HashMultimap (Vavr 0.10.3 API)

java.lang.Object
- io.vavr.collection.HashMultimap<K,V>

Type Parameters:

K - Key type

V - Value type

All Implemented Interfaces:

Foldable<Tuple2<K,V>>, Multimap<K,V>, Traversable<Tuple2<K,V>>, Function1<K,Traversable<V>>, PartialFunction<K,Traversable<V>>, Value<Tuple2<K,V>>, Serializable, Iterable<Tuple2<K,V>>, Function<K,Traversable<V>>
```
public final class HashMultimap<K,V>
extends Object
implements Serializable
```
A HashMap-based implementation of Multimap

Author:

Ruslan Sennov

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class HashMultimap.Builder<V>
- Nested classes/interfaces inherited from interface io.vavr.collection.Multimap
  Multimap.ContainerType

Nested Classes
Modifier and Type	Class and Description
`static class`	`HashMultimap.Builder<V>`

Field Summary

Fields
Modifier and Type Field and Description

protected Map<K,Traversable<V>> back

protected io.vavr.collection.AbstractMultimap.SerializableSupplier<Traversable<?>> emptyContainer

Fields
Modifier and Type	Field and Description
`protected Map<K,Traversable<V>>`	`back`
`protected io.vavr.collection.AbstractMultimap.SerializableSupplier<Traversable<?>>`	`emptyContainer`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Map<K,Traversable<V>>`	`asMap()` Converts this `Multimap` to a `Map`
`<K2,V2> Multimap<K2,V2>`	`bimap(Function<? super K,? extends K2> keyMapper, Function<? super V,? extends V2> valueMapper)` Maps this `Multimap` to a new `Multimap` with different component type by applying a function to its elements.
`boolean`	`containsKey(K key)` Returns `true` if this multimap contains a mapping for the specified key.
`protected <K2,V2> HashMultimap<K2,V2>`	`createFromMap(Map<K2,Traversable<V2>> back)`
`M`	`distinct()` Returns a new version of this which contains no duplicates.
`M`	`distinctBy(Comparator<? super Tuple2<K,V>> comparator)` Returns a new version of this which contains no duplicates.
`<U> M`	`distinctBy(Function<? super Tuple2<K,V>,? extends U> keyExtractor)` Returns a new version of this which contains no duplicates.
`M`	`drop(int n)` Drops the first n elements of this or all elements, if this length < n.
`M`	`dropRight(int n)` Drops the last n elements of this or all elements, if this length < n.
`M`	`dropUntil(Predicate<? super Tuple2<K,V>> predicate)` Drops elements until the predicate holds for the current element.
`M`	`dropWhile(Predicate<? super Tuple2<K,V>> predicate)` Drops elements while the predicate holds for the current element.
`protected <K2,V2> HashMultimap<K2,V2>`	`emptyInstance()`
`protected <K2,V2> Map<K2,V2>`	`emptyMapSupplier()`
`boolean`	`equals(Object o)` In Vavr there are four basic classes of collections: Seq (sequential elements) Set (distinct elements) Map (indexed elements) Multimap (indexed collections) Two collection instances of these classes are equal if and only if both collections belong to the same basic collection class (Seq, Set, Map or Multimap) contain the same elements have the same element order, if the collections are of type Seq Two Map/Multimap elements, resp.
`M`	`filter(BiPredicate<? super K,? super V> predicate)` Returns a new Multimap consisting of all elements which satisfy the given predicate.
`M`	`filter(Predicate<? super Tuple2<K,V>> predicate)` Returns a new traversable consisting of all elements which satisfy the given predicate.
`M`	`filterKeys(Predicate<? super K> predicate)` Returns a new Multimap consisting of all elements with keys which satisfy the given predicate.
`M`	`filterValues(Predicate<? super V> predicate)` Returns a new Multimap consisting of all elements with values which satisfy the given predicate.
`<K2,V2> Multimap<K2,V2>`	`flatMap(BiFunction<? super K,? super V,? extends Iterable<Tuple2<K2,V2>>> mapper)` FlatMaps this `Multimap` to a new `Multimap` with different component type.
`Option<Traversable<V>>`	`get(K key)` Returns the `Some` of value to which the specified key is mapped, or `None` if this multimap contains no mapping for the key.
`Multimap.ContainerType`	`getContainerType()` Returns the type of the `Traversable` value container of this `MultiMap`.
`Traversable<V>`	`getOrElse(K key, Traversable<? extends V> defaultValue)` Returns the value associated with a key, or a default value if the key is not contained in the map
`<C> Map<C,M>`	`groupBy(Function<? super Tuple2<K,V>,? extends C> classifier)` Groups this elements by classifying the elements.
`Iterator<M>`	`grouped(int size)` Groups this `Traversable` into fixed size blocks.
`int`	`hashCode()` Returns the hash code of this collection.
`Tuple2<K,V>`	`head()` Returns the first element of a non-empty Traversable.
`M`	`init()` Dual of Traversable.tail(), returning all elements except the last.
`Option<M>`	`initOption()` Dual of Traversable.tailOption(), returning all elements except the last as `Option`.
`boolean`	`isAsync()` Checks if this `Value` is asynchronously (short: async) computed.
`boolean`	`isEmpty()` Checks if this Traversable is empty.
`boolean`	`isLazy()` Checks if this `Value` is lazily evaluated.
`Iterator<Tuple2<K,V>>`	`iterator()` An iterator by means of head() and tail().
`Set<K>`	`keySet()` Returns the keys contained in this multimap.
`Tuple2<K,V>`	`last()` Dual of Traversable.head(), returning the last element.
`<K2,V2> Multimap<K2,V2>`	`map(BiFunction<? super K,? super V,Tuple2<K2,V2>> mapper)` Maps the entries of this `Multimap` to form a new `Multimap`.
`<V2> Multimap<K,V2>`	`mapValues(Function<? super V,? extends V2> valueMapper)` Maps the values of this `Multimap` while preserving the corresponding keys.
`M`	`merge(Multimap<? extends K,? extends V> that)` Creates a new multimap which by merging the entries of `this` multimap and `that` multimap.
`<K2 extends K,V2 extends V> M`	`merge(Multimap<K2,V2> that, BiFunction<Traversable<V>,Traversable<V2>,Traversable<V>> collisionResolution)` Creates a new multimap which by merging the entries of `this` multimap and `that` multimap.
`static <K,V> HashMultimap<K,V>`	`narrow(HashMultimap<? extends K,? extends V> map)` Narrows a widened `HashMultimap<? extends K, ? extends V>` to `HashMultimap<K, V>` by performing a type safe-cast.
`M`	`orElse(Iterable<? extends Tuple2<K,V>> other)` Returns this `Multimap` if it is nonempty, otherwise `Multimap` created from iterable, using existing multimap properties.
`M`	`orElse(Supplier<? extends Iterable<? extends Tuple2<K,V>>> supplier)` Returns this `Multimap` if it is nonempty, otherwise `Multimap` created from result of evaluating supplier, using existing multimap properties.
`Tuple2<M,M>`	`partition(Predicate<? super Tuple2<K,V>> predicate)` Creates a partition of this `Traversable` by splitting this elements in two in distinct traversables according to a predicate.
`M`	`peek(Consumer<? super Tuple2<K,V>> action)` Performs the given `action` on the first element if this is an eager implementation.
`M`	`put(K key, V value)` Associates the specified value with the specified key in this multimap.
`M`	`put(Tuple2<? extends K,? extends V> entry)` Convenience method for `put(entry._1, entry._2)`.
`M`	`reject(BiPredicate<? super K,? super V> predicate)` Returns a new Multimap consisting of all elements which do not satisfy the given predicate.
`M`	`reject(Predicate<? super Tuple2<K,V>> predicate)` Returns a new traversable consisting of all elements which do not satisfy the given predicate.
`M`	`rejectKeys(Predicate<? super K> predicate)` Returns a new Multimap consisting of all elements with keys which do not satisfy the given predicate.
`M`	`rejectValues(Predicate<? super V> predicate)` Returns a new Multimap consisting of all elements with values which do not satisfy the given predicate.
`M`	`remove(K key)` Removes the mapping for a key from this multimap if it is present.
`M`	`remove(K key, V value)` Removes the key-value pair from this multimap if it is present.
`M`	`removeAll(BiPredicate<? super K,? super V> predicate)` Deprecated.
`M`	`removeAll(Iterable<? extends K> keys)` Removes the mapping for a key from this multimap if it is present.
`M`	`removeKeys(Predicate<? super K> predicate)` Deprecated.
`M`	`removeValues(Predicate<? super V> predicate)` Deprecated.
`M`	`replace(K key, V oldValue, V newValue)` Replaces the entry with the specified key and oldValue.
`M`	`replace(Tuple2<K,V> currentElement, Tuple2<K,V> newElement)` Replaces the first occurrence (if exists) of the given currentElement with newElement.
`M`	`replaceAll(BiFunction<? super K,? super V,? extends V> function)` Replaces each entry's values with the result of invoking the given function on that each tuple until all entries have been processed or the function throws an exception.
`M`	`replaceAll(Tuple2<K,V> currentElement, Tuple2<K,V> newElement)` Replaces all occurrences of the given currentElement with newElement.
`M`	`replaceValue(K key, V value)` Replaces the entry for the specified key only if it is currently mapped to some value.
`M`	`retainAll(Iterable<? extends Tuple2<K,V>> elements)` Keeps all occurrences of the given elements from this.
`M`	`scan(Tuple2<K,V> zero, BiFunction<? super Tuple2<K,V>,? super Tuple2<K,V>,? extends Tuple2<K,V>> operation)` Computes a prefix scan of the elements of the collection.
`int`	`size()` Computes the number of elements of this Traversable.
`Iterator<M>`	`slideBy(Function<? super Tuple2<K,V>,?> classifier)` Slides a non-overlapping window of a variable size over this `Traversable`.
`Iterator<M>`	`sliding(int size)` Slides a window of a specific `size` and step size 1 over this `Traversable` by calling `Traversable.sliding(int, int)`.
`Iterator<M>`	`sliding(int size, int step)` Slides a window of a specific `size` and `step` size over this `Traversable`.
`Tuple2<M,M>`	`span(Predicate<? super Tuple2<K,V>> predicate)` Returns a tuple where the first element is the longest prefix of elements that satisfy the given `predicate` and the second element is the remainder.
`String`	`stringPrefix()` Returns the name of this Value type, which is used by toString().
`M`	`tail()` Drops the first element of a non-empty Traversable.
`Option<M>`	`tailOption()` Drops the first element of a non-empty Traversable and returns an `Option`.
`M`	`take(int n)` Takes the first n elements of this or all elements, if this length < n.
`M`	`takeRight(int n)` Takes the last n elements of this or all elements, if this length < n.
`M`	`takeUntil(Predicate<? super Tuple2<K,V>> predicate)` Takes elements until the predicate holds for the current element.
`M`	`takeWhile(Predicate<? super Tuple2<K,V>> predicate)` Takes elements while the predicate holds for the current element.
`Map<K,Collection<V>>`	`toJavaMap()` Converts this Vavr `Map` to a `java.util.Map` while preserving characteristics like insertion order (`LinkedHashMultimap`) and sort order (`SortedMultimap`).
`protected <JM extends Map<K,Collection<V>>> JM`	`toJavaMap(JM javaMap)`
`String`	`toString()` Clarifies that values have a proper toString() method implemented.
`Traversable<V>`	`values()`
`static <V> HashMultimap.Builder<V>`	`withSeq()`
`static <V> HashMultimap.Builder<V>`	`withSet()`
`static <V extends Comparable<?>> HashMultimap.Builder<V>`	`withSortedSet()`
`static <V> HashMultimap.Builder<V>`	`withSortedSet(Comparator<? super V> comparator)`

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

Methods inherited from interface io.vavr.collection.Multimap
apply, asPartialFunction, collect, contains, containsValue, flatMap, foldRight, forEach, hasDefiniteSize, isDefinedAt, isDistinct, isTraversableAgain, iterator, length, map, narrow, scanLeft, scanRight, transform, unzip, unzip, unzip3, unzip3, zip, zipAll, zipWith, zipWithIndex, zipWithIndex

Methods inherited from interface io.vavr.collection.Traversable
arrangeBy, average, containsAll, count, existsUnique, find, findLast, foldLeft, forEachWithIndex, get, headOption, isOrdered, isSequential, isSingleValued, lastOption, max, maxBy, maxBy, min, minBy, minBy, mkCharSeq, mkCharSeq, mkCharSeq, mkString, mkString, mkString, narrow, nonEmpty, product, reduceLeft, reduceLeftOption, reduceRight, reduceRightOption, single, singleOption, spliterator, sum

Methods inherited from interface io.vavr.collection.Foldable
fold, reduce, reduceOption

Methods inherited from interface io.vavr.Value
collect, collect, corresponds, eq, exists, forAll, forEach, getOrElse, getOrElse, getOrElseThrow, getOrElseTry, getOrNull, narrow, out, out, stderr, stdout, toArray, toCharSeq, toCompletableFuture, toEither, toEither, toInvalid, toInvalid, toJavaArray, toJavaArray, toJavaArray, toJavaCollection, toJavaList, toJavaList, toJavaMap, toJavaMap, toJavaMap, toJavaOptional, toJavaParallelStream, toJavaSet, toJavaSet, toJavaStream, toLeft, toLeft, toLinkedMap, toLinkedMap, toLinkedSet, toList, toMap, toMap, toOption, toPriorityQueue, toPriorityQueue, toQueue, toRight, toRight, toSet, toSortedMap, toSortedMap, toSortedMap, toSortedMap, toSortedSet, toSortedSet, toStream, toTree, toTree, toTry, toTry, toValid, toValid, toValidation, toValidation, toVector

Methods inherited from interface io.vavr.PartialFunction
getIfDefined, lift, unlift

Methods inherited from interface io.vavr.Function1
andThen, arity, compose, constant, curried, identity, isMemoized, lift, liftTry, memoized, narrow, of, partial, reversed, tupled

- Field Detail
  - back
```
protected final Map<K,Traversable<V>> back
```
  - emptyContainer
```
protected final io.vavr.collection.AbstractMultimap.SerializableSupplier<Traversable<?>> emptyContainer
```
- Method Detail
  - withSeq
```
public static <V> HashMultimap.Builder<V> withSeq()
```
  - withSet
```
public static <V> HashMultimap.Builder<V> withSet()
```
  - withSortedSet
```
public static <V extends Comparable<?>> HashMultimap.Builder<V> withSortedSet()
```
  - withSortedSet
```
public static <V> HashMultimap.Builder<V> withSortedSet(Comparator<? super V> comparator)
```
  - narrow
```
public static <K,V> HashMultimap<K,V> narrow(HashMultimap<? extends K,? extends V> map)
```
    Narrows a widened HashMultimap<? extends K, ? extends V> to HashMultimap<K, V> by performing a type safe-cast. This is eligible because immutable/read-only collections are covariant.
    
    Type Parameters:
    
    K - Key type
    
    V - Value type
    
    Parameters:
    
    map - A Map.
    
    Returns:
    
    the given multimap instance as narrowed type Multimap<K, V>.
  - emptyMapSupplier
```
protected <K2,V2> Map<K2,V2> emptyMapSupplier()
```
  - emptyInstance
```
protected <K2,V2> HashMultimap<K2,V2> emptyInstance()
```
  - createFromMap
```
protected <K2,V2> HashMultimap<K2,V2> createFromMap(Map<K2,Traversable<V2>> back)
```
  - asMap
```
public Map<K,Traversable<V>> asMap()
```
    Description copied from interface: Multimap
    
    Converts this Multimap to a Map
    
    Specified by:
    
    asMap in interface Multimap<K,V>
    
    Returns:
    
    Map<K, Traversable<V>>
  - bimap
```
public <K2,V2> Multimap<K2,V2> bimap(Function<? super K,? extends K2> keyMapper,
                                     Function<? super V,? extends V2> valueMapper)
```
    Description copied from interface: Multimap
    
    Maps this Multimap to a new Multimap with different component type by applying a function to its elements.
    
    Specified by:
    
    bimap in interface Multimap<K,V>
    
    Type Parameters:
    
    K2 - key's component type of the multimap result
    
    V2 - value's component type of the multimap result
    
    Parameters:
    
    keyMapper - a Function that maps the keys of type K to keys of type K2
    
    valueMapper - a Function that the values of type V to values of type V2
    
    Returns:
    
    a new Multimap
  - containsKey
```
public boolean containsKey(K key)
```
    Description copied from interface: Multimap
    
    Returns true if this multimap contains a mapping for the specified key.
    
    Specified by:
    
    containsKey in interface Multimap<K,V>
    
    Parameters:
    
    key - key whose presence in this multimap is to be tested
    
    Returns:
    
    true if this multimap contains a mapping for the specified key
  - getContainerType
```
public Multimap.ContainerType getContainerType()
```
    Description copied from interface: Multimap
    
    Returns the type of the Traversable value container of this MultiMap.
    
    Specified by:
    
    getContainerType in interface Multimap<K,V>
    
    Returns:
    
    an enum value representing the container type
  - flatMap
```
public <K2,V2> Multimap<K2,V2> flatMap(BiFunction<? super K,? super V,? extends Iterable<Tuple2<K2,V2>>> mapper)
```
    Description copied from interface: Multimap
    
    FlatMaps this Multimap to a new Multimap with different component type.
    
    Specified by:
    
    flatMap in interface Multimap<K,V>
    
    Type Parameters:
    
    K2 - key's component type of the mapped Multimap
    
    V2 - value's component type of the mapped Multimap
    
    Parameters:
    
    mapper - A mapper
    
    Returns:
    
    A new Multimap.
  - get
```
public Option<Traversable<V>> get(K key)
```
    Description copied from interface: Multimap
    
    Returns the Some of value to which the specified key is mapped, or None if this multimap contains no mapping for the key.
    
    Specified by:
    
    get in interface Multimap<K,V>
    
    Parameters:
    
    key - the key whose associated value is to be returned
    
    Returns:
    
    the Some of value to which the specified key is mapped, or None if this multimap contains no mapping for the key
  - getOrElse
```
public Traversable<V> getOrElse(K key,
                                Traversable<? extends V> defaultValue)
```
    Description copied from interface: Multimap
    
    Returns the value associated with a key, or a default value if the key is not contained in the map
    
    Specified by:
    
    getOrElse in interface Multimap<K,V>
    
    Parameters:
    
    key - the key
    
    defaultValue - a default value
    
    Returns:
    
    the value associated with key if it exists, otherwise the result of the default value
  - keySet
```
public Set<K> keySet()
```
    Description copied from interface: Multimap
    
    Returns the keys contained in this multimap.
    
    Specified by:
    
    keySet in interface Multimap<K,V>
    
    Returns:
    
    Set of the keys contained in this multimap.
  - map
```
public <K2,V2> Multimap<K2,V2> map(BiFunction<? super K,? super V,Tuple2<K2,V2>> mapper)
```
    Description copied from interface: Multimap
    
    Maps the entries of this Multimap to form a new Multimap.
    
    Specified by:
    
    map in interface Multimap<K,V>
    
    Type Parameters:
    
    K2 - key's component type of the multimap result
    
    V2 - value's component type of the multimap result
    
    Parameters:
    
    mapper - a Function that maps entries of type (K, V) to entries of type (K2, V2)
    
    Returns:
    
    a new Multimap
  - mapValues
```
public <V2> Multimap<K,V2> mapValues(Function<? super V,? extends V2> valueMapper)
```
    Description copied from interface: Multimap
    
    Maps the values of this Multimap while preserving the corresponding keys.
    
    Specified by:
    
    mapValues in interface Multimap<K,V>
    
    Type Parameters:
    
    V2 - the new value type
    
    Parameters:
    
    valueMapper - a Function that maps values of type V to values of type V2
    
    Returns:
    
    a new Multimap
  - put
```
public M put(K key,
             V value)
```
    Description copied from interface: Multimap
    
    Associates the specified value with the specified key in this multimap. If the map previously contained a mapping for the key, the old value is replaced by the specified value.
    
    Specified by:
    
    put in interface Multimap<K,V>
    
    Parameters:
    
    key - key with which the specified value is to be associated
    
    value - value to be associated with the specified key
    
    Returns:
    
    A new Multimap containing these elements and that entry.
  - put
```
public M put(Tuple2<? extends K,? extends V> entry)
```
    Description copied from interface: Multimap
    
    Convenience method for put(entry._1, entry._2).
    
    Specified by:
    
    put in interface Multimap<K,V>
    
    Parameters:
    
    entry - A Tuple2 containing the key and value
    
    Returns:
    
    A new Multimap containing these elements and that entry.
  - remove
```
public M remove(K key)
```
    Description copied from interface: Multimap
    
    Removes the mapping for a key from this multimap if it is present.
    
    Specified by:
    
    remove in interface Multimap<K,V>
    
    Parameters:
    
    key - key whose mapping is to be removed from the multimap
    
    Returns:
    
    A new Multimap containing these elements without the entry specified by that key.
  - remove
```
public M remove(K key,
                V value)
```
    Description copied from interface: Multimap
    
    Removes the key-value pair from this multimap if it is present.
    
    Specified by:
    
    remove in interface Multimap<K,V>
    
    Parameters:
    
    key - key whose mapping is to be removed from the multimap
    
    value - value whose mapping is to be removed from the multimap
    
    Returns:
    
    A new Multimap containing these elements without the entry specified by that key and value.
  - removeAll
```
public M removeAll(Iterable<? extends K> keys)
```
    Description copied from interface: Multimap
    
    Removes the mapping for a key from this multimap if it is present.
    
    Specified by:
    
    removeAll in interface Multimap<K,V>
    
    Parameters:
    
    keys - keys are to be removed from the multimap
    
    Returns:
    
    A new Multimap containing these elements without the entries specified by that keys.
  - size
```
public int size()
```
    Description copied from interface: Traversable
    
    Computes the number of elements of this Traversable.
    Same as Traversable.length().
    
    Specified by:
    
    size in interface Multimap<K,V>
    
    Specified by:
    
    size in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    the number of elements
  - values
```
public Traversable<V> values()
```
    Specified by:
    
    values in interface Multimap<K,V>
  - distinct
```
public M distinct()
```
    Description copied from interface: Traversable
    
    Returns a new version of this which contains no duplicates. Elements are compared using equals.
    
    Specified by:
    
    distinct in interface Multimap<K,V>
    
    Specified by:
    
    distinct in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    a new Traversable containing this elements without duplicates
  - distinctBy
```
public M distinctBy(Comparator<? super Tuple2<K,V>> comparator)
```
    Description copied from interface: Traversable
    
    Returns a new version of this which contains no duplicates. Elements are compared using the given comparator.
    
    Specified by:
    
    distinctBy in interface Multimap<K,V>
    
    Specified by:
    
    distinctBy in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    comparator - A comparator
    
    Returns:
    
    a new Traversable containing this elements without duplicates
  - distinctBy
```
public <U> M distinctBy(Function<? super Tuple2<K,V>,? extends U> keyExtractor)
```
    Description copied from interface: Traversable
    
    Returns a new version of this which contains no duplicates. Elements mapped to keys which are compared using equals.
    The elements of the result are determined in the order of their occurrence - first match wins.
    
    Specified by:
    
    distinctBy in interface Multimap<K,V>
    
    Specified by:
    
    distinctBy in interface Traversable<Tuple2<K,V>>
    
    Type Parameters:
    
    U - key type
    
    Parameters:
    
    keyExtractor - A key extractor
    
    Returns:
    
    a new Traversable containing this elements without duplicates
  - drop
```
public M drop(int n)
```
    Description copied from interface: Traversable
    
    Drops the first n elements of this or all elements, if this length < n.
    
    Specified by:
    
    drop in interface Multimap<K,V>
    
    Specified by:
    
    drop in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    n - The number of elements to drop.
    
    Returns:
    
    a new instance consisting of all elements of this except the first n ones, or else the empty instance, if this has less than n elements.
  - dropRight
```
public M dropRight(int n)
```
    Description copied from interface: Traversable
    
    Drops the last n elements of this or all elements, if this length < n.
    
    Specified by:
    
    dropRight in interface Multimap<K,V>
    
    Specified by:
    
    dropRight in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    n - The number of elements to drop.
    
    Returns:
    
    a new instance consisting of all elements of this except the last n ones, or else the empty instance, if this has less than n elements.
  - dropUntil
```
public M dropUntil(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Drops elements until the predicate holds for the current element.
    
    Specified by:
    
    dropUntil in interface Multimap<K,V>
    
    Specified by:
    
    dropUntil in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A condition tested subsequently for this elements.
    
    Returns:
    
    a new instance consisting of all elements starting from the first one which does satisfy the given predicate.
  - dropWhile
```
public M dropWhile(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Drops elements while the predicate holds for the current element.
    Note: This is essentially the same as dropUntil(predicate.negate()). It is intended to be used with method references, which cannot be negated directly.
    
    Specified by:
    
    dropWhile in interface Multimap<K,V>
    
    Specified by:
    
    dropWhile in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A condition tested subsequently for this elements.
    
    Returns:
    
    a new instance consisting of all elements starting from the first one which does not satisfy the given predicate.
  - filter
```
public M filter(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Returns a new traversable consisting of all elements which satisfy the given predicate.
    
    Specified by:
    
    filter in interface Multimap<K,V>
    
    Specified by:
    
    filter in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A predicate
    
    Returns:
    
    a new traversable
  - reject
```
public M reject(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    Returns a new traversable consisting of all elements which do not satisfy the given predicate.
    The default implementation is equivalent to
```
 filter(predicate.negate()
```
    Specified by:
    
    reject in interface Multimap<K,V>
    
    Specified by:
    
    reject in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A predicate
    
    Returns:
    
    a new traversable
  - filter
```
public M filter(BiPredicate<? super K,? super V> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements which satisfy the given predicate.
    
    Specified by:
    
    filter in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test elements
    
    Returns:
    
    a new Multimap
  - reject
```
public M reject(BiPredicate<? super K,? super V> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements which do not satisfy the given predicate.
    
    Specified by:
    
    reject in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test elements
    
    Returns:
    
    a new Multimap
  - filterKeys
```
public M filterKeys(Predicate<? super K> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with keys which satisfy the given predicate.
    
    Specified by:
    
    filterKeys in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test keys of elements
    
    Returns:
    
    a new Multimap
  - rejectKeys
```
public M rejectKeys(Predicate<? super K> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with keys which do not satisfy the given predicate.
    
    Specified by:
    
    rejectKeys in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test keys of elements
    
    Returns:
    
    a new Multimap
  - filterValues
```
public M filterValues(Predicate<? super V> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with values which satisfy the given predicate.
    
    Specified by:
    
    filterValues in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test values of elements
    
    Returns:
    
    a new Multimap
  - rejectValues
```
public M rejectValues(Predicate<? super V> predicate)
```
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with values which do not satisfy the given predicate.
    
    Specified by:
    
    rejectValues in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test values of elements
    
    Returns:
    
    a new Multimap
  - removeAll
```
@Deprecated
public M removeAll(BiPredicate<? super K,? super V> predicate)
```
    Deprecated.
    
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements which do not satisfy the given predicate.
    
    Specified by:
    
    removeAll in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test elements
    
    Returns:
    
    a new Multimap
  - removeKeys
```
@Deprecated
public M removeKeys(Predicate<? super K> predicate)
```
    Deprecated.
    
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with keys which do not satisfy the given predicate.
    
    Specified by:
    
    removeKeys in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test keys of elements
    
    Returns:
    
    a new Multimap
  - removeValues
```
@Deprecated
public M removeValues(Predicate<? super V> predicate)
```
    Deprecated.
    
    Description copied from interface: Multimap
    
    Returns a new Multimap consisting of all elements with values which do not satisfy the given predicate.
    
    Specified by:
    
    removeValues in interface Multimap<K,V>
    
    Parameters:
    
    predicate - the predicate used to test values of elements
    
    Returns:
    
    a new Multimap
  - groupBy
```
public <C> Map<C,M> groupBy(Function<? super Tuple2<K,V>,? extends C> classifier)
```
    Description copied from interface: Traversable
    
    Groups this elements by classifying the elements.
    
    Specified by:
    
    groupBy in interface Multimap<K,V>
    
    Specified by:
    
    groupBy in interface Traversable<Tuple2<K,V>>
    
    Type Parameters:
    
    C - classified class type
    
    Parameters:
    
    classifier - A function which classifies elements into classes
    
    Returns:
    
    A Map containing the grouped elements
    
    See Also:
    
    Traversable.arrangeBy(Function)
  - grouped
```
public Iterator<M> grouped(int size)
```
    Description copied from interface: Traversable
    Groups this Traversable into fixed size blocks.
    Let length be the length of this Iterable. Then grouped is defined as follows:
    - If this.isEmpty(), the resulting Iterator is empty.
    - If size <= length, the resulting Iterator will contain length / size blocks of size size and maybe a non-empty block of size length % size, if there are remaining elements.
    - If size > length, the resulting Iterator will contain one block of size length.
    Examples:
```
 
 [].grouped(1) = []
 [].grouped(0) throws
 [].grouped(-1) throws
 [1,2,3,4].grouped(2) = [[1,2],[3,4]]
 [1,2,3,4,5].grouped(2) = [[1,2],[3,4],[5]]
 [1,2,3,4].grouped(5) = [[1,2,3,4]]
 
 
```
    Please note that grouped(int) is a special case of Traversable.sliding(int, int), i.e. grouped(size) is the same as sliding(size, size).
    Specified by:
    
    grouped in interface Multimap<K,V>
    
    Specified by:
    
    grouped in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    size - a positive block size
    
    Returns:
    
    A new Iterator of grouped blocks of the given size
  - init
```
public M init()
```
    Description copied from interface: Traversable
    
    Dual of Traversable.tail(), returning all elements except the last.
    
    Specified by:
    
    init in interface Multimap<K,V>
    
    Specified by:
    
    init in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    a new instance containing all elements except the last.
  - head
```
public Tuple2<K,V> head()
```
    Description copied from interface: Traversable
    
    Returns the first element of a non-empty Traversable.
    
    Specified by:
    
    head in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    The first element of this Traversable.
  - initOption
```
public Option<M> initOption()
```
    Description copied from interface: Traversable
    
    Dual of Traversable.tailOption(), returning all elements except the last as Option.
    
    Specified by:
    
    initOption in interface Multimap<K,V>
    
    Specified by:
    
    initOption in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    Some(traversable) or None if this is empty.
  - isAsync
```
public boolean isAsync()
```
    Description copied from interface: Value
    
    Checks if this Value is asynchronously (short: async) computed.
    Methods of a Value instance that operate on the underlying value may block the current thread until the value is present and the computation can be performed.
    
    Specified by:
    
    isAsync in interface Value<Tuple2<K,V>>
    
    Returns:
    
    true if this Value is async (like Future), false otherwise.
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: Traversable
    
    Checks if this Traversable is empty.
    
    Specified by:
    
    isEmpty in interface Traversable<Tuple2<K,V>>
    
    Specified by:
    
    isEmpty in interface Value<Tuple2<K,V>>
    
    Returns:
    
    true, if this Traversable contains no elements, false otherwise.
  - isLazy
```
public boolean isLazy()
```
    Description copied from interface: Value
    
    Checks if this Value is lazily evaluated.
    
    Specified by:
    
    isLazy in interface Value<Tuple2<K,V>>
    
    Returns:
    
    true if this Value is lazy (like Lazy and Stream), false otherwise.
  - iterator
```
public Iterator<Tuple2<K,V>> iterator()
```
    Description copied from interface: Traversable
    
    An iterator by means of head() and tail(). Subclasses may want to override this method.
    
    Specified by:
    
    iterator in interface Multimap<K,V>
    
    Specified by:
    
    iterator in interface Traversable<Tuple2<K,V>>
    
    Specified by:
    
    iterator in interface Value<Tuple2<K,V>>
    
    Specified by:
    
    iterator in interface Iterable<Tuple2<K,V>>
    
    Returns:
    
    A new Iterator of this Traversable elements.
  - last
```
public Tuple2<K,V> last()
```
    Description copied from interface: Traversable
    
    Dual of Traversable.head(), returning the last element.
    
    Specified by:
    
    last in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    the last element.
  - merge
```
public M merge(Multimap<? extends K,? extends V> that)
```
    Description copied from interface: Multimap
    
    Creates a new multimap which by merging the entries of this multimap and that multimap.
    If collisions occur, the value of this multimap is taken.
    
    Specified by:
    
    merge in interface Multimap<K,V>
    
    Parameters:
    
    that - the other multimap
    
    Returns:
    
    A merged multimap
  - merge
```
public <K2 extends K,V2 extends V> M merge(Multimap<K2,V2> that,
                                           BiFunction<Traversable<V>,Traversable<V2>,Traversable<V>> collisionResolution)
```
    Description copied from interface: Multimap
    
    Creates a new multimap which by merging the entries of this multimap and that multimap.
    Uses the specified collision resolution function if two keys are the same. The collision resolution function will always take the first argument from this multimap and the second from that multimap.
    
    Specified by:
    
    merge in interface Multimap<K,V>
    
    Type Parameters:
    
    K2 - key type of that Multimap
    
    V2 - value type of that Multimap
    
    Parameters:
    
    that - the other multimap
    
    collisionResolution - the collision resolution function
    
    Returns:
    
    A merged multimap
  - orElse
```
public M orElse(Iterable<? extends Tuple2<K,V>> other)
```
    Returns this Multimap if it is nonempty, otherwise Multimap created from iterable, using existing multimap properties.
    
    Specified by:
    
    orElse in interface Multimap<K,V>
    
    Specified by:
    
    orElse in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    other - An alternative Traversable
    
    Returns:
    
    this Multimap if it is nonempty, otherwise Multimap created from iterable, using existing multimap properties.
  - orElse
```
public M orElse(Supplier<? extends Iterable<? extends Tuple2<K,V>>> supplier)
```
    Returns this Multimap if it is nonempty, otherwise Multimap created from result of evaluating supplier, using existing multimap properties.
    
    Specified by:
    
    orElse in interface Multimap<K,V>
    
    Specified by:
    
    orElse in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    supplier - An alternative Traversable
    
    Returns:
    
    this Multimap if it is nonempty, otherwise Multimap created from result of evaluating supplier, using existing multimap properties.
  - partition
```
public Tuple2<M,M> partition(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Creates a partition of this Traversable by splitting this elements in two in distinct traversables according to a predicate.
    
    Specified by:
    
    partition in interface Multimap<K,V>
    
    Specified by:
    
    partition in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A predicate which classifies an element if it is in the first or the second traversable.
    
    Returns:
    
    A disjoint union of two traversables. The first Traversable contains all elements that satisfy the given predicate, the second Traversable contains all elements that don't. The original order of elements is preserved.
  - peek
```
public M peek(Consumer<? super Tuple2<K,V>> action)
```
    Description copied from interface: Value
    
    Performs the given action on the first element if this is an eager implementation. Performs the given action on all elements (the first immediately, successive deferred), if this is a lazy implementation.
    
    Specified by:
    
    peek in interface Multimap<K,V>
    
    Specified by:
    
    peek in interface Traversable<Tuple2<K,V>>
    
    Specified by:
    
    peek in interface Value<Tuple2<K,V>>
    
    Parameters:
    
    action - The action that will be performed on the element(s).
    
    Returns:
    
    this instance
  - replace
```
public M replace(Tuple2<K,V> currentElement,
                 Tuple2<K,V> newElement)
```
    Description copied from interface: Traversable
    
    Replaces the first occurrence (if exists) of the given currentElement with newElement.
    
    Specified by:
    
    replace in interface Multimap<K,V>
    
    Specified by:
    
    replace in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    currentElement - An element to be substituted.
    
    newElement - A replacement for currentElement.
    
    Returns:
    
    a Traversable containing all elements of this where the first occurrence of currentElement is replaced with newElement.
  - replaceAll
```
public M replaceAll(Tuple2<K,V> currentElement,
                    Tuple2<K,V> newElement)
```
    Description copied from interface: Traversable
    
    Replaces all occurrences of the given currentElement with newElement.
    
    Specified by:
    
    replaceAll in interface Multimap<K,V>
    
    Specified by:
    
    replaceAll in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    currentElement - An element to be substituted.
    
    newElement - A replacement for currentElement.
    
    Returns:
    
    a Traversable containing all elements of this where all occurrences of currentElement are replaced with newElement.
  - replaceValue
```
public M replaceValue(K key,
                      V value)
```
    Description copied from interface: Multimap
    
    Replaces the entry for the specified key only if it is currently mapped to some value.
    
    Specified by:
    
    replaceValue in interface Multimap<K,V>
    
    Parameters:
    
    key - the key of the element to be substituted
    
    value - the new value to be associated with the key
    
    Returns:
    
    a new map containing key mapped to value if key was contained before. The old map otherwise
  - replace
```
public M replace(K key,
                 V oldValue,
                 V newValue)
```
    Description copied from interface: Multimap
    
    Replaces the entry with the specified key and oldValue.
    
    Specified by:
    
    replace in interface Multimap<K,V>
    
    Parameters:
    
    key - the key of the element to be substituted
    
    oldValue - the expected current value associated with the key
    
    newValue - the new value to be associated with the key
    
    Returns:
    
    a new map containing key mapped to newValue if key was contained before and oldValue was associated with the key. The old map otherwise.
  - replaceAll
```
public M replaceAll(BiFunction<? super K,? super V,? extends V> function)
```
    Description copied from interface: Multimap
    
    Replaces each entry's values with the result of invoking the given function on that each tuple until all entries have been processed or the function throws an exception.
    
    Specified by:
    
    replaceAll in interface Multimap<K,V>
    
    Parameters:
    
    function - function transforming key and current value to a new value
    
    Returns:
    
    a new map with the same keySet but transformed values
  - retainAll
```
public M retainAll(Iterable<? extends Tuple2<K,V>> elements)
```
    Description copied from interface: Traversable
    
    Keeps all occurrences of the given elements from this.
    
    Specified by:
    
    retainAll in interface Multimap<K,V>
    
    Specified by:
    
    retainAll in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    elements - Elements to be kept.
    
    Returns:
    
    a Traversable containing all occurrences of the given elements.
  - scan
```
public M scan(Tuple2<K,V> zero,
              BiFunction<? super Tuple2<K,V>,? super Tuple2<K,V>,? extends Tuple2<K,V>> operation)
```
    Description copied from interface: Traversable
    
    Computes a prefix scan of the elements of the collection. Note: The neutral element z may be applied more than once.
    
    Specified by:
    
    scan in interface Multimap<K,V>
    
    Specified by:
    
    scan in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    zero - neutral element for the operator op
    
    operation - the associative operator for the scan
    
    Returns:
    
    a new traversable collection containing the prefix scan of the elements in this traversable collection
  - slideBy
```
public Iterator<M> slideBy(Function<? super Tuple2<K,V>,?> classifier)
```
    Description copied from interface: Traversable
    Slides a non-overlapping window of a variable size over this Traversable.
    Each window contains elements with the same class, as determined by classifier. Two consecutive values in this Traversable will be in the same window only if classifier returns equal values for them. Otherwise, the values will constitute the last element of the previous window and the first element of the next window.
    Examples:
```
 [].slideBy(Function.identity()) = []
 [1,2,3,4,4,5].slideBy(Function.identity()) = [[1],[2],[3],[4,4],[5]]
 [1,2,3,10,12,5,7,20,29].slideBy(x -> x/10) = [[1,2,3],[10,12],[5,7],[20,29]]
 
```
    Specified by:
    
    slideBy in interface Multimap<K,V>
    
    Specified by:
    
    slideBy in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    classifier - A function which classifies elements into classes
    
    Returns:
    
    A new Iterator of windows of the grouped elements
  - sliding
```
public Iterator<M> sliding(int size)
```
    Description copied from interface: Traversable
    
    Slides a window of a specific size and step size 1 over this Traversable by calling Traversable.sliding(int, int).
    
    Specified by:
    
    sliding in interface Multimap<K,V>
    
    Specified by:
    
    sliding in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    size - a positive window size
    
    Returns:
    
    a new Iterator of windows of a specific size using step size 1
  - sliding
```
public Iterator<M> sliding(int size,
                           int step)
```
    Description copied from interface: Traversable
    Slides a window of a specific size and step size over this Traversable.
    Examples:
```
 
 [].sliding(1,1) = []
 [1,2,3,4,5].sliding(2,3) = [[1,2],[4,5]]
 [1,2,3,4,5].sliding(2,4) = [[1,2],[5]]
 [1,2,3,4,5].sliding(2,5) = [[1,2]]
 [1,2,3,4].sliding(5,3) = [[1,2,3,4],[4]]
 
 
```
    Specified by:
    
    sliding in interface Multimap<K,V>
    
    Specified by:
    
    sliding in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    size - a positive window size
    
    step - a positive step size
    
    Returns:
    
    a new Iterator of windows of a specific size using a specific step size
  - span
```
public Tuple2<M,M> span(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Returns a tuple where the first element is the longest prefix of elements that satisfy the given predicate and the second element is the remainder.
    
    Specified by:
    
    span in interface Multimap<K,V>
    
    Specified by:
    
    span in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A predicate.
    
    Returns:
    
    a Tuple containing the longest prefix of elements that satisfy p and the remainder.
  - tail
```
public M tail()
```
    Description copied from interface: Traversable
    
    Drops the first element of a non-empty Traversable.
    
    Specified by:
    
    tail in interface Multimap<K,V>
    
    Specified by:
    
    tail in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    A new instance of Traversable containing all elements except the first.
  - tailOption
```
public Option<M> tailOption()
```
    Description copied from interface: Traversable
    
    Drops the first element of a non-empty Traversable and returns an Option.
    
    Specified by:
    
    tailOption in interface Multimap<K,V>
    
    Specified by:
    
    tailOption in interface Traversable<Tuple2<K,V>>
    
    Returns:
    
    Some(traversable) or None if this is empty.
  - take
```
public M take(int n)
```
    Description copied from interface: Traversable
    
    Takes the first n elements of this or all elements, if this length < n.
    The result is equivalent to sublist(0, max(0, min(length(), n))) but does not throw if n < 0 or n > length().
    In the case of n < 0 the empty instance is returned, in the case of n > length() this is returned.
    
    Specified by:
    
    take in interface Multimap<K,V>
    
    Specified by:
    
    take in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    n - The number of elements to take.
    
    Returns:
    
    A new instance consisting of the first n elements of this or all elements, if this has less than n elements.
  - takeRight
```
public M takeRight(int n)
```
    Description copied from interface: Traversable
    
    Takes the last n elements of this or all elements, if this length < n.
    The result is equivalent to sublist(max(0, min(length(), length() - n)), n), i.e. takeRight will not throw if n < 0 or n > length().
    In the case of n < 0 the empty instance is returned, in the case of n > length() this is returned.
    
    Specified by:
    
    takeRight in interface Multimap<K,V>
    
    Specified by:
    
    takeRight in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    n - The number of elements to take.
    
    Returns:
    
    A new instance consisting of the last n elements of this or all elements, if this has less than n elements.
  - takeUntil
```
public M takeUntil(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Takes elements until the predicate holds for the current element.
    Note: This is essentially the same as takeWhile(predicate.negate()). It is intended to be used with method references, which cannot be negated directly.
    
    Specified by:
    
    takeUntil in interface Multimap<K,V>
    
    Specified by:
    
    takeUntil in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A condition tested subsequently for this elements.
    
    Returns:
    
    a new instance consisting of all elements before the first one which does satisfy the given predicate.
  - takeWhile
```
public M takeWhile(Predicate<? super Tuple2<K,V>> predicate)
```
    Description copied from interface: Traversable
    
    Takes elements while the predicate holds for the current element.
    
    Specified by:
    
    takeWhile in interface Multimap<K,V>
    
    Specified by:
    
    takeWhile in interface Traversable<Tuple2<K,V>>
    
    Parameters:
    
    predicate - A condition tested subsequently for the contained elements.
    
    Returns:
    
    a new instance consisting of all elements before the first one which does not satisfy the given predicate.
  - equals
```
public boolean equals(Object o)
```
    Description copied from interface: Traversable
    In Vavr there are four basic classes of collections:
    - Seq (sequential elements)
    - Set (distinct elements)
    - Map (indexed elements)
    - Multimap (indexed collections)
    Two collection instances of these classes are equal if and only if both collections
    - belong to the same basic collection class (Seq, Set, Map or Multimap)
    - contain the same elements
    - have the same element order, if the collections are of type Seq
    Two Map/Multimap elements, resp. entries, (key1, value1) and (key2, value2) are equal, if the keys are equal and the values are equal.
    Notes:
    - No collection instance equals null, e.g. Queue(1) not equals null.
    - Nulls are allowed and handled as expected, e.g. List(null, 1) equals Stream(null, 1) and HashMap((null, 1)) equals LinkedHashMap((null, 1)).
    - The element order is taken into account for Seq only. E.g. List(null, 1) not equals Stream(1, null) and HashMap((null, 1), ("a", null)) equals LinkedHashMap(("a", null), (null, 1)). The reason is, that we do not know which implementations we compare when having two instances of type Map, Multimap or Set (see Liskov Substitution Principle).
    - Other collection classes are equal if their types are equal and their elements are equal (in iteration order).
    - Iterator equality is defined to be object reference equality.
    Specified by:
    
    equals in interface Traversable<Tuple2<K,V>>
    
    Specified by:
    
    equals in interface Value<Tuple2<K,V>>
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    o - an object, may be null
    
    Returns:
    
    true, if this collection equals the given object according to the rules described above, false otherwise.
  - hashCode
```
public int hashCode()
```
    Description copied from interface: Traversable
    Returns the hash code of this collection.
    We distinguish between two types of hashes, those for collections with predictable iteration order (like Seq) and those with arbitrary iteration order (like Set, Map and Multimap).
    In all cases the hash of an empty collection is defined to be 1.
    Collections with predictable iteration order are hashed as follows:
```
 int hash = 1;
 for (T t : this) { hash = hash * 31 + Objects.hashCode(t); }
 
```
    Collections with arbitrary iteration order are hashed in a way such that the hash of a fixed number of elements is independent of their iteration order.
```
 int hash = 1;
 for (T t : this) { hash += Objects.hashCode(t); }
 
```
    Please note that the particular hashing algorithms may change in a future version of Vavr.
    Generally, hash codes of collections aren't cached in Vavr (opposed to the size/length). Storing hash codes in order to reduce the time complexity would increase the memory footprint. Persistent collections are built upon tree structures, it allows us to implement efficient memory sharing. A drawback of tree structures is that they make it necessary to store collection attributes at each tree node (read: element).
    The computation of the hash code is linear in time, i.e. O(n). If the hash code of a collection is re-calculated often, e.g. when using a List as HashMap key, we might want to cache the hash code. This can be achieved by simply using a wrapper class, which is not included in Vavr but could be implemented like this:
```
 public final class Hashed<K> {

     private final K key;
     private final Lazy<Integer> hashCode;

     public Hashed(K key) {
         this.key = key;
         this.hashCode = Lazy.of(() -> Objects.hashCode(key));
     }

     public K key() {
         return key;
     }

     &#64;Override
     public boolean equals(Object o) {
         if (o == key) {
             return true;
         } else if (key != null && o instanceof Hashed) {
             final Hashed that = (Hashed) o;
             return key.equals(that.key);
         } else {
             return false;
         }
     }

     &#64;Override
     public int hashCode() {
         return hashCode.get();
     }

     &#64;Override
     public String toString() {
         return "Hashed(" + (key == null ? "null" : key.toString()) + ")";
     }
 }
```
    Specified by:
    
    hashCode in interface Traversable<Tuple2<K,V>>
    
    Specified by:
    
    hashCode in interface Value<Tuple2<K,V>>
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    The hash code of this collection
  - stringPrefix
```
public String stringPrefix()
```
    Description copied from interface: Value
    
    Returns the name of this Value type, which is used by toString().
    
    Specified by:
    
    stringPrefix in interface Value<Tuple2<K,V>>
    
    Returns:
    
    This type name.
  - toString
```
public String toString()
```
    Description copied from interface: Value
    
    Clarifies that values have a proper toString() method implemented.
    See Object.toString().
    
    Specified by:
    
    toString in interface Value<Tuple2<K,V>>
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    A String representation of this object
  - toJavaMap
```
public Map<K,Collection<V>> toJavaMap()
```
    Description copied from interface: Multimap
    
    Converts this Vavr Map to a java.util.Map while preserving characteristics like insertion order (LinkedHashMultimap) and sort order (SortedMultimap).
    
    Specified by:
    
    toJavaMap in interface Multimap<K,V>
    
    Returns:
    
    a new java.util.Map instance
  - toJavaMap
```
protected <JM extends Map<K,Collection<V>>> JM toJavaMap(JM javaMap)
```

Class HashMultimap<K,V>

Nested Class Summary

Nested classes/interfaces inherited from interface io.vavr.collection.Multimap

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface io.vavr.collection.Multimap

Methods inherited from interface io.vavr.collection.Traversable

Methods inherited from interface io.vavr.collection.Foldable

Methods inherited from interface io.vavr.Value

Methods inherited from interface io.vavr.PartialFunction

Methods inherited from interface io.vavr.Function1

Field Detail

back

emptyContainer

Method Detail

withSeq

withSet

withSortedSet

withSortedSet

narrow

emptyMapSupplier

emptyInstance

createFromMap

asMap

bimap

containsKey

getContainerType

flatMap

get

getOrElse

keySet

map

mapValues

put

put

remove

remove

removeAll

size

values

distinct

distinctBy

distinctBy

drop

dropRight

dropUntil

dropWhile

filter

reject

filter

reject

filterKeys

rejectKeys

filterValues

rejectValues

removeAll

removeKeys

removeValues

groupBy

grouped

init

head

initOption

isAsync

isEmpty

isLazy

iterator

last

merge

merge

orElse

orElse

partition

peek

replace

replaceAll

replaceValue

replace

replaceAll