ConcurrentLinkedDeque descendingIterator() method in Java with Example
The Java.util.concurrent.ConcurrentLinkedDeque.descendingIterator() method is used to return an iterator of the same elements as the ConcurrentLinkedDeque but in the reverse order.
Syntax:
Iterator iterate_value = Array_Deque.descendingIterator();
Parameters: The method does not take any parameter.
Return Value: The method iterates over the elements of the deque and returns the values(iterators) in reverse order.
Below programs illustrate the Java.util.concurrent.ConcurrentLinkedDeque.descendingIterator() method:
Program 1:
// Java code to illustrate descendingIterator() import java.util.concurrent.*;import java.util.*; public class ConcurrentLinkedDequeDemo { public static void main(String args[]) { // Creating an empty ConcurrentLinkedDeque ConcurrentLinkedDeque<String> de_que = new ConcurrentLinkedDeque<String>(); // Use add() method to add elements into the Queue de_que.add("Welcome"); de_que.add("To"); de_que.add("Geeks"); de_que.add("4"); de_que.add("Geeks"); // Displaying the ConcurrentLinkedDeque System.out.println("ConcurrentLinkedDeque: " + de_que); // Creating a desc_iterator Iterator value = de_que.descendingIterator(); // Displaying the values after iterating // through the ConcurrentLinkedDeque // in reverse order System.out.println("The iterator values are: "); while (value.hasNext()) { System.out.println(value.next()); } }} |
Output:
ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks] The iterator values are: Geeks 4 Geeks To Welcome
Program 2:
// Java code to illustrate descendingIterator() import java.util.*;import java.util.concurrent.*; public class ConcurrentLinkedDequeDemo { public static void main(String args[]) { // Creating an empty ConcurrentLinkedDeque ConcurrentLinkedDeque<Integer> de_que = new ConcurrentLinkedDeque<Integer>(); // Use add() method to add elements into the Queue de_que.add(10); de_que.add(15); de_que.add(30); de_que.add(20); de_que.add(5); // Displaying the ConcurrentLinkedDeque System.out.println("ConcurrentLinkedDeque: " + de_que); // Creating a desc_iterator Iterator value = de_que.descendingIterator(); // Displaying the values after iterating // through the ConcurrentLinkedDeque // in reverse order System.out.println("The iterator values are: "); while (value.hasNext()) { System.out.println(value.next()); } }} |
Output:
ConcurrentLinkedDeque: [10, 15, 30, 20, 5] The iterator values are: 5 20 30 15 10
