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Java™ Platform Standard Ed. 6 |
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java.lang.Objectjava.util.AbstractMap.SimpleEntry<K,V>
public static class 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.
| Constructor Summary | |
|---|---|
AbstractMap.SimpleEntry(K key,
V value)
Creates an entry representing a mapping from the specified key to the specified value. |
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AbstractMap.SimpleEntry(Map.Entry<? extends K,? extends V> entry)
Creates an entry representing the same mapping as the specified entry. |
|
| Method Summary | |
|---|---|
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. |
| Methods inherited from class java.lang.Object |
|---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public AbstractMap.SimpleEntry(K key,
V value)
key - the key represented by this entryvalue - the value represented by this entrypublic AbstractMap.SimpleEntry(Map.Entry<? extends K,? extends V> entry)
entry - the entry to copy| Method Detail |
|---|
public K getKey()
getKey in interface Map.Entry<K,V>public V getValue()
getValue in interface Map.Entry<K,V>public V setValue(V value)
setValue in interface Map.Entry<K,V>value - new value to be stored in this entry
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.
equals in interface Map.Entry<K,V>equals in class Objecto - object to be compared for equality with this map entry
true if the specified object is equal to this map
entryhashCode()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().
hashCode in interface Map.Entry<K,V>hashCode in class Objectequals(java.lang.Object)public String toString()
toString in class Object
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Java™ Platform Standard Ed. 6 |
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Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.