Collection is a root
level interface of the Java Collection Framework. Most of the classes in Java
Collection Framework implements from this interface. List, Set and Queue are
main sub interfaces of this interface. JDK doesn’t provide any direct
implementations of this interface. But, JDK provides direct implementations of
it’s sub interfaces. ArrayList, Vector, HashSet, LinkedHashSet, PriorityQueue
are some indirect implementations of Collection interface. Map interface, which
is also a part of java collection framework, doesn’t inherit from Collection
interface. Collection interface is a member of java.util package.
Collections is an utility class in java.util
package. It consists of only static methods which are used to operate on
objects of type Collection. For example, it has the method to find the maximum
element in a collection, it has the method to sort the collection, it has the
method to search for a particular element in a collection. Below is the list of
some important methods of Collections class.
Collections.max()
Collections.min()
Collections.sort()
Collections.synchronizedCollection()
Thanks & Regards:
Trilochan Tarai
9439202111
