Arraylist.add(index, element) code example
Example 1: java insert into arraylist
ArrayList<Integer> str=new ArrayList<Integer>();
str.add(0);
str.add(1);
// Result = [0, 1]
str.add(1, 11);
// Result = [0, 11, 1]
Example 2: append to arraylist by index java
arrlist.add(2,25);
// .add(index, content)