Basic Collection Type Attributes and Characterists

You should be able to answer the following questions about each core Collection type

	Elements Ordered?	Allows Duplicates?	Elements Added/Removed in a Certain Order?	Allows Key/Values?
List	Yes - Numbered Index	Yes	No	No
Set	No	No	No	No
Queue	Yes - Placed Order	Yes	Yes	No
Map	No	Yes - Values only	No	Yes

Specific Collection Type Attributes and Characterists

You should be able to answer the following questions about each Collection implementation provided by Java

Java Type	Parent Interface Type	Allows null?	Elements Sorted?	Uses hashCode?	Uses compareTo?
ArrayList	List	Yes	No	No	No
LinkedList	List and Queue	Yes	No	No	No
HashSet	Set	Yes	No	Yes	No
TreeSet	Set	No	Yes	No	Yes
HashMap	Map	Yes	No	Yes	No
TreeMap	Map	No	Yes	No	Yes