is collections.sort method only used for List type of collections?

Question

friends, I am new to Java-Collection. I want to ask does Collections.sort() method only used for/by collections which are List type. I was unable t

Answer 1

My first step with these questions is to look at Java's documentation, which will help you a lot in understanding and debugging things.

http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html

If you look at the sort method, there, it is expecting a List.

 sort(List list)

It has another overriden version, but this also needs a list, as well as a comparator.

 sort(List list, Comparator c)

This is why you are getting an error. There is not a method defined for sort (HashSet)