ArrayBlockingQueue iterator() Method in Java
Last Updated :
26 Nov, 2018
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The iterator() method of ArrayBlockingQueue class is used to returns an iterator of the same elements as this queue in a proper sequence. The elements returned from this method contains elements in order from first(head) to last(tail). The returned iterator is weakly consistent.
Syntax:
Java
Java
public Iterator iterator()Return Value: The method returns the iterator having same elements as present in ArrayBlockingQueue in proper sequence. Below programs illustrates iterator() method of ArrayBlockingQueue class: Program 1:
// Program Demonstrate how to apply iterator() method
// of ArrayBlockingQueue Class.
import java.util.concurrent.ArrayBlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Define capacity of ArrayBlockingQueue
int capacity = 5;
// Create object of ArrayBlockingQueue
ArrayBlockingQueue<Integer> queue = new
ArrayBlockingQueue<Integer>(capacity);
// Add 5 elements to ArrayBlockingQueue
queue.offer(423);
queue.offer(422);
queue.offer(421);
queue.offer(420);
queue.offer(424);
// Print queue
System.out.println("Queue is " + queue);
// Call iterator() method and Create an iterator
Iterator iteratorValues = queue.iterator();
// Print elements of iterator
System.out.println("\nThe iterator values:");
while (iteratorValues.hasNext()) {
System.out.println(iteratorValues.next());
}
}
}
Output:
Program 2:
Queue is [423, 422, 421, 420, 424] The iterator values: 423 422 421 420 424
// Program Demonstrate how to apply iterator() method
// of ArrayBlockingQueue Class.
import java.util.concurrent.ArrayBlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Define capacity of ArrayBlockingQueue
int capacity = 5;
// Create object of ArrayBlockingQueue
ArrayBlockingQueue<String> queue = new
ArrayBlockingQueue<String>(capacity);
// Add 5 elements to ArrayBlockingQueue
queue.offer("User");
queue.offer("Employee");
queue.offer("Manager");
queue.offer("Analyst");
queue.offer("HR");
// Print queue
System.out.println("Queue is " + queue);
// Call iterator() method and Create an iterator
Iterator iteratorValues = queue.iterator();
// Print elements of iterator
System.out.println("\nThe iterator values:");
while (iteratorValues.hasNext()) {
System.out.println(iteratorValues.next());
}
}
}
Output:
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html#iterator
Queue is [User, Employee, Manager, Analyst, HR] The iterator values: User Employee Manager Analyst HR
