Constructor Summary | |
HashMap()
Constructs an empty HashMap with the default initial capacity (16) and the default load factor (0.75). |
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HashMap(int initialCapacity)
Constructs an empty HashMap with the specified initial capacity and the default load factor (0.75). |
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HashMap(int initialCapacity,
float loadFactor)
Constructs an empty HashMap with the specified initial capacity and load factor. |
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HashMap(Map m)
Constructs a new HashMap with the same mappings as the specified Map. |
Method Summary | |
void |
clear()
Removes all mappings from this map. |
Object |
clone()
Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned. |
boolean |
containsKey(Object key)
Returns true if this map contains a mapping for the specified key. |
boolean |
containsValue(Object value)
Returns true if this map maps one or more keys to the specified value. |
Set |
entrySet()
Returns a collection view of the mappings contained in this map. |
Object |
get(Object key)
Returns the value to which the specified key is mapped in this identity hash map, or null if the map contains no mapping for this key. |
boolean |
isEmpty()
Returns true if this map contains no key-value mappings. |
Set |
keySet()
Returns a set view of the keys contained in this map. |
Object |
put(Object key,
Object value)
Associates the specified value with the specified key in this map. |
void |
putAll(Map m)
Copies all of the mappings from the specified map to this map These mappings will replace any mappings that this map had for any of the keys currently in the specified map. |
Object |
remove(Object key)
Removes the mapping for this key from this map if present. |
int |
size()
Returns the number of key-value mappings in this map. |
Collection |
values()
Returns a collection view of the values contained in this map. |
Methods inherited from class java.util.AbstractMap |
equals, hashCode, toString |
Methods inherited from class java.lang.Object |
finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.Map |
equals, hashCode |