java.lang.Object | ||
↳ | java.util.AbstractMap<K, V> | |
↳ | java.util.EnumMap<K extends java.lang.Enum<K>, V> |
An Map
specialized for use with Enum
types as keys.
Public Constructors | |||||||||||
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Constructs an empty
EnumMap using the given key type.
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Constructs an
EnumMap using the same key type as the given EnumMap and
initially containing the same mappings.
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Constructs an
EnumMap initialized from the given map.
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Public Methods | |||||||||||
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Removes all elements from this
EnumMap , leaving it empty.
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Returns a shallow copy of this
EnumMap .
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Returns whether this
EnumMap contains the specified key.
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Returns whether this
EnumMap contains the specified value.
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Returns a
Set containing all of the mappings in this EnumMap .
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Compares the argument to the receiver, and returns
true if the
specified Object is an EnumMap and both EnumMap s contain the same mappings.
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Returns the value of the mapping with the specified key.
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Returns a set of the keys contained in this
EnumMap .
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Maps the specified key to the specified value.
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Copies every mapping in the specified
Map to this EnumMap .
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Removes a mapping with the specified key from this
EnumMap .
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Returns the number of elements in this
EnumMap .
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Returns a
Collection of the values contained in this EnumMap .
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Inherited Methods | |||||||||||
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Constructs an empty EnumMap
using the given key type.
keyType | the class object giving the type of the keys used by this EnumMap . |
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NullPointerException | if keyType is null .
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Constructs an EnumMap
using the same key type as the given EnumMap
and
initially containing the same mappings.
map | the EnumMap from which this EnumMap is initialized. |
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NullPointerException | if map is null .
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Constructs an EnumMap
initialized from the given map. If the given map
is an EnumMap
instance, this constructor behaves in the exactly the same
way as EnumMap(EnumMap)
}. Otherwise, the given map
should contain at least one mapping.
map | the map from which this EnumMap is initialized. |
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IllegalArgumentException | if map is not an EnumMap instance and does not contain
any mappings. |
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NullPointerException | if map is null .
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Returns a shallow copy of this EnumMap
.
EnumMap
.
Returns whether this EnumMap
contains the specified key.
key | the key to search for. |
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true
if this EnumMap
contains the specified key,
false
otherwise.
Returns whether this EnumMap
contains the specified value.
value | the value to search for. |
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true
if this EnumMap
contains the specified value,
false
otherwise.
Returns a Set
containing all of the mappings in this EnumMap
. Each mapping is
an instance of Map.Entry
. As the Set
is backed by this EnumMap
,
changes in one will be reflected in the other.
The order of the entries in the set will be the order that the enum keys were declared in.
Set
of the mappings.
Compares the argument to the receiver, and returns true
if the
specified Object
is an EnumMap
and both EnumMap
s contain the same mappings.
object | the Object to compare with this EnumMap . |
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true
if object
is the same as this EnumMap
,
false
otherwise.Returns the value of the mapping with the specified key.
key | the key. |
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null
if no mapping for the specified key is found.
Returns a set of the keys contained in this EnumMap
. The Set
is backed by
this EnumMap
so changes to one are reflected in the other. The Set
does not
support adding.
The order of the set will be the order that the enum keys were declared in.
Set
of the keys.
Maps the specified key to the specified value.
key | the key. |
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value | the value. |
null
if there was no mapping.UnsupportedOperationException | if adding to this map is not supported. |
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ClassCastException | if the class of the key or value is inappropriate for this map. |
IllegalArgumentException | if the key or value cannot be added to this map. |
NullPointerException | if the key or value is null and this EnumMap does not
support null keys or values.
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Copies every mapping in the specified Map
to this EnumMap
.
map | the Map to copy mappings from. |
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UnsupportedOperationException | if adding to this EnumMap is not supported. |
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ClassCastException | if the class of a key or value is inappropriate for this
EnumMap . |
IllegalArgumentException | if a key or value cannot be added to this map. |
NullPointerException | if a key or value is null and this EnumMap does not
support null keys or values.
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Removes a mapping with the specified key from this EnumMap
.
key | the key of the mapping to remove. |
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null
if no mapping
for the specified key was found.UnsupportedOperationException | if removing from this EnumMap is not supported.
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Returns the number of elements in this EnumMap
.
EnumMap
.
Returns a Collection
of the values contained in this EnumMap
. The returned
Collection
complies with the general rule specified in
values()
. The Collection
's Iterator
will return the values
in the their corresponding keys' natural order (the Enum
constants are
declared in this order).
The order of the values in the collection will be the order that their corresponding enum keys were declared in.
EnumMap
.