ImmutableMap

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
```
An immutable, hash-based Map with reliable user-specified iteration order. Does not permit null keys or values.
Unlike Collections.unmodifiableMap(java.util.Map<? extends K, ? extends V>), which is a view of a separate map which can still change, an instance of ImmutableMap contains its own data and will never change. ImmutableMap is convenient for public static final maps ("constant maps") and also lets you easily make a "defensive copy" of a map provided to your class by a caller.

Performance notes: unlike HashMap, ImmutableMap is not optimized for element types that have slow Object.equals(java.lang.Object) or Object.hashCode() implementations. You can get better performance by having your element type cache its own hash codes, and by making use of the cached values to short-circuit a slow equals algorithm.

See the Guava User Guide article on immutable collections.

Since:

2.0 (imported from Google Collections Library)

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.
`boolean`	`containsKey(Object key)`
`boolean`	`containsValue(Object value)`
`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)`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`ImmutableSet<K>`	`keySet()` Returns an immutable set of the keys in this map.
`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`	`remove(Object o)` Deprecated. Unsupported operation.
`String`	`toString()`
`ImmutableCollection<V>`	`values()` Returns an immutable collection of the values in this map.

Methods inherited from class java.lang.Object
clone, 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, size

- Method Detail
  - 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. 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
  - 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
  - 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
  - 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
  - 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()
```
  - containsKey
```
public boolean containsKey(Object key)
```
  - containsValue
```
public boolean containsValue(Object value)
```
  - get
```
public abstract V get(Object key)
```
  - entrySet
```
public ImmutableSet<Map.Entry<K,V>> entrySet()
```
    Returns an immutable set of the mappings in this map. The entries are in the same order as the parameters used to build this map.
  - keySet
```
public ImmutableSet<K> keySet()
```
    Returns an immutable set of the keys in this map. These keys are in the same order as the parameters used to build this map.
  - values
```
public ImmutableCollection<V> values()
```
    Returns an immutable collection of the values in this map. The values are in the same order as the parameters used to build this map.
  - asMultimap
```
@Beta
public ImmutableSetMultimap<K,V> asMultimap()
```
    Returns a multimap view of the map.
    
    Since:
    
    14.0
  - equals
```
public boolean equals(Object object)
```
  - hashCode
```
public int hashCode()
```
  - toString
```
public String toString()
```

Class ImmutableMap<K,V>

Nested Class Summary

Nested Classes

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

of

of

of

of

of

of

builder

copyOf

put

remove

putAll

clear

isEmpty

containsKey

containsValue

get

entrySet

keySet

values

asMultimap

equals

hashCode

toString