The iterator() method of Deque Interface returns an iterator over the elements in this deque in a proper sequence. The elements will be returned in order from first (head) to last (tail). The returned iterator is a “weakly consistent” iterator.
Syntax:
Iterator iterator()
Parameters: This method does not accepts any parameter.
Returns: This method returns an iterator over the elements in this deque in a proper sequence.
Below programs illustrate iterator() method of Deque:
Program 1: With the help of ArrayDeque.
// Java Program Demonstrate iterator()// method of Dequeimport java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Deque Deque<Integer> DQ = new ArrayDeque<Integer>(); // Add numbers to end of Deque DQ.add(7855642); DQ.add(35658786); DQ.add(5278367); DQ.add(74381793); // Call iterator() method of Deque Iterator iteratorVals = DQ.iterator(); // Print elements of iterator // created from Deque System.out.println("The iterator values" + " of Deque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of Deque are: 7855642 35658786 5278367 74381793
Program 2: With the help of LinkedList.
// Java Program Demonstrate iterator()// method of Dequeimport java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Deque Deque<Integer> DQ = new LinkedList<Integer>(); // Add numbers to end of Deque DQ.add(7855642); DQ.add(35658786); DQ.add(5278367); DQ.add(74381793); // Call iterator() method of Deque Iterator iteratorVals = DQ.iterator(); // Print elements of iterator // created from Deque System.out.println("The iterator values" + " of Deque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of Deque are: 7855642 35658786 5278367 74381793
Program 3: With the help of LinkedBlockingDeque.
// Java Program Demonstrate iterator()// method of Dequeimport java.util.*;import java.util.concurrent.LinkedBlockingDeque; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Deque Deque<Integer> DQ = new LinkedBlockingDeque<Integer>(); // Add numbers to end of Deque DQ.add(7855642); DQ.add(35658786); DQ.add(5278367); DQ.add(74381793); // Call iterator() method of Deque Iterator iteratorVals = DQ.iterator(); // Print elements of iterator // created from Deque System.out.println("The iterator values" + " of Deque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of Deque are: 7855642 35658786 5278367 74381793
Program 4: With the help of ConcurrentLinkedDeque.
// Java Program Demonstrate iterator()// method of Dequeimport java.util.*;import java.util.concurrent.ConcurrentLinkedDeque; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of Deque Deque<Integer> DQ = new ConcurrentLinkedDeque<Integer>(); // Add numbers to end of Deque DQ.add(7855642); DQ.add(35658786); DQ.add(5278367); DQ.add(74381793); // Call iterator() method of Deque Iterator iteratorVals = DQ.iterator(); // Print elements of iterator // created from Deque System.out.println("The iterator values" + " of Deque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of Deque are: 7855642 35658786 5278367 74381793
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html#iterator–
