The descendingIterator() method of LinkedBlockingDeque returns an iterator over the elements in this deque in a reverse sequential order. The elements will be returned in order from last(tail) to first(head). The returned iterator is a “weakly consistent” iterator.
Syntax:
public Iterator descendingIterator()
Parameters: This method does not accept any parameter.
Returns: This method returns an iterator over the elements in this deque in a reverse sequential order.
Below programs illustrate descendingIterator() method of LinkedBlockingDeque:
Program 1:
// Java Program Demonstrate descendingIterator()// method of LinkedBlockingDeque import java.util.concurrent.LinkedBlockingDeque;import java.util.*; public class GFG { public static void main(String[] args) { // create object of LinkedBlockingDeque LinkedBlockingDeque<Integer> LBD = new LinkedBlockingDeque<Integer>(); // Add numbers to front of LinkedBlockingDeque LBD.addFirst(7855642); LBD.addFirst(35658786); LBD.addFirst(5278367); LBD.addFirst(74381793); // Call descendingIterator() method of LinkedBlockingDeque Iterator iteratorVals = LBD.descendingIterator(); // Print elements of iterator // created from PriorityBlockingQueue System.out.println("The iterator values" + " of LinkedBlockingDeque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of LinkedBlockingDeque are: 7855642 35658786 5278367 74381793
Program 2:
// Java Program Demonstrate descendingIterator()// method of LinkedBlockingDeque// when list is of strings import java.util.concurrent.LinkedBlockingDeque;import java.util.*; public class GFG { public static void main(String[] args) { // create object of LinkedBlockingDeque LinkedBlockingDeque<String> LBD = new LinkedBlockingDeque<String>(); // Add numbers to front of LinkedBlockingDeque LBD.add("Geeks"); LBD.add("forGeeks"); LBD.add("A"); LBD.add("Computer"); LBD.add("Portal"); // Call iterator() method of LinkedBlockingDeque Iterator iteratorVals = LBD.descendingIterator(); // Print elements of iterator // created from PriorityBlockingQueue System.out.println("The iterator values" + " of LinkedBlockingDeque are:"); // prints the elements using an iterator while (iteratorVals.hasNext()) { System.out.println(iteratorVals.next()); } }} |
Output:
The iterator values of LinkedBlockingDeque are: Portal Computer A forGeeks Geeks
