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AbstractMap.SimpleEntry

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.

Summary

Public constructors

SimpleEntry(K key, V value)

Creates an entry representing a mapping from the specified key to the specified value.

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

Public constructors

SimpleEntry

public 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

SimpleEntry

public 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

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.

Parameters
value V: new value to be stored in this entry

Returns
V the old value corresponding to the entry

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