java.lang.Object
- org.springframework.util.LinkedMultiValueMap<K,V>

Type Parameters:
K - the key type
V - the value element type
All Implemented Interfaces:
Serializable, Cloneable, Map<K,List<V>>, MultiValueMap<K,V>
```
public class LinkedMultiValueMap<K,V>
extends Object
implements MultiValueMap<K,V>, Serializable, Cloneable
```
Simple implementation of MultiValueMap that wraps a LinkedHashMap, storing multiple values in a LinkedList.
This Map implementation is generally not thread-safe. It is primarily designed for data structures exposed from request objects, for use in a single thread only.
Since:
3.0
Author:
Arjen Poutsma, Juergen Hoeller
See Also:
Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors
Constructor	Description
`LinkedMultiValueMap()`	Create a new LinkedMultiValueMap that wraps a `LinkedHashMap`.
`LinkedMultiValueMap(int initialCapacity)`	Create a new LinkedMultiValueMap that wraps a `LinkedHashMap` with the given initial capacity.
`LinkedMultiValueMap(Map<K,List<V>> otherMap)`	Copy constructor: Create a new LinkedMultiValueMap with the same mappings as the specified Map.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(K key, V value)`	Add the given single value to the current list of values for the given key.
`void`	`clear()`
`LinkedMultiValueMap<K,V>`	`clone()`	Create a regular copy of this Map.
`boolean`	`containsKey(Object key)`
`boolean`	`containsValue(Object value)`
`LinkedMultiValueMap<K,V>`	`deepCopy()`	Create a deep copy of this Map.
`Set<Map.Entry<K,List<V>>>`	`entrySet()`
`boolean`	`equals(Object other)`
`List<V>`	`get(Object key)`
`V`	`getFirst(K key)`	Return the first value for the given key.
`int`	`hashCode()`
`boolean`	`isEmpty()`
`Set<K>`	`keySet()`
`List<V>`	`put(K key, List<V> value)`
`void`	`putAll(Map<? extends K,? extends List<V>> map)`
`List<V>`	`remove(Object key)`
`void`	`set(K key, V value)`	Set the given single value under the given key.
`void`	`setAll(Map<K,V> values)`	Set the given values under.
`int`	`size()`
`Map<K,V>`	`toSingleValueMap()`	Return a `Map` with the first values contained in this `MultiValueMap`.
`String`	`toString()`
`Collection<List<V>>`	`values()`

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

- Constructor Detail
  - LinkedMultiValueMap
```
public LinkedMultiValueMap()
```
    Create a new LinkedMultiValueMap that wraps a LinkedHashMap.
  - LinkedMultiValueMap
```
public LinkedMultiValueMap(int initialCapacity)
```
    Create a new LinkedMultiValueMap that wraps a LinkedHashMap with the given initial capacity.
    Parameters:
    initialCapacity - the initial capacity
  - LinkedMultiValueMap
```
public LinkedMultiValueMap(Map<K,List<V>> otherMap)
```
    Copy constructor: Create a new LinkedMultiValueMap with the same mappings as the specified Map. Note that this will be a shallow copy; its value-holding List entries will get reused and therefore cannot get modified independently.
    Parameters:
    otherMap - the Map whose mappings are to be placed in this Map
    See Also:
    clone(), deepCopy()
- Method Detail
  - getFirst
```
public V getFirst(K key)
```
    Description copied from interface: MultiValueMap
    Return the first value for the given key.
    Specified by:
    getFirst in interface MultiValueMap<K,V>
    Parameters:
    key - the key
    Returns:
    the first value for the specified key, or null if none
  - add
```
public void add(K key,
                V value)
```
    Description copied from interface: MultiValueMap
    Add the given single value to the current list of values for the given key.
    Specified by:
    add in interface MultiValueMap<K,V>
    Parameters:
    key - the key
    value - the value to be added
  - set
```
public void set(K key,
                V value)
```
    Description copied from interface: MultiValueMap
    Set the given single value under the given key.
    Specified by:
    set in interface MultiValueMap<K,V>
    Parameters:
    key - the key
    value - the value to set
  - setAll
```
public void setAll(Map<K,V> values)
```
    Description copied from interface: MultiValueMap
    Set the given values under.
    Specified by:
    setAll in interface MultiValueMap<K,V>
    Parameters:
    values - the values.
  - toSingleValueMap
```
public Map<K,V> toSingleValueMap()
```
    Description copied from interface: MultiValueMap
    Return a Map with the first values contained in this MultiValueMap.
    Specified by:
    toSingleValueMap in interface MultiValueMap<K,V>
    Returns:
    a single value representation of this map
  - size
```
public int size()
```
    Specified by:
    size in interface Map<K,V>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    isEmpty in interface Map<K,V>
  - containsKey
```
public boolean containsKey(Object key)
```
    Specified by:
    containsKey in interface Map<K,V>
  - containsValue
```
public boolean containsValue(Object value)
```
    Specified by:
    containsValue in interface Map<K,V>
  - get
```
public List<V> get(Object key)
```
    Specified by:
    get in interface Map<K,V>
  - put
```
public List<V> put(K key,
                   List<V> value)
```
    Specified by:
    put in interface Map<K,V>
  - remove
```
public List<V> remove(Object key)
```
    Specified by:
    remove in interface Map<K,V>
  - putAll
```
public void putAll(Map<? extends K,? extends List<V>> map)
```
    Specified by:
    putAll in interface Map<K,V>
  - clear
```
public void clear()
```
    Specified by:
    clear in interface Map<K,V>
  - keySet
```
public Set<K> keySet()
```
    Specified by:
    keySet in interface Map<K,V>
  - values
```
public Collection<List<V>> values()
```
    Specified by:
    values in interface Map<K,V>
  - entrySet
```
public Set<Map.Entry<K,List<V>>> entrySet()
```
    Specified by:
    entrySet in interface Map<K,V>
  - deepCopy
```
public LinkedMultiValueMap<K,V> deepCopy()
```
    Create a deep copy of this Map.
    Returns:
    a copy of this Map, including a copy of each value-holding List entry
    Since:
    4.2
    See Also:
    clone()
  - clone
```
public LinkedMultiValueMap<K,V> clone()
```
    Create a regular copy of this Map.
    Overrides:
    clone in class Object
    Returns:
    a shallow copy of this Map, reusing this Map's value-holding List entries
    Since:
    4.2
    See Also:
    LinkedMultiValueMap(Map), deepCopy()
  - equals
```
public boolean equals(Object other)
```
    Specified by:
    equals in interface Map<K,V>
    Overrides:
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Specified by:
    hashCode in interface Map<K,V>
    Overrides:
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    toString in class Object

Class LinkedMultiValueMap<K,​V>

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Map

Constructor Detail

LinkedMultiValueMap

LinkedMultiValueMap

LinkedMultiValueMap

Method Detail

getFirst

add

set

setAll

toSingleValueMap

size

isEmpty

containsKey

containsValue

get

put

remove

putAll

clear

keySet

values

entrySet

deepCopy

clone

equals

hashCode

toString

Class LinkedMultiValueMap<K,V>