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The descendingIterator() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which is used to return an iterator over the elements in this set in descending order. Syntax:

ConcurrentSkipListSet.descendingIterator()

Return Value: The function returns an iterator over the elements in this set in descending order. Below programs illustrate the ConcurrentSkipListSet.descendingIterator() method: Program 1:

Java

// Java Program Demonstrate descendingIterator()
// method of ConcurrentSkipListSet 

import java.util.Iterator;
import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetIteratorExample1 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<String>
            set = new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        set.add("Gfg");
        set.add("is");
        set.add("fun!!");

        // Returns an iterator over the elements
        Iterator<String> iterator = set.descendingIterator();

        // Printing the elements of the set
        while (iterator.hasNext())
            System.out.print(iterator.next() + " ");
    }
}

Output:

is fun!! Gfg

Program 2:

Java

// Java Program Demonstrate descendingIterator()
// method of ConcurrentSkipListSet 

import java.util.Iterator;
import java.util.concurrent.ConcurrentSkipListSet;

class ConcurrentSkipListSetIteratorExample1 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        set.add(10);
        set.add(15);
        set.add(20);
        set.add(25);

        // Returns an iterator over the elements
        Iterator<Integer> iterator = set.descendingIterator();

        // Printing the elements of the set
        while (iterator.hasNext())
            System.out.print(iterator.next() + " ");
    }
}

Output:

25 20 15 10

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#descendingIterator--

ConcurrentSkipListSet descendingIterator() method in Java

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