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Java program to insert an element at the beginning of the LinkedList collection

Java example to insert an element at the beginning of the LinkedList collection.
Submitted by Nidhi, on April 13, 2022

Problem Solution:

In this program, we will create a Linked List for country names using a Linked List collection. Then we will add an item at the beginning using the addFirst() method.

Program/Source Code:

The source code to insert an element at the beginning of the LinkedList collection is given below. The given program is compiled and executed successfully.

// Java program to insert an element at the beginning 
// of the LinkedList collection

import java.util.LinkedList;

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

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

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

    countries.addFirst("JAPAN");

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

Output:

Country names: [India, USA, UK, CANADA]
Country names: [JAPAN, India, USA, 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 an object of the LinkedList collection class to store country names. Here, we added county names using add() method. Then we added "JAPAN" at the beginning of LinkedList using the addFirst() method. After that, we printed the updated LinkedList.

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