public static interface Map.Entry<K,V>
Map.entrySet()| Modifier and Type | Method and Description | 
|---|---|
| static <K extends Comparable<? super K>,V> | comparingByKey()Returns a comparator that compares  Map.Entryin natural order on key. | 
| static <K,V> Comparator<Map.Entry<K,V>> | comparingByKey(Comparator<? super K> cmp)Returns a comparator that compares  Map.Entryby key using the givenComparator. | 
| static <K,V extends Comparable<? super V>> | comparingByValue()Returns a comparator that compares  Map.Entryin natural order on value. | 
| static <K,V> Comparator<Map.Entry<K,V>> | comparingByValue(Comparator<? super V> cmp)Returns a comparator that compares  Map.Entryby value using the givenComparator. | 
| 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 (optional operation). | 
K getKey()
IllegalStateException - implementations may, but are not
         required to, throw this exception if the entry has been
         removed from the backing map.V getValue()
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)
value - new value to be stored in this entryUnsupportedOperationException - if the put operation
         is not supported by the backing mapClassCastException - if the class of the specified value
         prevents it from being stored in the backing mapNullPointerException - if the backing map does not permit
         null values, and the specified value is nullIllegalArgumentException - if some property of this value
         prevents it from being stored in the backing mapIllegalStateException - implementations may, but are not
         required to, throw this exception if the entry has been
         removed from the backing map.boolean equals(Object o)
     (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 Objecto - object to be compared for equality with this map entryObject.hashCode(), 
HashMapint hashCode()
     (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 ObjectObject.hashCode(), 
Object.equals(Object), 
equals(Object)static <K extends Comparable<? super K>,V> Comparator<Map.Entry<K,V>> comparingByKey()
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 keysV - the type of the map valuesMap.Entry in natural order on key.Comparablestatic <K,V extends Comparable<? super V>> Comparator<Map.Entry<K,V>> comparingByValue()
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 keysV - the Comparable type of the map valuesMap.Entry in natural order on value.Comparablestatic <K,V> Comparator<Map.Entry<K,V>> comparingByKey(Comparator<? super K> cmp)
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 keysV - the type of the map valuescmp - the key ComparatorMap.Entry by the key.static <K,V> Comparator<Map.Entry<K,V>> comparingByValue(Comparator<? super V> cmp)
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 keysV - the type of the map valuescmp - the value ComparatorMap.Entry by the 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.
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