extends Collection interface,stores sequence of elements,elements can be inserted/accessed by their position in the list using zero based index.
may contain duplicate elements,throws UnsupportedOperationException,ClassCastException
Methods--void add(int index,Object obj),boolean addAll(int index,Collection c),Object get(int index),int indexOf(Object obj),int lastIndexOf(Object obj),
Object remove(int index),Object set(int index,Object obj),List subList(int start,int end).
