Uses of Interface
java.util.Map

Packages that use Map

Package	Description
java.lang
java.util

Uses of Map in java.lang

Methods in java.lang that return Map

Modifier and Type	Method and Description
static Map<Thread,StackTraceElement[]>	Thread.getAllStackTraces() Returns a map of stack traces for all live threads.

Uses of Map in java.util

Subinterfaces of Map in java.util

Modifier and Type	Interface and Description
interface	NavigableMap<K,V> A SortedMap extended with navigation methods returning the closest matches for given search targets.
interface	SortedMap<K,V> A Map that further provides a total ordering on its keys.

Classes in java.util that implement Map

Modifier and Type	Class and Description
class	AbstractMap<K,V> This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
class	HashMap<K,V> Hash table based implementation of the Map interface.
class	Hashtable<K,V> This class implements a hash table, which maps keys to values.
class	IdentityHashMap<K,V> This class implements the Map interface with a hash table, using reference-equality in place of object-equality when comparing keys (and values).
class	LinkedHashMap<K,V> Hash table and linked list implementation of the Map interface, with predictable iteration order.
class	TreeMap<K,V> A Red-Black tree based NavigableMap implementation.
class	WeakHashMap<K,V> Hash table based implementation of the Map interface, with weak keys.

Fields in java.util declared as Map

Modifier and Type	Field and Description
static Map	Collections.EMPTY_MAP The empty map (immutable).

Methods in java.util that return Map

Modifier and Type	Method and Description
static <K,V> Map<K,V>	Collections.emptyMap() Returns the empty map (immutable).
static <K,V> Map<K,V>	Collections.checkedMap(Map<K,V> m, Class<K> keyType, Class<V> valueType) Returns a dynamically typesafe view of the specified map.
static <K,V> Map<K,V>	Collections.singletonMap(K key, V value) Returns an immutable map, mapping only the specified key to the specified value.
static <K,V> Map<K,V>	Collections.synchronizedMap(Map<K,V> m) Returns a synchronized (thread-safe) map backed by the specified map.
static <K,V> Map<K,V>	Collections.unmodifiableMap(Map<? extends K,? extends V> m) Returns an unmodifiable view of the specified map.

Methods in java.util with parameters of type Map

Modifier and Type	Method and Description
static <K,V> Map<K,V>	Collections.checkedMap(Map<K,V> m, Class<K> keyType, Class<V> valueType) Returns a dynamically typesafe view of the specified map.
static <E> Set<E>	Collections.newSetFromMap(Map<E,Boolean> map) Returns a set backed by the specified map.
void	WeakHashMap.putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map.
void	TreeMap.putAll(Map<? extends K,? extends V> map) Copies all of the mappings from the specified map to this map.
void	Map.putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map (optional operation).
void	IdentityHashMap.putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map.
void	Hashtable.putAll(Map<? extends K,? extends V> t) Copies all of the mappings from the specified map to this hashtable.
void	HashMap.putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map.
void	AbstractMap.putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map (optional operation).
static <K,V> Map<K,V>	Collections.synchronizedMap(Map<K,V> m) Returns a synchronized (thread-safe) map backed by the specified map.
static <K,V> Map<K,V>	Collections.unmodifiableMap(Map<? extends K,? extends V> m) Returns an unmodifiable view of the specified map.

Constructors in java.util with parameters of type Map

Constructor and Description
HashMap(Map<? extends K,? extends V> m) Constructs a new HashMap with the same mappings as the specified Map.
Hashtable(Map<? extends K,? extends V> t) Constructs a new hashtable with the same mappings as the given Map.
IdentityHashMap(Map<? extends K,? extends V> m) Constructs a new identity hash map containing the keys-value mappings in the specified map.
LinkedHashMap(Map<? extends K,? extends V> m) Constructs an insertion-ordered LinkedHashMap instance with the same mappings as the specified map.
TreeMap(Map<? extends K,? extends V> m) Constructs a new tree map containing the same mappings as the given map, ordered according to the natural ordering of its keys.
WeakHashMap(Map<? extends K,? extends V> m) Constructs a new WeakHashMap with the same mappings as the specified map.