Uses of Interface
java.util.Map

Packages that use Map

Package	Description
java.util

Uses of Map in java.util

Subinterfaces of Map in java.util

Modifier and Type	Interface and Description
interface	NavigableMap<K,V> NavigableMap is a SortedMap with navigation methods answering the closest matches for specified item.
interface	SortedMap<K,V> A map that has its keys ordered.

Classes in java.util that implement Map

Modifier and Type	Class and Description
class	AbstractMap<K,V> This class is an abstract implementation of the Map interface.
class	HashMap<K,V> HashMap is an implementation of Map.
class	Hashtable<K,V> Hashtable associates keys with values.
class	IdentityHashMap<K,V> IdentityHashMap is a variant on HashMap which tests equality by reference instead of equality by value.
class	LinkedHashMap<K,V> LinkedHashMap is a variant of HashMap.
class	TreeMap<K,V> TreeMap is an implementation of SortedMap.

Fields in java.util declared as Map

Modifier and Type	Field and Description
static Map	Collections.EMPTY_MAP An empty immutable instance of Map.

Methods in java.util that return Map

Modifier and Type	Method and Description
static <K,V> Map<K,V>	Collections.emptyMap() Returns a type-safe empty, immutable Map.
static <K,V> Map<K,V>	Collections.singletonMap(K key, V value) Returns a Map containing the specified key and value.
static <K,V> Map<K,V>	Collections.synchronizedMap(Map<K,V> map) Returns a wrapper on the specified map which synchronizes all access to the map.
static <K,V> Map<K,V>	Collections.unmodifiableMap(Map<? extends K,? extends V> map) Returns a wrapper on the specified map which throws an UnsupportedOperationException whenever an attempt is made to modify the map.

Methods in java.util with parameters of type Map

Modifier and Type	Method and Description
static <E> Set<E>	Collections.newSetFromMap(Map<E,Boolean> map) Answers a set backed by a map.
void	TreeMap.putAll(Map<? extends K,? extends V> map) Copies all the mappings in the given map to this map.
void	Map.putAll(Map<? extends K,? extends V> map) Copies every mapping in the specified Map to this Map.
void	IdentityHashMap.putAll(Map<? extends K,? extends V> map) Copies all the mappings in the specified map to this map.
void	Hashtable.putAll(Map<? extends K,? extends V> map) Copies every mapping to this Hashtable from the specified map.
void	HashMap.putAll(Map<? extends K,? extends V> map) Copies all the mappings in the specified map to this map.
void	AbstractMap.putAll(Map<? extends K,? extends V> map) Copies every mapping in the specified map to this map.
static <K,V> Map<K,V>	Collections.synchronizedMap(Map<K,V> map) Returns a wrapper on the specified map which synchronizes all access to the map.
static <K,V> Map<K,V>	Collections.unmodifiableMap(Map<? extends K,? extends V> map) Returns a wrapper on the specified map which throws an UnsupportedOperationException whenever an attempt is made to modify the map.

Constructors in java.util with parameters of type Map

Constructor and Description
HashMap(Map<? extends K,? extends V> map) Constructs a new HashMap instance containing the mappings from the specified map.
Hashtable(Map<? extends K,? extends V> map) Constructs a new instance of Hashtable containing the mappings from the specified map.
IdentityHashMap(Map<? extends K,? extends V> map) Creates an IdentityHashMap using the given map as initial values.
LinkedHashMap(Map<? extends K,? extends V> m) Constructs a new LinkedHashMap instance containing the mappings from the specified map.
TreeMap(Map<? extends K,? extends V> map) Constructs a new TreeMap instance containing the mappings from the specified map and using natural ordering.