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Java program to check whether an item exists in the LinkedList collection or not

Java example to check whether an item exists in the LinkedList collection or not.
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 items using add() method. After that, we will check whether an item exists or not in created collection using contains() method and print the appropriate message.

Program/Source Code:

The source code to check whether an item exists in the LinkedList collection or not is given below. The given program is compiled and executed successfully.

// Java program to check whether an item exists in 
// LinkedList collection or not

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);

    if (countries.contains("UK") == true)
      System.out.println("Item exists.");
    else
      System.out.println("Item does not exists.");
  }
}

Output:

Country names: [India, USA, UK, CANADA]
Item exists.

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 country names using add() method. Then we checked an item is exist or not, in created collection using contains() method and printed the appropriate message.

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