K - the type of the keys in this mapV - the type of the values in this mappublic 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<Map.Entry<K,V>> |
entrySet() |
Set<K> |
keySet() |
MapIterator<K,V> |
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<? extends K,? extends V> mapToCopy) |
V |
remove(Object key) |
static <K,V> Map<K,V> |
unmodifiableMap(Map<? extends K,? extends V> map)
Factory method to create an unmodifiable map.
|
Collection<V> |
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 typeV - the value typemap - the map to decorate, must not be nullNullPointerException - if map is nullpublic void clear()
public V put(K key, V value)
Putput in interface Map<K,V>put in interface Put<K,V>put in class AbstractMapDecorator<K,V>key - key with which the specified value is to be associatedvalue - value to be associated with the specified keykey, or
null if there was no mapping for key.
(A null return can also indicate that the map
previously associated null with key,
if the implementation supports null values.)Map.put(Object, Object)public V remove(Object key)
remove in interface Map<K,V>remove in interface Get<K,V>remove in class AbstractMapDecorator<K,V>key - key whose mapping is to be removed from the mapkey, or
null if there was no mapping for key.Map.remove(Object)public MapIterator<K,V> mapIterator()
AbstractIterableMapMapIterator 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<String,Integer> map = new HashedMap<String,Integer>();
MapIterator<String,Integer> 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>Copyright © 2001–2019 The Apache Software Foundation. All rights reserved.