cn.crane4j.core.util

类 EmptyMultiMap<K,V>

java.lang.Object

cn.crane4j.core.util.EmptyMultiMap<K,V>

所有已实现的接口:

MultiMap<K,V>

public class EmptyMultiMap<K,V>
extends Object
implements MultiMap<K,V>

An empty MultiMap implementation, which does not support any modification operations, and all values obtained are empty collections.

作者:

huangchengxing

字段概要

字段

限定符和类型	字段和说明
static EmptyMultiMap	INSTANCE instance。

构造器概要

构造器

构造器和说明
EmptyMultiMap()

方法概要

限定符和类型	方法和说明
Map<K,Collection<V>>	asMap() Get a java map of the multimap, the returned map is modifiable.
void	clear() Clear the map and remove all key-value pairs.
boolean	containsKey(Object o) Whether the map contains the specified key.
Collection<Map.Entry<K,V>>	entries() Get all key-value pairs in the map.
Collection<V>	get(K k) Get all values of the specified key, if the key does not exist, return an empty collection.
boolean	isEmpty() Whether the map is empty.
Set<K>	keySet() Get all keys in the map.
boolean	put(K k, V v) Put the specified key-value pair into the map.
void	putAll(K k, Iterable<? extends V> iterable) Put all key-value pairs in the specified map into the map.
void	putAll(MultiMap<K,V> multiMap) Put all key-value pairs in the specified map into the map.
Collection<V>	removeAll(Object o) Remove all key-value pairs with the specified key from the map.
int	size() Get the total number of key-value pairs in the map.
Collection<V>	values() Get all values in the map.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 cn.crane4j.core.util.MultiMap

arrayListMultimap, emptyMultiMap, equals, forEach, hashCode, linkedHashMultimap, linkedListMultimap

字段详细资料

INSTANCE

public static final EmptyMultiMap INSTANCE

instance。

构造器详细资料

EmptyMultiMap

public EmptyMultiMap()

方法详细资料

size

public int size()

Get the total number of key-value pairs in the map.

指定者:

size 在接口中 MultiMap<K,V>

返回:

the total number of key-value pairs in the map

isEmpty

public boolean isEmpty()

Whether the map is empty.

指定者:

isEmpty 在接口中 MultiMap<K,V>

返回:

whether the map is empty

containsKey

public boolean containsKey(Object o)

Whether the map contains the specified key.

指定者:

containsKey 在接口中 MultiMap<K,V>

参数:

o - key

返回:

whether the map contains the specified key

put

public boolean put(K k,
                   V v)

Put the specified key-value pair into the map.

指定者:

put 在接口中 MultiMap<K,V>

参数:

k - key

v - value

返回:

whether the map has changed

putAll

public void putAll(K k,
                   Iterable<? extends V> iterable)

Put all key-value pairs in the specified map into the map.

指定者:

putAll 在接口中 MultiMap<K,V>

参数:

k - key

iterable - values

putAll

public void putAll(MultiMap<K,V> multiMap)

Put all key-value pairs in the specified map into the map.

指定者:

putAll 在接口中 MultiMap<K,V>

参数:

multiMap - map

removeAll

public Collection<V> removeAll(Object o)

Remove all key-value pairs with the specified key from the map.

指定者:

removeAll 在接口中 MultiMap<K,V>

参数:

o - key

返回:

all values of the specified key

clear

public void clear()

Clear the map and remove all key-value pairs.

指定者:

clear 在接口中 MultiMap<K,V>

get

public Collection<V> get(K k)

Get all values of the specified key, if the key does not exist, return an empty collection.

指定者:

get 在接口中 MultiMap<K,V>

参数:

k - key

返回:

all values of the specified key

keySet

public Set<K> keySet()

Get all keys in the map.

指定者:

keySet 在接口中 MultiMap<K,V>

返回:

all keys in the map

values

public Collection<V> values()

Get all values in the map.

指定者:

values 在接口中 MultiMap<K,V>

返回:

all values in the map

entries

public Collection<Map.Entry<K,V>> entries()

Get all key-value pairs in the map.
The returned entries are modifiable, but the modification will not affect the map.

指定者:

entries 在接口中 MultiMap<K,V>

返回:

all key-value pairs in the map

asMap

public Map<K,Collection<V>> asMap()

Get a java map of the multimap, the returned map is modifiable.

指定者:

asMap 在接口中 MultiMap<K,V>

返回:

java map of the multi map