public class Hashtable extends Object
Constructor and Description |
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Hashtable()
Constructs a new, empty hashtable with a default capacity and load
factor.
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Hashtable(int initialCapacity)
Constructs a new, empty hashtable with the specified initial capacity
and default load factor.
|
Hashtable(int initialCapacity,
float loadFactor)
Constructs a new, empty hashtable with the specified initial
capacity and the specified load factor.
|
Modifier and Type | Method and Description |
---|---|
void |
clear()
Clears this hashtable so that it contains no keys.
|
boolean |
contains(Object value)
Tests if some key maps into the specified value in this hashtable.
|
boolean |
containsKey(Object key)
Tests if the specified object is a key in this hashtable.
|
Enumeration |
elements()
Returns an enumeration of the values in this hashtable.
|
Object |
get(Object key)
Returns the value to which the specified key is mapped in this hashtable.
|
boolean |
isEmpty()
Tests if this hashtable maps no keys to values.
|
Enumeration |
keys()
Returns an enumeration of the keys in this hashtable.
|
Object |
put(Object key,
Object value)
Maps the specified
key to the specified
value in this hashtable. |
protected void |
rehash()
Rehashes the contents of the hashtable into a hashtable with a
larger capacity.
|
Object |
remove(Object key)
Removes the key (and its corresponding value) from this
hashtable.
|
int |
size()
Returns the number of keys in this hashtable.
|
String |
toString()
Returns a rather long string representation of this hashtable.
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public Hashtable(int initialCapacity, float loadFactor)
public Hashtable(int initialCapacity)
public Hashtable()
public int size()
public boolean isEmpty()
public Enumeration keys()
public Enumeration elements()
public boolean contains(Object value)
containsKey
method.public boolean containsKey(Object key)
public Object get(Object key)
protected void rehash()
public Object put(Object key, Object value)
key
to the specified
value
in this hashtable. Neither the key nor the
value can be null
.
The value can be retrieved by calling the get
method
with a key that is equal to the original key.
public Object remove(Object key)
public void clear()
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