Comparable vs Comparator

  Interface __Comparable__ contains method public int __compareTo(E a, E b)__ and is usually implemented in classes for natural
ordering or default ordering.

 Interface __Comparator__ contains method public int __compare(E a, E b)__ and is tailored for custom comparison and custom sorting
order.

 So, there are usually two methods for sorting collections, the first takes a collection only and sorts it using its in-built
__compareTo()__ for a given class that is already implemented.

 The other one takes two arguments, one of which is the collection and the second is the instance of Comparator,
whose compare method is used for custom sort. It is convenient to use __Comparator__ as a functional interface and define it
by a lambda or stack a priority of comparing values by using __Comparator().thenComparing(AnotherComparator())__;