Serializable
, Map.Entry<K,V>
public static class AbstractMap.SimpleEntry<K,V> extends Object implements Map.Entry<K,V>, Serializable
setValue
method. This class
facilitates the process of building custom map
implementations. For example, it may be convenient to return
arrays of SimpleEntry
instances in method
Map.entrySet().toArray
.Constructor | Description |
---|---|
SimpleEntry(Map.Entry<? extends K,? extends V> entry) |
Creates an entry representing the same mapping as the
specified entry.
|
SimpleEntry(K key,
V value) |
Creates an entry representing a mapping from the specified
key to the specified value.
|
Modifier and Type | Method | Description |
---|---|---|
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.
|
String |
toString() |
Returns a String representation of this map entry.
|
comparingByKey, comparingByKey, comparingByValue, comparingByValue
public SimpleEntry(K key, V value)
key
- the key represented by this entryvalue
- the value represented by this entrypublic K getKey()
public V getValue()
public V setValue(V value)
public 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. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2017, Oracle and/or its affiliates. 500 Oracle Parkway
Redwood Shores, CA 94065 USA. All rights reserved.
DRAFT 9-internal+0-adhoc.mlchung.jdk9-jdeps