The Java.util.ArrayDeque.descendingIterator() method is used to return an iterator of the same elements as the ArrayDeque 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.ArrayDeque.descendingIterator() method:
Program 1:
// Java code to illustrate descendingIterator() import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<String> de_que = new ArrayDeque<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 ArrayDeque
System.out.println( "ArrayDeque: " + de_que);
// Creating a desc_iterator
Iterator value = de_que.descendingIterator();
// Displaying the values after iterating through the Deque
// in reverse order
System.out.println( "The iterator values are: " );
while (value.hasNext()) {
System.out.println(value.next());
}
}
} |
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks] The iterator values are: Geeks 4 Geeks To Welcome
Program 2:
// Java code to illustrate descendingIterator() import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<Integer> de_que = new ArrayDeque<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 ArrayDeque
System.out.println( "ArrayDeque: " + de_que);
// Creating a desc_iterator
Iterator value = de_que.descendingIterator();
// Displaying the values after iterating through the Deque
// in reverse order
System.out.println( "The iterator values are: " );
while (value.hasNext()) {
System.out.println(value.next());
}
}
} |
Output:
ArrayDeque: [10, 15, 30, 20, 5] The iterator values are: 5 20 30 15 10