java.util

Class HashMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

Type Parameters:

K - key type

V - value type

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

Direct Known Subclasses:

LinkedHashMap

public class HashMap<K,V>
extends AbstractMap<K,V>
implements Cloneable, Serializable

Implementation of Map interface based on a hash table. [Sun docs]

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
HashMap()
HashMap(int ignored)
HashMap(int ignored, float alsoIgnored)
HashMap(Map<? extends K,? extends V> toBeCopied)

Method Summary

Modifier and Type	Method and Description
void	clear()
Object	clone()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
protected V	getStringValue(String key) Returns the value for the given key in the stringMap.
protected boolean	hasStringValue(String key) Returns true if the given key exists in the stringMap.
V	put(K key, V value)
protected V	putStringValue(String key, V value) Sets the specified key to the specified value in the stringMap.
V	remove(Object key)
protected V	removeStringValue(String key) Removes the specified key from the stringMap and returns the value that was previously there.
int	size()

Methods inherited from class java.util.AbstractMap

equals, hashCode, isEmpty, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

finalize, getClass

Constructor Detail

HashMap

public HashMap()

HashMap

public HashMap(int ignored)

HashMap

public HashMap(int ignored,
               float alsoIgnored)

HashMap

public HashMap(Map<? extends K,? extends V> toBeCopied)

Method Detail

clone

public Object clone()

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class AbstractMap<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class AbstractMap<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

Overrides:

containsValue in class AbstractMap<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in class AbstractMap<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

Overrides:

get in class AbstractMap<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class AbstractMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class AbstractMap<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

Overrides:

size in class AbstractMap<K,V>

getStringValue

protected V getStringValue(String key)

Returns the value for the given key in the stringMap. Returns null if the specified key does not exist.

hasStringValue

protected boolean hasStringValue(String key)

Returns true if the given key exists in the stringMap.

putStringValue

protected V putStringValue(String key,
                           V value)

Sets the specified key to the specified value in the stringMap. Returns the value previously at that key. Returns null if the specified key did not exist.

removeStringValue

protected V removeStringValue(String key)

Removes the specified key from the stringMap and returns the value that was previously there. Returns null if the specified key does not exist.