K getKey()
Returns the key corresponding to this entry.
IllegalStateException - implementations may, but are not required to, throw this exception if the entry has been removed from the backing map.
V getValue()
Returns the value corresponding to this entry. If the mapping has been removed from the backing map (by the iterator's remove operation), the results of this call are undefined.
IllegalStateException - implementations may, but are not required to, throw this exception if the entry has been removed from the backing map.
V setValue(V value)
Replaces the value corresponding to this entry with the specified value (optional operation). (Writes through to the map.) The behavior of this call is undefined if the mapping has already been removed from the map (by the iterator's remove operation).
value - new value to be stored in this entry
UnsupportedOperationException - if the put operation is not supported by the backing map
ClassCastException - if the class of the specified value prevents it from being stored in the backing map
NullPointerException - if the backing map does not permit null values, and the specified value is null
IllegalArgumentException - if some property of this value prevents it from being stored in the backing map
IllegalStateException - implementations may, but are not required to, throw this exception if the entry has been removed from the backing map.
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.
equals in class Object
o - object to be compared for equality with this map entry
true if the specified object is equal to this map entry
Object.hashCode(), HashMap
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
.
hashCode in class Object
Object.hashCode(), Object.equals(Object), equals(Object)
static <K extends Comparable<? super K>,V> Comparator<Map.Entry<K,V>> comparingByKey()
Returns a comparator that compares
Map.Entry
in natural order on key.
The returned comparator is serializable and throws NullPointerException when comparing an entry with a null key.
K - the Comparable type of then map keys
V - the type of the map values
Map.Entry in natural order on key.
Comparable
static <K,V extends Comparable<? super V>> Comparator<Map.Entry<K,V>> comparingByValue()
Returns a comparator that compares
Map.Entry
in natural order on value.
The returned comparator is serializable and throws NullPointerException when comparing an entry with null values.
K - the type of the map keys
V - the Comparable type of the map values
Map.Entry in natural order on value.
Comparable
static <K,V> Comparator<Map.Entry<K,V>> comparingByKey(Comparator<? super K> cmp)
Returns a comparator that compares
Map.Entry
by key using the given
Comparator
.
The returned comparator is serializable if the specified comparator is also serializable.
K - the type of the map keys
V - the type of the map values
cmp - the key Comparator
Map.Entry by the key.
static <K,V> Comparator<Map.Entry<K,V>> comparingByValue(Comparator<? super V> cmp)
Returns a comparator that compares
Map.Entry
by value using the given
Comparator
.
The returned comparator is serializable if the specified comparator is also serializable.
K - the type of the map keys
V - the type of the map values
cmp - the value Comparator
Map.Entry by the value.
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