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:
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:
Queue is [423, 422, 421, 420, 424] The iterator values: 423 422 421 420 424
Program 2:
// 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:
Queue is [User, Employee, Manager, Analyst, HR] The iterator values: User Employee Manager Analyst HR
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ArrayBlockingQueue.html#iterator
