LinkedBlockingQueue iterator() method in Java

The iterator() method of LinkedBlockingQueue returns an iterator of the same elements, as this LinkedBlockingQueue, in a proper sequence. The elements returned from this method contains all the elements in order from first(head) to last(tail) of LinkedBlockingQueue. The returned iterator is weakly consistent.

Syntax:

public Iterator<E> iterator()

Return Value: The method returns the iterator having same elements as present in LinkedBlockingQueue in order from first(head) to last(tail).

Below programs illustrates iterator() method of LinkedBlockingQueue class:

Program 1: Creating an Iteretor from LinkedBlockingQueue which contains names of different student of a class.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate iterator()
// method of LinkedBlockingQueue
  
import java.util.concurrent.LinkedBlockingQueue;
import java.util.Iterator;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // define capacity of LinkedBlockingQueue
        int capacityOfQueue = 7;
  
        // create object of LinkedBlockingQueue
        LinkedBlockingQueue<String> linkedQueue
            = new LinkedBlockingQueue<String>(capacityOfQueue);
  
        // Add element to LinkedBlockingQueue
        linkedQueue.add("John");
        linkedQueue.add("Tom");
        linkedQueue.add("Clark");
        linkedQueue.add("Kat");
  
        // create Iterator of linkedQueue using iterator() method
        Iterator<String> listOfNames = linkedQueue.iterator();
  
        // print result
        System.out.println("list of names:");
        while (listOfNames.hasNext())
            System.out.println(listOfNames.next());
    }
}

chevron_right






                        filter_none









Output:


list of names:
John
Tom
Clark
Kat





Program 2: Creating an Iteretor from LinkedBlockingQueue which contains list of Employees.











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Java Program Demonstrate iterator() 


// method of LinkedBlockingQueue 


  


import java.util.concurrent.LinkedBlockingQueue; 


import java.util.Iterator; 


  


public class GFG { 


  


    public void collectIterator() 


    { 


        // define capacity of LinkedBlockingQueue 


        int capacityOfQueue = 7; 


  


        // create object of LinkedBlockingQueue 


        LinkedBlockingQueue<Employee> linkedQueue 


            = new LinkedBlockingQueue<Employee>(capacityOfQueue); 


  


        // Add element to LinkedBlockingQueue 


        Employee emp1 = new Employee("Sachin", "Developer", "39000"); 


        Employee emp2 = new Employee("Sanjeev", "Tester", "26000"); 


  


        // Add Employee Objects to linkedQueue 


        linkedQueue.add(emp1); 


        linkedQueue.add(emp2); 


  


        // create Iterator of linkedQueue using iterator() method 


        Iterator<Employee> listOfEmployee = linkedQueue.iterator(); 


  


        // print result from iterator 


        System.out.println("list of Employees:"); 


        while (listOfEmployee.hasNext()) { 


            System.out.println("*************************"); 


            Employee emp = listOfEmployee.next(); 


            System.out.println("Employee Name : " + emp.name); 


            System.out.println("Employee Position : " + emp.position); 


            System.out.println("Employee Salary : " + emp.salary); 


        } 


    } 


  


    // create an Employee Object with name, 


    // position and salary as an attribute 


    public class Employee { 


  


        public String name; 


        public String position; 


        public String salary; 


  


        Employee(String name, String position, String salary) 


        { 


            this.name = name; 


            this.position = position; 


            this.salary = salary; 


        } 


  


        @Override


        public String toString() 


        { 


            return "Employee [name=" + name + ", position="


                + position + ", salary=" + salary + "]"; 


        } 


    } 


  


    // Main Method 


    public static void main(String[] args) 


    { 


        GFG gfg = new GFG(); 


        gfg.collectIterator(); 


    } 


} 



















                        chevron_right







                        filter_none









Output:


list of Employees:
*************************
Employee Name : Sachin
Employee Position : Developer
Employee Salary : 39000
*************************
Employee Name : Sanjeev
Employee Position : Tester
Employee Salary : 26000





Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingQueue.html#iterator–



          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Image
AmanSingh2210
I am a Developer I love to code and bring my ideas alive
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.