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

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mahmoud2506

2022-05-07

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

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

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