K
- the type of the keysV
- the type of the valueSerializable
, Map.Entry<K,V>
AbstractMap<K,V>
public static class AbstractMap.SimpleImmutableEntry<K,V> extends Object implements Map.Entry<K,V>, Serializable
setValue
method. Instances of this class are not associated with any map nor with any map's entry-set view. This class may be convenient in methods that return thread-safe snapshots of key-value mappings. For alternatives, see the Map::entry
and Map.Entry::copyOf
methods.
Constructor | Description |
---|---|
SimpleImmutableEntry |
Creates an entry representing the same mapping as the specified entry. |
SimpleImmutableEntry |
Creates an entry representing a mapping from the specified key to the specified value. |
Modifier and Type | Method | Description |
---|---|---|
boolean |
equals |
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 |
Replaces the value corresponding to this entry with the specified value (optional operation). |
String |
toString() |
Returns a String representation of this map entry. |
public SimpleImmutableEntry(K key, V value)
key
- the key represented by this entryvalue
- the value represented by this entrypublic SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)
entry
- the entry to copypublic K getKey()
public V getValue()
public V setValue(V value)
UnsupportedOperationException
, as this class implements an unmodifiable map entry.setValue
in interface Map.Entry<K,V>
UnsupportedOperationException
.value
- new value to be stored in this entryUnsupportedOperationException
- alwayspublic boolean equals(Object o)
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.public int hashCode()
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()
.public String toString()
=
") followed by the string representation of this entry's value.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/AbstractMap.SimpleImmutableEntry.html