Package jade.util.leap

Class HashMap

java.lang.Object

jade.util.leap.HashMap

All Implemented Interfaces:

Map, Serializable, Serializable

Direct Known Subclasses:

DataStore

public class HashMap
extends Object
implements Map, Serializable

The LEAP (environment-dependent) version of the &qote;java.util.HashMap&qote; class. This class appears to be exactly the same in J2SE, PJAVA and MIDP. The internal implementation is different in the three cases however.

Version:

1.0, 29/09/00

Author:

Nicolas Lhuillier

See Also:

HashMap, Serialized Form

Constructor Summary

Constructors

Constructor	Description
HashMap()	Default constructor, creates a new empty Map
HashMap(int s)	Constructor, creates a new Map with initial size
HashMap(int s, float lf)	Constructor, creates a new Map with initial size and load factor

Method Summary

Modifier and Type	Method	Description
void	clear()	Remove all mappings from this map.
boolean	containsKey(Object key)	Returns true if this map contains a mapping for the specified key.
Object	get(Object key)	Returns the value to which this map maps the specified key.
boolean	isEmpty()	Returns true if this map contains no key-value mappings.
Set	keySet()	Returns a set view of the keys contained in this map.
Object	put(Object key, Object value)	Associates the specified value with the specified key in this map (optional operation).
Object	remove(Object o)	Removes the mapping for this key from this map if present (optional operation).
int	size()	Returns the number of mappings in this map.
String	toString()
Collection	values()	Returns a Collection view of the values contained in this map.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

HashMap

public HashMap()

Default constructor, creates a new empty Map

HashMap

public HashMap(int s)

Constructor, creates a new Map with initial size

HashMap

public HashMap(int s,
               float lf)

Constructor, creates a new Map with initial size and load factor

Method Detail

isEmpty

public boolean isEmpty()

Description copied from interface: Map

Returns true if this map contains no key-value mappings.

Specified by:

isEmpty in interface Map

Returns:

true if this map contains no key-value mappings.

See Also:

interface

remove

public Object remove(Object o)

Description copied from interface: Map

Removes the mapping for this key from this map if present (optional operation).

Specified by:

remove in interface Map

Parameters:

o - key whose mapping is to be removed from the map.

Returns:

previous value associated with specified key, or null if there was no mapping for key.

See Also:

interface

put

public Object put(Object key,
                  Object value)

Description copied from interface: Map

Associates the specified value with the specified key in this map (optional operation).

Specified by:

put in interface Map

Parameters:

key - key with which the specified value is to be associated.

value - value to be associated with the specified key.

Returns:

previous value associated with specified key, or null if there was no mapping for key.

See Also:

interface

get

public Object get(Object key)

Description copied from interface: Map

Returns the value to which this map maps the specified key. Returns null if the map contains no mapping for this key.

Specified by:

get in interface Map

Parameters:

key - key whose associated value is to be returned.

Returns:

the value to which this map maps the specified key, or null if the map contains no mapping for this key.

See Also:

interface

size

public int size()

Description copied from interface: Map

Returns the number of mappings in this map.

Specified by:

size in interface Map

See Also:

interface

containsKey

public boolean containsKey(Object key)

Description copied from interface: Map

Returns true if this map contains a mapping for the specified key.

Specified by:

containsKey in interface Map

Parameters:

key - key whose presence in this map is to be tested.

Returns:

true if this map contains a mapping for the specified key.

See Also:

interface

clear

public void clear()

Description copied from interface: Map

Remove all mappings from this map.

Specified by:

clear in interface Map

See Also:

interface

toString

public String toString()

Overrides:

toString in class Object

keySet

public Set keySet()

Description copied from interface: Map

Returns a set view of the keys contained in this map.

Specified by:

keySet in interface Map

Returns:

a set view of the keys contained in this map.

See Also:

interface

values

public Collection values()

Description copied from interface: Map

Returns a Collection view of the values contained in this map.

Specified by:

values in interface Map

Returns:

the Collection of elements contained in this map.

See Also:

interface