E - the enum type of elements maintained by this set
Serializable, Cloneable, Iterable<E>, Collection<E>, Set<E>
A specialized
Set
implementation for use with enum types. All of the elements in an enum set must come from a single enum type that is specified, explicitly or implicitly, when the set is created. Enum sets are represented internally as bit vectors. This representation is extremely compact and efficient. The space and time performance of this class should be good enough to allow its use as a high-quality, typesafe alternative to traditional
int
-based "bit flags." Even bulk operations (such as
containsAll
and
retainAll
) should run very quickly if their argument is also an enum set.
The iterator returned by the iterator method traverses the elements in their natural order (the order in which the enum constants are declared). The returned iterator is weakly consistent: it will never throw ConcurrentModificationException and it may or may not show the effects of any modifications to the set that occur while the iteration is in progress.
Null elements are not permitted. Attempts to insert a null element will throw NullPointerException. Attempts to test for the presence of a null element or to remove one will, however, function properly.
Like most collection implementations, EnumSet is not synchronized. If multiple threads access an enum set concurrently, and at least one of the threads modifies the set, it should be synchronized externally. This is typically accomplished by synchronizing on some object that naturally encapsulates the enum set. If no such object exists, the set should be "wrapped" using the Collections.synchronizedSet(java.util.Set<T>) method. This is best done at creation time, to prevent accidental unsynchronized access:
Set<MyEnum> s = Collections.synchronizedSet(EnumSet.noneOf(MyEnum.class));
Implementation note: All basic operations execute in constant time. They are likely (though not guaranteed) to be much faster than their HashSet counterparts. Even bulk operations execute in constant time if their argument is also an enum set.
This class is a member of the Java Collections Framework.
Creates an enum set containing all of the elements in the specified element type.
Returns a copy of this set.
Creates an enum set with the same element type as the specified enum set, initially containing all the elements of this type that are not contained in the specified set.
Creates an enum set initialized from the specified collection.
Creates an enum set with the same element type as the specified enum set, initially containing the same elements (if any).
Creates an empty enum set with the specified element type.
Creates an enum set initially containing the specified element.
Creates an enum set initially containing the specified elements.
Creates an enum set initially containing the specified elements.
Creates an enum set initially containing the specified elements.
of(E e1, E e2, E e3, E e4)
Creates an enum set initially containing the specified elements.
of(E e1, E e2, E e3, E e4, E e5)
Creates an enum set initially containing the specified elements.
Creates an enum set initially containing all of the elements in the range defined by the two specified endpoints.
Methods declared in class java.util.AbstractCollectionadd, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, toArray, toArray, toString Methods declared in interface java.util.Setadd, addAll, clear, contains, containsAll, isEmpty, iterator, remove, retainAll, size, spliterator, toArray, toArrayCreates an empty enum set with the specified element type.
E - The class of the elements in the set
elementType - the class object of the element type for this enum set
NullPointerException - if elementType is null
Creates an enum set containing all of the elements in the specified element type.
E - The class of the elements in the set
elementType - the class object of the element type for this enum set
NullPointerException - if elementType is null
Creates an enum set with the same element type as the specified enum set, initially containing the same elements (if any).
E - The class of the elements in the set
s - the enum set from which to initialize this enum set
NullPointerException - if s is null
Creates an enum set initialized from the specified collection. If the specified collection is an
EnumSet
instance, this static factory method behaves identically to
copyOf(EnumSet)
. Otherwise, the specified collection must contain at least one element (in order to determine the new enum set's element type).
E - The class of the elements in the collection
c - the collection from which to initialize this enum set
IllegalArgumentException - if c is not an EnumSet instance and contains no elements
NullPointerException - if c is null
Creates an enum set with the same element type as the specified enum set, initially containing all the elements of this type that are not contained in the specified set.
E - The class of the elements in the enum set
s - the enum set from whose complement to initialize this enum set
NullPointerException - if s is null
Creates an enum set initially containing the specified element. Overloadings of this method exist to initialize an enum set with one through five elements. A sixth overloading is provided that uses the varargs feature. This overloading may be used to create an enum set initially containing an arbitrary number of elements, but is likely to run slower than the overloadings that do not use varargs.
E - The class of the specified element and of the set
e - the element that this set is to contain initially
NullPointerException - if e is null
Creates an enum set initially containing the specified elements. Overloadings of this method exist to initialize an enum set with one through five elements. A sixth overloading is provided that uses the varargs feature. This overloading may be used to create an enum set initially containing an arbitrary number of elements, but is likely to run slower than the overloadings that do not use varargs.
E - The class of the parameter elements and of the set
e1 - an element that this set is to contain initially
e2 - another element that this set is to contain initially
NullPointerException - if any parameters are null
Creates an enum set initially containing the specified elements. Overloadings of this method exist to initialize an enum set with one through five elements. A sixth overloading is provided that uses the varargs feature. This overloading may be used to create an enum set initially containing an arbitrary number of elements, but is likely to run slower than the overloadings that do not use varargs.
E - The class of the parameter elements and of the set
e1 - an element that this set is to contain initially
e2 - another element that this set is to contain initially
e3 - another element that this set is to contain initially
NullPointerException - if any parameters are null
Creates an enum set initially containing the specified elements. Overloadings of this method exist to initialize an enum set with one through five elements. A sixth overloading is provided that uses the varargs feature. This overloading may be used to create an enum set initially containing an arbitrary number of elements, but is likely to run slower than the overloadings that do not use varargs.
E - The class of the parameter elements and of the set
e1 - an element that this set is to contain initially
e2 - another element that this set is to contain initially
e3 - another element that this set is to contain initially
e4 - another element that this set is to contain initially
NullPointerException - if any parameters are null
Creates an enum set initially containing the specified elements. Overloadings of this method exist to initialize an enum set with one through five elements. A sixth overloading is provided that uses the varargs feature. This overloading may be used to create an enum set initially containing an arbitrary number of elements, but is likely to run slower than the overloadings that do not use varargs.
E - The class of the parameter elements and of the set
e1 - an element that this set is to contain initially
e2 - another element that this set is to contain initially
e3 - another element that this set is to contain initially
e4 - another element that this set is to contain initially
e5 - another element that this set is to contain initially
NullPointerException - if any parameters are null
Creates an enum set initially containing the specified elements. This factory, whose parameter list uses the varargs feature, may be used to create an enum set initially containing an arbitrary number of elements, but it is likely to run slower than the overloadings that do not use varargs.
E - The class of the parameter elements and of the set
first - an element that the set is to contain initially
rest - the remaining elements the set is to contain initially
NullPointerException - if any of the specified elements are null, or if rest is null
Creates an enum set initially containing all of the elements in the range defined by the two specified endpoints. The returned set will contain the endpoints themselves, which may be identical but must not be out of order.
E - The class of the parameter elements and of the set
from - the first element in the range
to - the last element in the range
NullPointerException - if from or to are null
IllegalArgumentException - if from.compareTo(to) > 0
Returns a copy of this set.
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