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3) Set interface :
This can be used for representing a
group of individual objects where duplicate objects are not allowed and insertion
operation is not preserved.
This is the child interface of
collection
hashset and linkedHashSet are the
classes which implements Set interface directly.
4) SortedSet interface :
This can be used for representing a
group of individual and unique objects. Where all the objects are inserted in
some sorting order. It is the child interface of Set interface TreeSet is
the implemented class of SortedSet
5) Queue interface:
It is the child interface of
collection it has introduced in 1.5 version this interface can be used for representing
a group of individual objects prior to processing.
All the above interfaces(collection,
List, Set, SortedSet, Queue) can be used for representing a group of individual
objects. If u want to represent a group of
objects as key value pair than we can’t use above interfaces.
To handle this requirement sun
people has introduced map interface.
6) Map:
This can be used for representing a
group of objects as key value pairs. Both key and value are objects only.
StudentName à StudentRollNo
phoneNumber à contactdetails
word à meaning
IP Address à Domain-name
Map interface is not child interface
of collection.
7) SortedMap:
This can be used for representing a
group of objects as key value pairs where all the entries are arranged in some
sorting order of keys.
TreeMap is the class which
implements SortedMap interface.
The following are legacy Characters
in collection Frame Work.
TreeMap
1) vector.
2) stack
3) Hashtable Concrete classes
4) properties
5) Dictionary à abstract classes
6) Enumaration à interface
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