public final class UnmodifiableMap<K,V> extends AbstractMapDecorator<K ,V> implements Unmodifiable , Serializable
Map to ensure it can't be altered.
This class is Serializable from Commons Collections 3.1.
Attempts to modify it will result in an UnsupportedOperationException.
| Modifier and Type | Method and Description |
|---|---|
void |
clear()
|
Set |
entrySet()
|
Set |
keySet()
|
MapIterator |
mapIterator()
Obtains a
MapIterator over the map.
|
V |
put(K key, V value)
Note that the return type is Object, rather than V as in the Map interface.
|
void |
putAll(Map
|
V |
remove(Object
|
static <K |
unmodifiableMap(Map
Factory method to create an unmodifiable map.
|
Collection |
values()
|
containsKey, containsValue, decorated, equals, get, hashCode, isEmpty, size, toStringclone, finalize, getClass, notify, notifyAll, wait, wait, waitcompute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAllpublic static <K,V> Map <K ,V> unmodifiableMap(Map <? extends K ,? extends V> map)
K - the key type
V - the value type
map - the map to decorate, must not be null
NullPointerException - if map is null
public void clear()
public V put(K key, V value)
Put
public MapIterator<K ,V> mapIterator()
AbstractIterableMap
MapIterator over the map.
A map iterator is an efficient way of iterating over maps. There is no need to access the entry set or use Map Entry objects.
IterableMap
map = new HashedMap
(); MapIterator
it = map.mapIterator(); while (it.hasNext()) { String key = it.next(); Integer value = it.getValue(); it.setValue(value + 1); }
mapIterator in interface
IterableGet<K,V>
mapIterator in class
AbstractIterableMap<K,V>
public Collection<V> values()