The list interface is nothing but a subtype of tha java ordered collection Interface. So the java.util.List interface extends Collection & declares the behaviour of a collection that stores a sequence of elements. So the order list of objects, can be access the elements of a list in a specific sequence and by an index too. So that the use can easily access these elements by their integer indes and sear for elements in the list.

For details visit What is list Interface in Java Program...