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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util

Source Cross Reference Class Diagram Java Document (Java Doc)

java.util .Hashtable

Hashtable
public class Hashtable extends Dictionary implements Map<K, V>,Cloneable,Serializable(Code)
	Hashtable associates keys with values. Keys and values cannot be null. The size of the Hashtable is the number of key/value pairs it contains. The capacity is the number of key/value pairs the Hashtable can hold. The load factor is a float value which determines how full the Hashtable gets before expanding the capacity. If the load factor of the Hashtable is exceeded, the capacity is doubled. See Also: Enumeration See Also: java.io.Serializable See Also: java.lang.Object.equals See Also: java.lang.Object.hashCode

Field Summary
transient int	elementCount
transient Entry<K, V>[]	elementData
transient int	firstSlot
transient int	lastSlot
transient int	modCount

Constructor Summary
public	Hashtable() Constructs a new Hashtable using the default capacity and load factor.
public	Hashtable(int capacity) Constructs a new Hashtable using the specified capacity and the default load factor.
public	Hashtable(int capacity, float loadFactor) Constructs a new Hashtable using the specified capacity and load factor.
public	Hashtable(Map<? extends K, ? extends V> map) Constructs a new instance of Hashtable containing the mappings from the specified Map.

Method Summary
public synchronized void	clear() Removes all key/value pairs from this Hashtable, leaving the size zero and the capacity unchanged.
public synchronized Object	clone() Answers a new Hashtable with the same key/value pairs, capacity and load factor.
public synchronized boolean	contains(Object value) Answers if this Hashtable contains the specified object as the value of at least one of the key/value pairs.
public synchronized boolean	containsKey(Object key) Answers if this Hashtable contains the specified object as a key of one of the key/value pairs.
public boolean	containsValue(Object value) Searches this Hashtable for the specified value.
public synchronized Enumeration<V>	elements() Answers an Enumeration on the values of this Hashtable.
public Set<Map.Entry<K, V>>	entrySet() Answers a Set of the mappings contained in this Hashtable.
public synchronized boolean	equals(Object object) Compares the specified object to this Hashtable and answer if they are equal.
public synchronized V	get(Object key) Answers the value associated with the specified key in this Hashtable.
Entry<K, V>	getEntry(Object key)
public synchronized int	hashCode() Answers an integer hash code for the receiver.
public synchronized boolean	isEmpty() Answers if this Hashtable has no key/value pairs, a size of zero.
public Set<K>	keySet() Answers a Set of the keys contained in this Hashtable.
public synchronized Enumeration<K>	keys() Answers an Enumeration on the keys of this Hashtable.
public synchronized V	put(K key, V value) Associate the specified value with the specified key in this Hashtable. If the key already exists, the old value is replaced.
public synchronized void	putAll(Map<? extends K, ? extends V> map) Copies every mapping in the specified Map to this Hashtable.
protected void	rehash() Increases the capacity of this Hashtable.
public synchronized V	remove(Object key) Remove the key/value pair with the specified key from this Hashtable.
public synchronized int	size() Answers the number of key/value pairs in this Hashtable.
public synchronized String	toString() Answers the string representation of this Hashtable.
public Collection<V>	values() Answers a Collection of the values contained in this Hashtable.

Field Detail

elementCount
transient int elementCount(Code)

elementData
transient Entry<K, V>[] elementData(Code)

firstSlot
transient int firstSlot(Code)

lastSlot
transient int lastSlot(Code)

modCount
transient int modCount(Code)

Constructor Detail

Hashtable
public Hashtable()(Code)
	Constructs a new Hashtable using the default capacity and load factor.

Hashtable
public Hashtable(int capacity)(Code)
	Constructs a new Hashtable using the specified capacity and the default load factor. Parameters: capacity - the initial capacity

Hashtable
public Hashtable(int capacity, float loadFactor)(Code)
	Constructs a new Hashtable using the specified capacity and load factor. Parameters: capacity - the initial capacity Parameters: loadFactor - the initial load factor

Hashtable
public Hashtable(Map<? extends K, ? extends V> map)(Code)
	Constructs a new instance of Hashtable containing the mappings from the specified Map. Parameters: map - the mappings to add

Method Detail

clear
public synchronized void clear()(Code)
	Removes all key/value pairs from this Hashtable, leaving the size zero and the capacity unchanged. See Also: Hashtable.isEmpty See Also: Hashtable.size

clone
public synchronized Object clone()(Code)
	Answers a new Hashtable with the same key/value pairs, capacity and load factor. a shallow copy of this Hashtable See Also: java.lang.Cloneable

contains
public synchronized boolean contains(Object value)(Code)
	Answers if this Hashtable contains the specified object as the value of at least one of the key/value pairs. Parameters: value - the object to look for as a value in this Hashtable true if object is a value in this Hashtable, false otherwise See Also: Hashtable.containsKey See Also: java.lang.Object.equals

containsKey
public synchronized boolean containsKey(Object key)(Code)
	Answers if this Hashtable contains the specified object as a key of one of the key/value pairs. Parameters: key - the object to look for as a key in this Hashtable true if object is a key in this Hashtable, false otherwise See Also: Hashtable.contains See Also: java.lang.Object.equals

containsValue
public boolean containsValue(Object value)(Code)
	Searches this Hashtable for the specified value. Parameters: value - the object to search for true if `value` is a value of this Hashtable, falseotherwise

elements
public synchronized Enumeration<V> elements()(Code)
	Answers an Enumeration on the values of this Hashtable. The results of the Enumeration may be affected if the contents of this Hashtable are modified. an Enumeration of the values of this Hashtable See Also: Hashtable.keys See Also: Hashtable.size See Also: Enumeration

entrySet
public Set<Map.Entry<K, V>> entrySet()(Code)
	Answers a Set of the mappings contained in this Hashtable. Each element in the set is a Map.Entry. The set is backed by this Hashtable so changes to one are reflected by the other. The set does not support adding. a Set of the mappings

equals
public synchronized boolean equals(Object object)(Code)
	Compares the specified object to this Hashtable and answer if they are equal. The object must be an instance of Map and contain the same key/value pairs. Parameters: object - the object to compare with this object true if the specified object is equal to this Map, falseotherwise See Also: Hashtable.hashCode

get
public synchronized V get(Object key)(Code)
	Answers the value associated with the specified key in this Hashtable. Parameters: key - the key of the value returned the value associated with the specified key, null if thespecified key does not exist See Also: Hashtable.put

getEntry
Entry<K, V> getEntry(Object key)(Code)

hashCode
public synchronized int hashCode()(Code)
	Answers an integer hash code for the receiver. Objects which are equal answer the same value for this method. the receiver's hash See Also: Hashtable.equals

isEmpty
public synchronized boolean isEmpty()(Code)
	Answers if this Hashtable has no key/value pairs, a size of zero. true if this Hashtable has no key/value pairs, false otherwise See Also: Hashtable.size

keySet
public Set<K> keySet()(Code)
	Answers a Set of the keys contained in this Hashtable. The set is backed by this Hashtable so changes to one are reflected by the other. The set does not support adding. a Set of the keys

keys
public synchronized Enumeration<K> keys()(Code)
	Answers an Enumeration on the keys of this Hashtable. The results of the Enumeration may be affected if the contents of this Hashtable are modified. an Enumeration of the keys of this Hashtable See Also: Hashtable.elements See Also: Hashtable.size See Also: Enumeration

put
public synchronized V put(K key, V value)(Code)
	Associate the specified value with the specified key in this Hashtable. If the key already exists, the old value is replaced. The key and value cannot be null. Parameters: key - the key to add Parameters: value - the value to add the old value associated with the specified key, null if the keydid not exist See Also: Hashtable.elements See Also: Hashtable.get See Also: Hashtable.keys See Also: java.lang.Object.equals

putAll
public synchronized void putAll(Map<? extends K, ? extends V> map)(Code)
	Copies every mapping in the specified Map to this Hashtable. Parameters: map - the Map to copy mappings from

rehash
protected void rehash()(Code)
	Increases the capacity of this Hashtable. This method is sent when the size of this Hashtable exceeds the load factor.

remove
public synchronized V remove(Object key)(Code)
	Remove the key/value pair with the specified key from this Hashtable. Parameters: key - the key to remove the value associated with the specified key, null if thespecified key did not exist See Also: Hashtable.get See Also: Hashtable.put

size
public synchronized int size()(Code)
	Answers the number of key/value pairs in this Hashtable. the number of key/value pairs in this Hashtable See Also: Hashtable.elements See Also: Hashtable.keys

toString
public synchronized String toString()(Code)
	Answers the string representation of this Hashtable. the string representation of this Hashtable

values
public Collection<V> values()(Code)
	Answers a Collection of the values contained in this Hashtable. The collection is backed by this Hashtable so changes to one are reflected by the other. The collection does not support adding. a Collection of the values

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