How to insert an object in an ArrayList at a specific position

Question

Suppose I have an ArrayList of objects of size n. Now I want to insert an another object at specific position, let\'s say at index position k (is greater than 0 and less tha

Answer 1

Here is the simple arraylist example for insertion at specific index

ArrayList str=new ArrayList();
    str.add(0);
    str.add(1);
    str.add(2);
    str.add(3); 
    //Result = [0, 1, 2, 3]
    str.add(1, 11);
    str.add(2, 12);
    //Result = [0, 11, 12, 1, 2, 3]