ArrayList.add() method is employed to feature a component at particular index in Java ArrayList.

Syntax:

public void add(int index, Object element) ;

Parameters: 

• index  -position at which the element has to be inserted. The index is zero-based.
• element – the element to be inserted at the specified position.

Exception: 

For a list of string

list=[A,B,C]

list.add(1,”D”);

list.add(2,”E”);

list=[A,D,E,B,C]

For a list of integers

LIST=[1,2,3]

list.add(2,4);

list=[1,2,4,3]

Implementation:

// Adding an Element at Particular
// Index in Java ArrayList
import java.io.*;
import java.util.ArrayList;

class GFG {

	// Main driver method
	public static void main(String[] args)
	{
		// Creating an ArrayList
		ArrayList list = new ArrayList<>();

		// Adding elements to ArrayList
		// using add method for String ArrayList
		list.add("A");
		list.add("B");
		list.add("C");

		/* Index is zero based */

		// 3 gets added to the 1st position
		list.add(1, "D");

		// 4 gets added to the 2nd(position)
		list.add(2, "E");

		// Displaying elements in ArrayList
		System.out.println(list);
	}
}

Output

[A, D, E, B, C]