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Class Acme.IntHashtable

java.lang.Object
   |
   +----java.util.Dictionary
           |
           +----Acme.IntHashtable

public class IntHashtable

extends Dictionary

implements Cloneable

Use just like java.util.Hashtable, except that the keys must be ints. This is much faster than creating a new Integer for each access.

Fetch the software.
Fetch the entire Acme package.

See Also:

Hashtable

IntHashtable()

Constructs a new, empty hashtable.

IntHashtable(int)

Constructs a new, empty hashtable with the specified initial capacity.

IntHashtable(int, float)

Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

clear()

Clears the hash table so that it has no more elements in it.

clone()

Creates a clone of the hashtable.

contains(Object)

Returns true if the specified object is an element of the hashtable.

containsKey(int)

Returns true if the collection contains an element for the key.

elements()

Returns an enumeration of the elements.

get(int)

Gets the object associated with the specified key in the hashtable.

get(Object)

A get method that takes an Object, for compatibility with java.util.Dictionary.

isEmpty()

Returns true if the hashtable contains no elements.

keys()

Returns an enumeration of the hashtable's keys.

put(int, Object)

Puts the specified element into the hashtable, using the specified key.

put(Object, Object)

A put method that takes an Object, for compatibility with java.util.Dictionary.

rehash()

Rehashes the content of the table into a bigger table.

remove(int)

Removes the element corresponding to the key.

remove(Object)

A remove method that takes an Object, for compatibility with java.util.Dictionary.

size()

Returns the number of elements contained in the hashtable.

toString()

Converts to a rather lengthy String.

 public IntHashtable(int initialCapacity,
                     float loadFactor)

Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

Parameters:

initialCapacity - the initial number of buckets

loadFactor - a number between 0.0 and 1.0, it defines the threshold for rehashing the hashtable into a bigger one.

Throws: IllegalArgumentException

If the initial capacity is less than or equal to zero.

Throws: IllegalArgumentException

If the load factor is less than or equal to zero.

 public IntHashtable(int initialCapacity)

Constructs a new, empty hashtable with the specified initial capacity.

Parameters:

initialCapacity - the initial number of buckets

 public IntHashtable()

Constructs a new, empty hashtable. A default capacity and load factor is used. Note that the hashtable will automatically grow when it gets full.

 public int size()

Returns the number of elements contained in the hashtable.

Overrides:

size in class Dictionary

 public boolean isEmpty()

Returns true if the hashtable contains no elements.

Overrides:

isEmpty in class Dictionary

 public synchronized Enumeration keys()

Returns an enumeration of the hashtable's keys.

Overrides:

keys in class Dictionary

See Also:

elements

 public synchronized Enumeration elements()

Returns an enumeration of the elements. Use the Enumeration methods on the returned object to fetch the elements sequentially.

Overrides:

elements in class Dictionary

See Also:

keys

 public synchronized boolean contains(Object value)

Returns true if the specified object is an element of the hashtable. This operation is more expensive than the containsKey() method.

Parameters:

value - the value that we are looking for

Throws: NullPointerException

If the value being searched for is equal to null.

See Also:

containsKey

 public synchronized boolean containsKey(int key)

Returns true if the collection contains an element for the key.

Parameters:

key - the key that we are looking for

See Also:

contains

 public synchronized Object get(int key)

Gets the object associated with the specified key in the hashtable.

Parameters:

key - the specified key

Returns:

s the element for the key or null if the key is not defined in the hash table.

See Also:

put

 public Object get(Object okey)

A get method that takes an Object, for compatibility with java.util.Dictionary. The Object must be an Integer.

Overrides:

get in class Dictionary

 protected void rehash()

Rehashes the content of the table into a bigger table. This method is called automatically when the hashtable's size exceeds the threshold.

 public synchronized Object put(int key,
                                Object value)

Puts the specified element into the hashtable, using the specified key. The element may be retrieved by doing a get() with the same key. The key and the element cannot be null.

Parameters:

key - the specified key in the hashtable

value - the specified element

Returns:

the old value of the key, or null if it did not have one.

Throws: NullPointerException

If the value of the element is equal to null.

See Also:

get

 public Object put(Object okey,
                   Object value)

A put method that takes an Object, for compatibility with java.util.Dictionary. The Object must be an Integer.

Overrides:

put in class Dictionary

 public synchronized Object remove(int key)

Removes the element corresponding to the key. Does nothing if the key is not present.

Parameters:

key - the key that needs to be removed

Returns:

the value of key, or null if the key was not found.

 public Object remove(Object okey)

A remove method that takes an Object, for compatibility with java.util.Dictionary. The Object must be an Integer.

Overrides:

remove in class Dictionary

 public synchronized void clear()

Clears the hash table so that it has no more elements in it.

 public synchronized Object clone()

Creates a clone of the hashtable. A shallow copy is made, the keys and elements themselves are NOT cloned. This is a relatively expensive operation.

Overrides:

clone in class Object

 public synchronized String toString()

Converts to a rather lengthy String.

Overrides:

toString in class Object

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