Answer / upendra sharma

collection is interface but collections is class

Answer / pavan kumar

collection is an interface to represent a group of individual object as a single entity.where as collections is an utility class to define several utility methods for collection implemented class objects

Answer / zaheer ahmed

"You can so easily mistake "Collections" for "Collection"—be careful.
Keep in mind that Collections is a class, with static utility methods, while Collection
is an interface with declarations of the methods common to most collections
including add(), remove(), contains(), size(), and iterator()"

Reference:
Mc Graw Hill - SCJP Sun Certified Programmer for Java 6 Exam 310-065 (2008)Page 559

Answer / nirmal kanna s

The Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.

The Collection interface defines methods common to structures which hold other objects. List and Set are subinterfaces of Collection, and ArrayList and HashSet are examples of concrete collections.

Collection : The root interface of Java Collections Framework.

Collections : A utility class that is a member of the Java Collections Framework.

Answer / devraj

Collection is an root interface for collection framework and
implemented by collection classes like List,Set ...etc
Whereas Collections is class which contains static methods
to operate on collection classess
EX:
List l=New ArrayList();
l.add("dev");
l.add("raj");
l.add("dev");
l.add("raj");
l.add("dev");
l.add("raj");
now i want to know no of dev in List
like fallowing
System.out.println(Collections.frequency(l,"dev"));

Answer / sanjay

Collection is an interface while Collections is a utility class.

Answer / umesh kumar samal

Collection
-----------
Collection is a interface these hold all sub interface like set ,list,map that is like herichy and to in one root
Collections
-------------
Collections is a class user property these are using in all collection class in sorting the element in a proper order
Collections.sort(obj ref);

Answer / haribabu kommi

collections is an Utility class.collection is an interface
which implemented by all other interfaces like set,map,list..

Answer / vijay bhupathi

Collections is a utility class having static methods(ex.sort).
Collection is an interface which Set,List and Queue
extend.(just extend,there are no direct implementations of
Collection)

Answer / rajyalakshmi vedapalli

collection is a interface and collections are utility
classes and the collections are the member in
collectionsframework(readymade datastructure)

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