final Collection in java

An interesting aspect about final Collection that many java developers may not be familiar with is that making a collection final means only the reference cannot be changed but you can add, remove or change an object inside collection.

 

Example:

            private final List<String> names = new ArrayList<String>();

            names.add("Name1"); //Allowed

            names.add("Name2"); //Allowed

                       

            names = new ArrayList<String>(); //Error