Java HashMap Tutorial with Example program
By candid | Posted :
Dec 11, 2015
| Updated :
Dec 11, 2015
Class HashMap
Type Parameters:
K - the type of keys maintained by this map
V - the type of mapped values
All Implemented Interfaces:
Serializable, Cloneable, Map
Direct Known Subclasses:
LinkedHashMap, PrinterStateReasons
public class HashMap
extends AbstractMap
implements Map, Cloneable, Serializable
{
//
}
Since:
1.2
See Also:
Object.hashCode(), Collection, Map, TreeMap, Hashtable, Serialized Form
Nested classes/interfaces inherited from class java.util.AbstractMap
AbstractMap.SimpleEntry, AbstractMap.SimpleImmutableEntry
Constructor summary
HashMap()
Constructs an empty HashMap with the default initial capacity (16) and the default load factor (0.75).
HashMap(int initialCapacity)
Constructs an empty HashMap with the specified initial capacity and the default load factor (0.75).
HashMap(int initialCapacity, float loadFactor)
Constructs an empty HashMap with the specified initial capacity and load factor.
HashMap(Map m)
Constructs a new HashMap with the same mappings as the specified Map.
Methods Summary
Removes all of the mappings from this map.
Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
Returns true if this map contains a mapping for the specified key.
Returns true if this map maps one or more keys to the specified value.
Returns a Set view of the mappings contained in this map.
Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
Returns true if this map contains no key-value mappings.
Returns a Set view of the keys contained in this map.
Associates the specified value with the specified key in this map.
Copies all of the mappings from the specified map to this map.
Removes the mapping for the specified key from this map if present.
Returns the number of key-value mappings in this map.
Returns a Collection view of the values contained in this map.
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait,equals, hashCode, toString
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