HashMap

java.lang.Object
- jade.util.leap.HashMap

All Implemented Interfaces:

Map, Serializable
```
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:

0.9

Author:

Nicolas Lhuillier

See Also:

HashMap, Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`private Hashtable`	`hiddenMap`
`private Set`	`keySet` Proxy to the realHiddenMap keys Set
`private static Long`	`nullValue`
`private Map`	`realHiddenMap`
`private static long`	`serialVersionUID` The following elements are required to ensure compatibility with the J2ME version of this class in serialization/deserialization operations.
`private Collection`	`values` Proxy to the realHiddenMap values Collection

Constructor Summary

Constructors
Constructor and 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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and 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.
`private Map`	`getData()`
`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).
`private void`	`readObject(ObjectInputStream in)` A customized readObject() method is needed to ensure compatibility with the J2ME version of this class in serialization/deserialization operations
`Object`	`remove(Object o)` Removes the mapping for this key from this map if present (optional operation).
`private void`	`setData(Map data)`
`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.
`private void`	`writeObject(ObjectOutputStream out)` A customized writeObject() method is needed to ensure compatibility with the J2ME version of this class in serialization/deserialization operations

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - realHiddenMap
```
private transient Map realHiddenMap
```
  - keySet
```
private transient Set keySet
```
    Proxy to the realHiddenMap keys Set
  - values
```
private transient Collection values
```
    Proxy to the realHiddenMap values Collection
  - serialVersionUID
```
private static final long serialVersionUID
```
    The following elements are required to ensure compatibility with the J2ME version of this class in serialization/deserialization operations.
    
    See Also:
    
    Constant Field Values
  - nullValue
```
private static final Long nullValue
```
  - hiddenMap
```
private Hashtable hiddenMap
```
- 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
  - writeObject
```
private void writeObject(ObjectOutputStream out)
                  throws IOException
```
    A customized writeObject() method is needed to ensure compatibility with the J2ME version of this class in serialization/deserialization operations
    
    Throws:
    
    IOException
  - readObject
```
private void readObject(ObjectInputStream in)
                 throws IOException,
                        ClassNotFoundException
```
    A customized readObject() method is needed to ensure compatibility with the J2ME version of this class in serialization/deserialization operations
    
    Throws:
    
    IOException
    
    ClassNotFoundException
  - setData
```
private void setData(Map data)
```
  - getData
```
private Map getData()
```

Class HashMap

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

realHiddenMap

keySet

values

serialVersionUID

nullValue

hiddenMap

Constructor Detail

HashMap

HashMap

HashMap

Method Detail

isEmpty

remove

put

get

size

containsKey

clear

toString

keySet

values

writeObject

readObject

setData

getData