com.google.gwt.dev.util.collect

Class HashMap<K,V>

java.lang.Object

com.google.gwt.dev.util.collect.HashMap<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Serializable, Map<K,V>

Direct Known Subclasses:

IdentityHashMap

public class HashMap<K,V>
extends Object
implements Map<K,V>, Serializable

A memory-efficient hash map.

See Also:

Serialized Form

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
HashMap()
HashMap(boolean stableWriteObject)
HashMap(Map<? extends K,? extends V> m)

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected void	doReadObject(ObjectInputStream in) Adapted from AbstractHashedMap.
protected void	doWriteObject(ObjectOutputStream out) Adapted from AbstractHashedMap.
Set<Map.Entry<K,V>>	entrySet()
boolean	equals(Object o)
V	get(Object key)
int	hashCode()
boolean	isEmpty()
protected boolean	keyEquals(Object a, Object b) Returns whether two keys are equal for the purposes of this set.
protected int	keyHashCode(Object k) Returns the hashCode for a key.
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object key)
int	size()
String	toString()
protected boolean	valueEquals(Object a, Object b) Returns whether two values are equal for the purposes of this set.
protected int	valueHashCode(Object v) Returns the hashCode for a value.
Collection<V>	values()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

HashMap

public HashMap()

HashMap

public HashMap(boolean stableWriteObject)

HashMap

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

Method Detail

clear

public void clear()

Specified by:

clear in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

entrySet

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

Specified by:

entrySet in interface Map<K,V>

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

toString

public String toString()

Overrides:

toString in class Object

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

doReadObject

protected void doReadObject(ObjectInputStream in)
                     throws IOException,
                            ClassNotFoundException

Adapted from AbstractHashedMap.

Throws:

IOException

ClassNotFoundException

doWriteObject

protected void doWriteObject(ObjectOutputStream out)
                      throws IOException

Adapted from AbstractHashedMap.

Throws:

IOException

keyEquals

protected boolean keyEquals(Object a,
                            Object b)

Returns whether two keys are equal for the purposes of this set.

keyHashCode

protected int keyHashCode(Object k)

Returns the hashCode for a key.

valueEquals

protected boolean valueEquals(Object a,
                              Object b)

Returns whether two values are equal for the purposes of this set.

valueHashCode

protected int valueHashCode(Object v)

Returns the hashCode for a value.