ImmutableMap (Guava: Google Core Libraries for Java 23.0 API)

java.lang.Object
- com.google.common.collect.ImmutableMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>

Direct Known Subclasses:

ImmutableBiMap, ImmutableSortedMap
```
@GwtCompatible(serializable=true,
               emulated=true)
public abstract class ImmutableMap<K,V>
extends Object
implements Map<K,V>, Serializable
```
A Map whose contents will never change, with many other important properties detailed at ImmutableCollection.
See the Guava User Guide article on immutable collections.

Since:

2.0

Author:

Jesse Wilson, Kevin Bourrillion

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`ImmutableMap.Builder<K,V>` A builder for creating immutable map instances, especially `public static final` maps ("constant maps").

Nested classes/interfaces inherited from interface java.util.Map
Map.Entry<K,V>

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`ImmutableSetMultimap<K,V>`	`asMultimap()` Returns a multimap view of the map.
`static <K,V> ImmutableMap.Builder<K,V>`	`builder()` Returns a new builder.
`void`	`clear()` Deprecated. Unsupported operation.
`V`	`compute(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)` Deprecated. Unsupported operation.
`V`	`computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction)` Deprecated. Unsupported operation.
`V`	`computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)` Deprecated. Unsupported operation.
`boolean`	`containsKey(Object key)`
`boolean`	`containsValue(Object value)`
`static <K,V> ImmutableMap<K,V>`	`copyOf(Iterable<? extends Map.Entry<? extends K,? extends V>> entries)` Returns an immutable map containing the specified entries.
`static <K,V> ImmutableMap<K,V>`	`copyOf(Map<? extends K,? extends V> map)` Returns an immutable map containing the same entries as `map`.
`ImmutableSet<Map.Entry<K,V>>`	`entrySet()` Returns an immutable set of the mappings in this map.
`boolean`	`equals(Object object)`
`abstract V`	`get(Object key)`
`V`	`getOrDefault(Object key, V defaultValue)`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`ImmutableSet<K>`	`keySet()` Returns an immutable set of the keys in this map, in the same order that they appear in `entrySet`.
`V`	`merge(K key, V value, BiFunction<? super V,? super V,? extends V> remappingFunction)` Deprecated. Unsupported operation.
`static <K,V> ImmutableMap<K,V>`	`of()` Returns the empty map.
`static <K,V> ImmutableMap<K,V>`	`of(K k1, V v1)` Returns an immutable map containing a single entry.
`static <K,V> ImmutableMap<K,V>`	`of(K k1, V v1, K k2, V v2)` Returns an immutable map containing the given entries, in order.
`static <K,V> ImmutableMap<K,V>`	`of(K k1, V v1, K k2, V v2, K k3, V v3)` Returns an immutable map containing the given entries, in order.
`static <K,V> ImmutableMap<K,V>`	`of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4)` Returns an immutable map containing the given entries, in order.
`static <K,V> ImmutableMap<K,V>`	`of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5)` Returns an immutable map containing the given entries, in order.
`V`	`put(K k, V v)` Deprecated. Unsupported operation.
`void`	`putAll(Map<? extends K,? extends V> map)` Deprecated. Unsupported operation.
`V`	`putIfAbsent(K key, V value)` Deprecated. Unsupported operation.
`V`	`remove(Object o)` Deprecated. Unsupported operation.
`boolean`	`remove(Object key, Object value)` Deprecated. Unsupported operation.
`V`	`replace(K key, V value)` Deprecated. Unsupported operation.
`boolean`	`replace(K key, V oldValue, V newValue)` Deprecated. Unsupported operation.
`void`	`replaceAll(BiFunction<? super K,? super V,? extends V> function)` Deprecated. Unsupported operation.
`static <T,K,V> Collector<T,?,ImmutableMap<K,V>>`	`toImmutableMap(Function<? super T,? extends K> keyFunction, Function<? super T,? extends V> valueFunction)` Returns a `Collector` that accumulates elements into an `ImmutableMap` whose keys and values are the result of applying the provided mapping functions to the input elements.
`static <T,K,V> Collector<T,?,ImmutableMap<K,V>>`	`toImmutableMap(Function<? super T,? extends K> keyFunction, Function<? super T,? extends V> valueFunction, BinaryOperator<V> mergeFunction)` Returns a `Collector` that accumulates elements into an `ImmutableMap` whose keys and values are the result of applying the provided mapping functions to the input elements.
`String`	`toString()`
`ImmutableCollection<V>`	`values()` Returns an immutable collection of the values in this map, in the same order that they appear in `entrySet`.

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

Methods inherited from interface java.util.Map
forEach, size

- Method Detail
  - toImmutableMap
```
@Beta
public static <T,K,V> Collector<T,?,ImmutableMap<K,V>> toImmutableMap(Function<? super T,? extends K> keyFunction,
                                                                            Function<? super T,? extends V> valueFunction)
```
    Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements. Entries appear in the result ImmutableMap in encounter order.
    If the mapped keys contain duplicates (according to Object.equals(Object), an IllegalArgumentException is thrown when the collection operation is performed. (This differs from the Collector returned by Collectors.toMap(Function, Function), which throws an IllegalStateException.)
    
    Since:
    
    21.0
  - toImmutableMap
```
@Beta
public static <T,K,V> Collector<T,?,ImmutableMap<K,V>> toImmutableMap(Function<? super T,? extends K> keyFunction,
                                                                            Function<? super T,? extends V> valueFunction,
                                                                            BinaryOperator<V> mergeFunction)
```
    Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements.
    If the mapped keys contain duplicates (according to Object.equals(Object)), the values are merged using the specified merging function. Entries will appear in the encounter order of the first occurrence of the key.
    
    Since:
    
    21.0
  - of
```
public static <K,V> ImmutableMap<K,V> of()
```
    Returns the empty map. This map behaves and performs comparably to Collections.emptyMap(), and is preferable mainly for consistency and maintainability of your code.
  - of
```
public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1)
```
    Returns an immutable map containing a single entry. This map behaves and performs comparably to Collections.singletonMap(K, V) but will not accept a null key or value. It is preferable mainly for consistency and maintainability of your code.
  - of
```
public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2)
```
    Returns an immutable map containing the given entries, in order.
    
    Throws:
    
    IllegalArgumentException - if duplicate keys are provided
  - of
```
public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3)
```
    Returns an immutable map containing the given entries, in order.
    
    Throws:
    
    IllegalArgumentException - if duplicate keys are provided
  - of
```
public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3,
                                         K k4,
                                         V v4)
```
    Returns an immutable map containing the given entries, in order.
    
    Throws:
    
    IllegalArgumentException - if duplicate keys are provided
  - of
```
public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3,
                                         K k4,
                                         V v4,
                                         K k5,
                                         V v5)
```
    Returns an immutable map containing the given entries, in order.
    
    Throws:
    
    IllegalArgumentException - if duplicate keys are provided
  - builder
```
public static <K,V> ImmutableMap.Builder<K,V> builder()
```
    Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableMap.Builder constructor.
  - copyOf
```
public static <K,V> ImmutableMap<K,V> copyOf(Map<? extends K,? extends V> map)
```
    Returns an immutable map containing the same entries as map. The returned map iterates over entries in the same order as the entrySet of the original map. If map somehow contains entries with duplicate keys (for example, if it is a SortedMap whose comparator is not consistent with equals), the results of this method are undefined.
    Despite the method name, this method attempts to avoid actually copying the data when it is safe to do so. The exact circumstances under which a copy will or will not be performed are undocumented and subject to change.
    
    Throws:
    
    NullPointerException - if any key or value in map is null
  - copyOf
```
@Beta
public static <K,V> ImmutableMap<K,V> copyOf(Iterable<? extends Map.Entry<? extends K,? extends V>> entries)
```
    Returns an immutable map containing the specified entries. The returned map iterates over entries in the same order as the original iterable.
    
    Throws:
    
    NullPointerException - if any key, value, or entry is null
    
    IllegalArgumentException - if two entries have the same key
    
    Since:
    
    19.0
  - put
```
@Deprecated
public final V put(K k,
                               V v)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    put in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - putIfAbsent
```
@Deprecated
public final V putIfAbsent(K key,
                                       V value)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    putIfAbsent in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - replace
```
@Deprecated
public final boolean replace(K key,
                                         V oldValue,
                                         V newValue)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    replace in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - replace
```
@Deprecated
public final V replace(K key,
                                   V value)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    replace in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - computeIfAbsent
```
@Deprecated
public final V computeIfAbsent(K key,
                                           Function<? super K,? extends V> mappingFunction)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    computeIfAbsent in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - computeIfPresent
```
@Deprecated
public final V computeIfPresent(K key,
                                            BiFunction<? super K,? super V,? extends V> remappingFunction)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    computeIfPresent in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - compute
```
@Deprecated
public final V compute(K key,
                                   BiFunction<? super K,? super V,? extends V> remappingFunction)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    compute in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - merge
```
@Deprecated
public final V merge(K key,
                                 V value,
                                 BiFunction<? super V,? super V,? extends V> remappingFunction)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    merge in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - putAll
```
@Deprecated
public final void putAll(Map<? extends K,? extends V> map)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    putAll in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - replaceAll
```
@Deprecated
public final void replaceAll(BiFunction<? super K,? super V,? extends V> function)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    replaceAll in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - remove
```
@Deprecated
public final V remove(Object o)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    remove in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - remove
```
@Deprecated
public final boolean remove(Object key,
                                        Object value)
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    remove in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - clear
```
@Deprecated
public final void clear()
```
    Deprecated. Unsupported operation.
    
    Guaranteed to throw an exception and leave the map unmodified.
    
    Specified by:
    
    clear in interface Map<K,V>
    
    Throws:
    
    UnsupportedOperationException - always
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Map<K,V>
  - containsKey
```
public boolean containsKey(@Nullable
                           Object key)
```
    Specified by:
    
    containsKey in interface Map<K,V>
  - containsValue
```
public boolean containsValue(@Nullable
                             Object value)
```
    Specified by:
    
    containsValue in interface Map<K,V>
  - get
```
public abstract V get(@Nullable
                      Object key)
```
    Specified by:
    
    get in interface Map<K,V>
  - getOrDefault
```
public final V getOrDefault(@Nullable
                            Object key,
                            @Nullable
                            V defaultValue)
```
    Specified by:
    
    getOrDefault in interface Map<K,V>
  - entrySet
```
public ImmutableSet<Map.Entry<K,V>> entrySet()
```
    Returns an immutable set of the mappings in this map. The iteration order is specified by the method used to create this map. Typically, this is insertion order.
    
    Specified by:
    
    entrySet in interface Map<K,V>
  - keySet
```
public ImmutableSet<K> keySet()
```
    Returns an immutable set of the keys in this map, in the same order that they appear in entrySet.
    
    Specified by:
    
    keySet in interface Map<K,V>
  - values
```
public ImmutableCollection<V> values()
```
    Returns an immutable collection of the values in this map, in the same order that they appear in entrySet.
    
    Specified by:
    
    values in interface Map<K,V>
  - asMultimap
```
public ImmutableSetMultimap<K,V> asMultimap()
```
    Returns a multimap view of the map.
    
    Since:
    
    14.0
  - equals
```
public boolean equals(@Nullable
                      Object object)
```
    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 ImmutableMap<K,V>

Nested Class Summary

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

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Map

Method Detail

toImmutableMap

toImmutableMap

of

of

of

of

of

of

builder

copyOf

copyOf

put

putIfAbsent

replace

replace

computeIfAbsent

computeIfPresent

compute

merge

putAll

replaceAll

remove

remove

clear

isEmpty

containsKey

containsValue

get

getOrDefault

entrySet

keySet

values

asMultimap

equals

hashCode

toString