Frequently, we may have an ArrayList which stores many values, and we need to process the ArrayList and get what are the distinct values in the list, or we may want to count occurrence of each value in the ArrayList. We can remove the duplicates in a few ways. Here we propose 3 methods :    public static void main(String[] args){        //SuperClass sub=new SubClass();                String[] ar = { "dd", "c", "dd", "ff", "b", "e", "e" };        ArrayList list ...