HashMap Vs HashTable Vs TreeMap Vs LinkedHashMap

from http://vidyapsi.wordpress.com/2009/01/22/hashmap-vs-hashtable-vs-treemap-vs-linkedhashmap/

HashMap Vs HashTable Vs TreeMap Vs LinkedHashMap

Posted by vidya on January 22, 2009

HashMap	HashTable	TreeMap	LinkedHashMap
public class HashMap<K,V> extends AbstractMap<K,V> implements Map<K,V>,  Cloneable,  Serializable	public class Hashtable<K,V> extends Dictionary<K,V> implements Map<K,V>,  Cloneable,  Serializable	public class TreeMap<K,V> extends AbstractMap<K,V> implements  NavigableMap<K,V>, Cloneable,  Serializable	public class LinkedHashMap<K,V> extends HashMap<K,V> implements Map<K,V>
Unidentified Order	Decending Order	Ascending Order	Insertion Order
UnSynchronized	Synchronized	UnSynchronized	UnSynchronized
The values can be null. But the key should be unique	does not let you have null value for key.	The values can be null. But the key should be unique	The values can be null. But the key should be unique

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