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Java program to add elements to Queue using add() and offer() methods

Java example to add elements to Queue using add() and offer() methods.
Submitted by Nidhi, on April 28, 2022

Problem statement

In this program, we will create a queue using the Queue interface with the help of Linked List collection and store elements in a FIFO (First In First Out) manner. Here, we will use add() and offer() methods to insert elements into the queue.

Java program to add elements to Queue using add() and offer() methods

The source code to add elements to Queue using add() and offer() methods is given below. The given program is compiled and executed successfully.

// Java program to add elements to Queue using 
// add() and offer() methods

import java.util.LinkedList;
import java.util.Queue;

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

    queue.add(10);
    queue.add(20);

    System.out.println("Queue elements: ");
    for (int item: queue) {
      System.out.print(item + " ");
    }

    queue.offer(30);
    queue.offer(40);
    queue.offer(50);

    System.out.println("\nUpdated Queue: ");
    for (int item: queue) {
      System.out.print(item + " ");
    }
  }
}

Output

Queue elements: 
10 20 
Updated Queue: 
10 20 30 40 50 

Explanation

In the above program, we imported the "java.util.LinkedList" and "java.util.Queue" packages to use the Queue Interface and LinkedList collection respectively. 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 a queue using the LinkedList collection. Then we used to add(), offer() methods to insert items into the queue and printed the queue.

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