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Java program to add LinkedList collection into another LinkedList collection on the specified index

Java example to add LinkedList collection into another LinkedList collection on the specified index.
Submitted by Nidhi, on April 12, 2022

Problem Solution:

In this program, we will create two Linked Lists for country names using a Linked List collection. Then we will add a LinkedList collection to another LinkedList collection on a specified index using the addAll() method.

Program/Source Code:

The source code to add LinkedList collection to another LinkedList collection on the specified index is given below. The given program is compiled and executed successfully.

// Java program to add LinkedList collection into another LinkedList 
// collection on the specified index

import java.util.LinkedList;

public class Main {
  public static void main(String[] args) {
    LinkedList < String > countries = new LinkedList < String > ();
    LinkedList < String > country = new LinkedList < String > ();

    countries.add("India");
    countries.add("USA");
    countries.add("UK");
    countries.add("CANADA");

    country.add("PAKISTAN");
    country.add("SRI-LANKA");
    country.add("JAPAN");

    System.out.println("Country names: " + countries);

    countries.addAll(2, country);

    System.out.println("Country names: " + countries);
  }
}

Output:

Country names: [India, USA, UK, CANADA]
Country names: [India, USA, PAKISTAN, SRI-LANKA, JAPAN, UK, CANADA]

Explanation:

In the above program, we imported the "java.util.LinkedList" package to use the LinkedList collection class. Here, we created a class Main. The Main class contains a main() method. The main() method is the entry point for the program.

In the main() method, we created two objects of the LinkedList collection class to store country names. Here, we added country collection into countries collection at index two using the addAll() method and printed the updated collection.

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