyUsage(
), setPolicy( )},
java.text.AttributedCharacterIterator.{getRunLimit(
), getrunStart( )},
Collections.{checkedSet( ),
synchronizedSet( ), unmodifiableSet(
)}, javax.security.auth.Subject.Subject(
)
Returned By
Too many methods to list.
Type Of
Collections.EMPTY_SET
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