Java LinkedTransferQueue poll() Method

The poll() method of LinkedTransferQueue class retrieves and removes the head of the LinkedTransferQueue. The method returns null if this queue is empty.

Syntax:

Parameters:

Specified By:

The poll() method of LinkedTransferQueue class is specified by poll() method in interface Queue<E>.

Return Value:

The poll() method returns this queue's head, or null if this queue is empty.

Example 1

import java.util.Queue;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueuePollExample1 {  
    public static void main(String[] args) {  
        int capacity=100;  
        Queue<String> queue = new LinkedTransferQueue<String>();  
        queue.add("Jack");  
        queue.add("Marry");  
        queue.add("Hack");  
        //retrieves and removes head of the queue  
        String val = queue.poll();  
        System.out.println("Head of queue is : "+val);  
        System.out.println("Elements left in queue : "+queue);  
    }  
}  

Test it Now

Output:

Head of queue is : Jack
Elements left in queue : [Marry, Hack]

Example 2

import java.util.Queue;  
import java.util.concurrent.LinkedTransferQueue;  
public class LinkedTransferQueuePollExample2 {  
    public static void main(String[] args) {  
        int capacity=100;  
        Queue<String> queue = new LinkedTransferQueue<String>();  
        queue.add("John");  
        queue.add("Harry");  
        queue.add("Peter");  
        queue.add("Kristen");  
        //retrieves and removes head of the queue  
        String val = queue.poll();  
        System.out.println("Head of queue is : "+val);  
        System.out.println("Elements left in queue : "+queue);  
    }  
}

Test it Now

Output:

Output 
Head of queue is : John
Elements left in queue : [Harry, Peter, Kristen]

Java LinkedTransferQueue poll(long timeout, TimeUnit unit) Method

The poll(long timeout, TimeUnit unit) method of LinkedTransferQueue class retrieves the head of this queue. It waits till the specified time is essential for an element to be available, and also removes it. The method returns null if this queue is empty.

Syntax:

Parameters:

timeout - this is the time to wait before giving up(in units of the unit)

unit - this is the TimeUnit deciding how to represent the timeout parameter

Specified By:

The poll() method of LinkedTransferQueue class is specified by poll() method in interface Queue<E>.

Return Value:

The poll() method returns this queue's head, or null if this queue is empty or if the assigned waiting time passes before the element is available.

Throws:

InterruptedException ?This exception will throw if interrupted while waiting

Example 3

import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.TimeUnit;  
public class LinkedTransferQueuePollExample3 {  
    public static void main(String[] args) throws InterruptedException {  
        int capacity = 5;  
        LinkedTransferQueue<Integer> queue = new LinkedTransferQueue<Integer>();  
        queue.add(67);  
        queue.add(109);  
        queue.add(76);  
        queue.add(876);  
        //retrieves and removes the head of the queue waiting upto the specified wait time  
        int val=queue.poll(678, TimeUnit.MILLISECONDS);  
        System.out.println("Head of queue : "+val);  
        System.out.println("Elements in queue : "+queue);  
    }  
}

Test it Now

Output:

Head of queue : 67
Elements in queue : [109, 76, 876]

Example 4

import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.TransferQueue;  
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 LinkedTransferQueuePollExample4 {  
    public static void main(String[] args) {  
        Employee employee1 = new Employee(12000,"Peter");  
        Employee employee2 = new Employee(4500,"Marry");  
        Employee employee3 = new Employee(1500,"Kristen");  
        Employee employee4 = new Employee(1000,"Jeet");  
        int capacity = 100;  
        TransferQueue<Employee> queue = new LinkedTransferQueue<Employee>();  
        queue.add(employee1);  
        queue.add(employee2);  
        queue.add(employee3);  
        queue.offer(employee4);  
       // int val1 =queue.poll().wages;  
        System.out.println(queue.peek().name+" gets the highest wages of "+queue.poll().wages);  
        System.out.println(queue.peek().name+" gets the second highest wages of "+queue.poll().wages);  
    }  
}  

Test it Now

Output:

Peter gets the highest wages of 12000
Marry gets the second highest wages of 4500

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