Java LinkedBlockingDeque pollLast() Method

The pollLast() method of LinkedBlockingDeque class retrieves the last element of this deque, and also removes it. This method returns null if this deque is empty.

The pollLast(long timeout, TimeUnit unit) method of LinkedBlockingDeque class retrieves the last element of this deque, awaiting till the specified time is essential for an element to be available.

Syntax:

public E pollLast()
public E pollLast(long timeout, TimeUnit unit)throws InterruptedException

Parameters:

NA
timeout - It is the time to wait before giving up(in units of the unit)
unit - It is the TimeUnit deciding how to represent the timeout parameter

Specified By:

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

pollLast() method in interface Deque<E>.
pollLast() method in interface BlockingDeque<E>.

Return Value:

The pollLast() method returns this deque'stail, and if this deque is empty returns null.

The pollLast(long timeout, TimeUnit unit) method returns this deque's tail, or null if the assigned waiting time passes before the element is available.

Throws:

The pollLast() method throws InterruptedException if the method is disrupted while waiting.

Example 1

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequePollLastExample1 {
public static void main(String[] args) {
int capacity=100;
LinkedBlockingDeque<String>deque = new LinkedBlockingDeque<String>(capacity);
deque.add("Himanshu");
deque.add("Rahul");
deque.add("Rita");
deque.add("Ramesh");
//retrieves and removes last element of the queue
String val = deque.pollLast();
System.out.println("Last element of the deque is : "+val);
System.out.println("Elements left in deque: "+deque);
    }
}

Test it Now

Output:

Last element of the dequeis : Ramesh
Elements left in deque : [Himanshu, Rahul, Rita]

Example 2

import java.util.concurrent.LinkedBlockingDeque;
class Employee {
int wages;
    String name;
public Employee(int wages, String name) {
this.wages= wages;
this.name = name;
    }
public String toString(){
return this.name+" got "+ this.wages+" marks.";
    }
}
public class LinkedBlockingDequePollLastExample2 {
public static void main(String[] args) {
        Employee employee1 = new Employee(12000,"Himanshu");
        Employee employee2 = new Employee(4500,"Geetanjali");
        Employee employee3 = new Employee(1500,"Vineet");
        Employee employee4 = new Employee(1000,"Jyoti");
int capacity = 100;
LinkedBlockingDeque<Employee>deque = new LinkedBlockingDeque<Employee>(capacity);
deque.add(employee1);
deque.add(employee2);
deque.add(employee3);
deque.offer(employee4);
System.out.println(deque.peekLast().name+" gets the lowest wages of "+deque.pollLast().wages);
System.out.println(deque.peekLast().name+" gets the second  lowest wages of "+deque.pollLast().wages);
    }
}

Test it Now

Output:

Jyoti gets the lowest wages of 1000
Vineet gets the second  lowest wages of 1500

Example 3

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;
public class LinkedBlockingDequePollLastExample3 {
public static void main(String[] args) throws InterruptedException {
int capacity = 5;
LinkedBlockingDeque<Integer>deque = new LinkedBlockingDeque<Integer>(capacity);
deque.add(67);
deque.add(109);
deque.add(76);
deque.add(876);
//retrieves and removes the last element of the deque waiting upto the specified wait time
int val=deque.pollLast(678, TimeUnit.MILLISECONDS);
System.out.println("Last element of the deque : "+val);
System.out.println("Elements in deque : "+deque);
    }
}

Test it Now

Output:

Last element of the deque : 876
Elements in deque : [67, 109, 76]

Next TopicJava LinkedBlockingDeque

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Java LinkedBlockingDeque pollLast() Method

Syntax:

Parameters:

Specified By:

Return Value:

Throws:

Example 1

Example 2

Example 3