java.util.TreeSet.descendingSet() Method

Description

The descendingSet() method is used to return a reverse order view of the elements contained in this set.The descending set is backed by this set, so changes to the set are also reflected in the descending set and reverse.

Declaration

Following is the declaration for java.util.TreeSet.descendingSet() method.

public NavigableSet<E> descendingSet()

Parameters

NA

Return Value

The method call returns a reverse order view of this set.

Exception

NA

Example

The following example shows the usage of java.util.TreeSet.descendingSet() method.

package com.tutorialspoint;

import java.util.Iterator;
import java.util.TreeSet;

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

      // creating a TreeSet 
      TreeSet <Integer>treeadd = new TreeSet<Integer>();
      TreeSet <Integer>treereverse = new TreeSet<Integer>();

      // adding in the tree set
      treeadd.add(1);
      treeadd.add(13);
      treeadd.add(17);
      treeadd.add(2);

      // creating reverse set
      treereverse = (TreeSet)treeadd.descendingSet();

      // create descending set
      Iterator iterator;
      iterator = treereverse.iterator();

      // displaying the Tree set data
      System.out.println("Tree set data in reverse order: ");     
      
      while (iterator.hasNext()) {
         System.out.println(iterator.next() + " ");
      }
   }    
}

Let us compile and run the above program, this will produce the following result.

Tree set data in reverse order: 
17 
13 
2 
1 

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