AbstractMap.SimpleImmutableEntry
public
static
class
AbstractMap.SimpleImmutableEntry
extends Object
implements
Entry<K, V>,
Serializable
java.lang.Object | |
↳ | java.util.AbstractMap.SimpleImmutableEntry<K, V> |
An unmodifiable Entry maintaining a key and a value. This class
does not support the setValue
method. Instances of
this class are not associated with any map nor with any map's
entry-set view.
Summary
Public constructors | |
---|---|
SimpleImmutableEntry(K key, V value)
Creates an entry representing a mapping from the specified key to the specified value. |
|
SimpleImmutableEntry(Entry<? extends K, ? extends V> entry)
Creates an entry representing the same mapping as the specified entry. |
Public methods | |
---|---|
boolean
|
equals(Object o)
Compares the specified object with this entry for equality. |
K
|
getKey()
Returns the key corresponding to this entry. |
V
|
getValue()
Returns the value corresponding to this entry. |
int
|
hashCode()
Returns the hash code value for this map entry. |
V
|
setValue(V value)
Replaces the value corresponding to this entry with the specified value (optional operation). |
String
|
toString()
Returns a String representation of this map entry. |
Inherited methods | |
---|---|
Public constructors
SimpleImmutableEntry
public SimpleImmutableEntry (K key, V value)
Creates an entry representing a mapping from the specified key to the specified value.
Parameters | |
---|---|
key |
K : the key represented by this entry |
value |
V : the value represented by this entry |
SimpleImmutableEntry
public SimpleImmutableEntry (Entry<? extends K, ? extends V> entry)
Creates an entry representing the same mapping as the specified entry.
Parameters | |
---|---|
entry |
Entry : the entry to copy |
Public methods
equals
public boolean equals (Object o)
Compares the specified object with this entry for equality.
Returns true
if the given object is also a map entry and
the two entries represent the same mapping. More formally, two
entries e1
and e2
represent the same mapping
if
(e1.getKey()==null ? e2.getKey()==null : e1.getKey().equals(e2.getKey())) && (e1.getValue()==null ? e2.getValue()==null : e1.getValue().equals(e2.getValue()))This ensures that the
equals
method works properly across
different implementations of the Map.Entry
interface.
Parameters | |
---|---|
o |
Object : object to be compared for equality with this map entry |
Returns | |
---|---|
boolean |
true if the specified object is equal to this map
entry |
See also:
getKey
public K getKey ()
Returns the key corresponding to this entry.
Returns | |
---|---|
K |
the key corresponding to this entry |
getValue
public V getValue ()
Returns the value corresponding to this entry.
Returns | |
---|---|
V |
the value corresponding to this entry |
hashCode
public int hashCode ()
Returns the hash code value for this map entry. The hash code
of a map entry e
is defined to be:
(e.getKey()==null ? 0 : e.getKey().hashCode()) ^ (e.getValue()==null ? 0 : e.getValue().hashCode())This ensures that
e1.equals(e2)
implies that
e1.hashCode()==e2.hashCode()
for any two Entries
e1
and e2
, as required by the general
contract of Object#hashCode
.
Returns | |
---|---|
int |
the hash code value for this map entry |
See also:
setValue
public V setValue (V value)
Replaces the value corresponding to this entry with the specified
value (optional operation). This implementation simply throws
UnsupportedOperationException
, as this class implements
an unmodifiable map entry.
Implementation Requirements:
- The implementation in this class always throws
UnsupportedOperationException
.
Parameters | |
---|---|
value |
V : new value to be stored in this entry |
Returns | |
---|---|
V |
(Does not return) |
Throws | |
---|---|
UnsupportedOperationException |
always |
toString
public String toString ()
Returns a String representation of this map entry. This
implementation returns the string representation of this
entry's key followed by the equals character ("=
")
followed by the string representation of this entry's value.
Returns | |
---|---|
String |
a String representation of this map entry |