Difference between Collection and Collections in Java

Collection - Interface

Collection is a base interface of the Java Collection Framework for List, Set and Queue.

Collections - class

Collections is a class in java.util package and it is utility class for Collection.

Collections class has methods for Sorting, Searching etc

Example

Collections.addAll(A,B); 

Collections.addAll method takes all of the elements of 'B' and fetch the elements to the collection 'A'

Collections.sort(A); 

Collections.sort method sorts the element of specified list 'A' in ascending order.

Reference

https://www.quora.com/What-are-the-main-differences-between-Collection-and-Collections-in-Java

https://www.geeksforgeeks.org/collections-sort-java-examples/