"Integer" in array list?

#1

Why are we using Integer here instead of int??

#2

@bhavik911,
ArrayList can only reference types, not primitives. Integer is a class, not a primitive.

When you declare ArrayList<Integer> list1 = new ArrayList<Integer>() , you’re creating an ArrayList which will store the Integer type, not the int primitive.

#3

but finally when I am adding elements to list by , list.add(2) , am i not adding int elements only here??

#4

@bhavik911,

A Java both int and Integer are used to store integer type data the major difference between both is type of int is primitive while Integer is of class type.

Hence you are declaring the arraylist of the class type Integer