How to join or combine two ArrayList at specified index

Eg:

public static void main(String[]args){

//creation of Arraylist  with string arguments

//adding elements to Arraylist 

ArrayList<String> al=new ArrayList<String>();

al.add("India");

al.add("US");

//Displaying elements of Arraylist

System.out.println(al);

//creation of Arraylist 2 with string arguments

ArrayList<String> al2=new ArrayList<String>();

//adding elements to Arraylist 2

al2.add("Australia");

al2.add("Germany");

al2.add("Europe");

al.addAll(2,al2);

}

Output:[India,US,Australia,Germany,Europe]