org.ws4d.java.structures
Class HashMap

java.lang.Object
  org.ws4d.java.structures.HashMap

Direct Known Subclasses:

LinkedMap, LockedMap

public class HashMap
extends java.lang.Object

Class implements a map of keys associated with values. The speed of the hash map is linked to the quality of the hashCode() method of the key objects.

Nested Class Summary

static class

HashMap.Entry

Constructor Summary

HashMap()

HashMap(HashMap map)

HashMap(int initialCapacity)

Method Summary

void	clear()
boolean	containsKey(java.lang.Object obj)
boolean	containsValue(java.lang.Object obj)
Set	entrySet()
boolean	equals(java.lang.Object obj)
java.lang.Object	get(java.lang.Object key) Get associated value to given key.
int	hashCode()
boolean	isEmpty()
Set	keySet()
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
void	putAll(HashMap map)
java.lang.Object	remove(java.lang.Object key)
int	size()
java.lang.String	toString()
DataStructure	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

HashMap

public HashMap(int initialCapacity)

HashMap

public HashMap()

HashMap

public HashMap(HashMap map)

Method Detail

clear

public void clear()

containsKey

public boolean containsKey(java.lang.Object obj)

containsValue

public boolean containsValue(java.lang.Object obj)

get

public java.lang.Object get(java.lang.Object key)

Get associated value to given key. A key == null will always return null;

Parameters:

key - the key to lookup

Returns:

the value for the given key or null

isEmpty

public boolean isEmpty()

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

putAll

public void putAll(HashMap map)

remove

public java.lang.Object remove(java.lang.Object key)

size

public int size()

entrySet

public Set entrySet()

keySet

public Set keySet()

values

public DataStructure values()

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object