public
static
class
AbstractMap.SimpleEntry
extends Object
implements
Entry<K, V>,
Serializable
| java.lang.Object | |
| ↳ | java.util.AbstractMap.SimpleEntry<K, V> |
An Entry maintaining a key and a value. The value may be changed using the 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.
Public constructors | |
|---|---|
AbstractMap.SimpleEntry(K key, V value)
Creates an entry representing a mapping from the specified key to the specified value. |
|
AbstractMap.SimpleEntry(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. |
String
|
toString()
Returns a String representation of this map entry. |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
From
interface
java.util.Map.Entry
| |
Developers
AbstractMap.SimpleEntry (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
|
AbstractMap.SimpleEntry (Entry<? extends K, ? extends V> entry)
Creates an entry representing the same mapping as the specified entry.
| Parameters | |
|---|---|
entry |
Entry:
the entry to copy
|
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:
K getKey ()
Returns the key corresponding to this entry.
| Returns | |
|---|---|
K |
the key corresponding to this entry |
V getValue ()
Returns the value corresponding to this entry.
| Returns | |
|---|---|
V |
the value corresponding to this entry |
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 hashCode().
| Returns | |
|---|---|
int |
the hash code value for this map entry |
See also:
V setValue (V value)
Replaces the value corresponding to this entry with the specified value.
| Parameters | |
|---|---|
value |
V:
new value to be stored in this entry |
| Returns | |
|---|---|
V |
the old value corresponding to the entry |
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 |