Java LinkedBlockingDeque offer() Method

The offer() method of LinkedBlockingDeque class adds the defined element at the tail of this deque.

Syntax:

public boolean offer(E e)
public boolean offer(E e, long timeout, TimeUnit unit) throws InterruptedException

Parameters:

e - It is the element to be added.

timeout - It is the time till the method has to wait before giving up, in units of unit.

unit - It is the TimeUnit that decides how to interpret the timeout parameter.

Specified By:

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

offer() method in interface Queue<E>.
offer() method in interface Deque<E>.
offer() method in interface BlockingQueue<E>.
offer() method in interface BlockingDeque<E>.

Return Value:

The offer() method returns true if the defined element is added to this queue, else returns false.

Throws:

The offer() method throws:

NullPointerException - If the element defined holds null value.
InterruptedException - If method call is interrupted during wait.

Example 1

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeOfferExample1 {
	public static void main(String[] args) {
        int capacity =100;
        LinkedBlockingDeque<Integer> queue = new LinkedBlockingDeque<Integer>(capacity);
            queue.add(567);
            queue.add(56);
            queue.add(5671);
            queue.add(5167);
            System.out.println("Queue before using offer() : \n"  +queue);
            
            queue.offer(5670);
            System.out.println("Queue after using offer() : \n"  +queue);
    }
}

Test it Now

Output:

Queue before using offer() : 
[567, 56, 5671, 5167]
Queue after using offer() : 
[567, 56, 5671, 5167, 5670]

Example 2

import java.util.concurrent.TimeUnit;
import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeOfferExample2 {
	
	    public static void main(String[] args) throws InterruptedException {

	        int capacity =5;
	        LinkedBlockingDeque<String> queue = new LinkedBlockingDeque<String>(capacity);

	            queue.add("Albert");
	            queue.add("Christeena");
	            queue.add("Aviral");
	            queue.add("Pratik");
	           //Inserts the element at the tail of queue,waiting up to the specified waiting time.
	            queue.offer("Janak",1000, TimeUnit.MILLISECONDS);
	            for(String xyz:queue){
	               System.out.println(xyz);
	           }
       }  }

Test it Now

Output:

Albert
Christeena
Aviral
Pratik
Janak

Example 3

import java.util.concurrent.LinkedBlockingDeque;
class Student{

    private String f_name;
    private String l_name;
    private int roll_no;

    public Student(String f_name, String l_name, int roll_no) {

        this.f_name = f_name;
        this.l_name = l_name;
        this.roll_no = roll_no;
    }
    public String toString(){

        return f_name+"  " +l_name+"  "+roll_no;
    }
}
public class LinkedBlockingDequeOfferExample3 {

    public static void main(String[] args) {

    	Student student1 = new Student("Harshit", "Bhardwaj   ", 15023022);
    	Student student2 = new Student("Rahul","Verma        ",15023045);
    	Student student3 = new Student("Deepanjali","Thakur  ", 15023015);

        int capacity = 100;
        LinkedBlockingDeque<Student> deque = new LinkedBlockingDeque<Student>(capacity);
        deque.add(student1);
        deque.add(student2);
        deque.add(student3);

        Student student4 = new Student("Raman", "Mehta        ", 14022056);
        deque.offer(student4);
        for (Student xyz : deque) {
            System.out.println(xyz);
        }
    }
}

Test it Now

Output:

Harshit  Bhardwaj     15023022
Rahul  Verma          15023045
Deepanjali  Thakur    15023015
Raman  Mehta          14022056

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Java LinkedBlockingDeque offer() Method

Syntax:

Parameters:

Specified By:

Return Value:

Throws:

Example 1

Example 2

Example 3