Java Program to Add the Data from the Specified Collection in the Current Collection

// Java Program to Add the Data from the Specified
// Collection in the Current Collection

import java.util.*;
public class AddCollections {
    public static void main(String[] args)
    {
        // Creating object of a list which is our current
        // collection
        ArrayList<Integer> list = new ArrayList<Integer>();

        // Adding values to the initial list
        list.add(1);
        list.add(2);
        list.add(3);

        // Printing the initial list
        System.out.println(
            "Initial collection value of list: " + list);

        // creating object of the specified list.
        ArrayList<Integer> list2 = new ArrayList<Integer>();

        list2.add(4);
        list2.add(5);
        list2.add(6);

        // Printing the initial list
        System.out.println(
            "Initial collection value of list2: " + list2);

        // returns true if addition is successful else
        // false
        // adding data from the specified collection in
        // the  current collection at a specified position
        boolean b = list.addAll(2, list2);

        // printing the boolean result
        System.out.println("Boolean Result: " + b);

        // printing the final list with the new values added
        System.out.println(
            "Final collection value of list: " + list);

        // creating an object for a different collection

        Integer[] arr = new Integer[4];

        // Initializing the array
        arr[0] = 9;
        arr[1] = 8;
        arr[2] = 7;
        arr[3] = 6;

        // Adding array elements to list2
        Collections.addAll(list2, arr);

        // Printing the new List2
        System.out.println(
            "Final collection value of list2: " + list2);
    }
}