Java ConcurrentLinkedQueue offer() Method

The offer() method of ConcurrentLinkedQueue class is used to add the specified element at the tail of this queue.

Syntax:

Parameters:

The parameter 'e' is the element that is to be added in the queue.

Specified By:

The offer() method of ConcurrentLinkedQueue class is specified by:

offer in the interface Queue<E>.

Throws:

The offer() method throws NullPointerException - if the defined element(e) holds null value.

Return Value:

The offer() method returns true on the successful insertion, otherwise returns false.

Example 1

import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueOfferExample1 {
    public static void main(String[] args) throws InterruptedException {
        ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();
        //offer() method insert the element at the tail of queue
        queue.offer(12);
        queue.offer(67);
        queue.offer(45);
        queue.offer(123);
        System.out.println("Queue : "+queue);
    }
}

Test it Now

Output:

Queue : [12, 67, 45, 123]

Example 2

import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueOfferExample2 {
    public static void main(String[] args) throws InterruptedException {
        ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();
        queue.add("Reema");
        queue.add("Rahul");
        queue.add("Rita");
        queue.add("Ramesh");
        //offer() method insert the element at the tail of queue
        queue.offer("Gita");
        for(String xyz:queue){
            System.out.println(xyz);
        }
    }
}

Test it Now

Output:

Reema
Rahul
Rita
Ramesh
Gita

Example 3

import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueOfferExample3 {
    public static void main(String[] args) {
        Employee1 employee1 = new Employee1("Reema     ", "Panda   ", "reemapanda18@gamil.com");
        Employee1 employee2 = new Employee1("Geetanjali", "Sharma  ", "geetanjaliSharma28@gamil.com");
        Employee1 employee3 = new Employee1("Vineet    ", "Tanjea  ", "VineetTanjea56@gamil.com");
        ConcurrentLinkedQueue<Employee1> queue = new ConcurrentLinkedQueue<Employee1>();
        queue.add(employee1);
        queue.add(employee2);
        queue.add(employee3);
        Employee1 employee4 = new Employee1("Himanshu  ", "Bhardwaj", "himanshubhardwaj0604@gamil.com");
        queue.offer(employee4);
        for (Employee1 xyz : queue) {
            System.out.println(xyz);
        }
    }
}
class Employee1{
    private String f_name;
    private String l_name;
    private String email;
    public Employee1(String f_name, String l_name, String email) {
        this.f_name = f_name;
        this.l_name = l_name;
        this.email = email;
    }
    public String toString(){
        return f_name+"  " +l_name+"  "+email;
    }
}

Test it Now

Output:

Reema       Panda     [email protected]
Geetanjali  Sharma    [email protected]
Vineet      Tanjea    [email protected]
Himanshu    Bhardwaj  [email protected]

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