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How to sort TreeSet in descending order in Java?

  • Difficulty Level : Basic
  • Last Updated : 22 Oct, 2020

Given a TreeSet in Java, task is to sort elements of TreeSet in Descending Order (descreasing order).
Examples: 

Input : Set: [2, 3, 5, 7, 10, 20]
Output : Set: [20, 10, 7, 5, 3, 2]

Input : Set: [computer, for, geeks, hello]
Output : Set: [hello, geeks, for, computer]

Approach: 
To make a TreeSet Element in decreasing order, simple use descendingSet() method which is used to change the order of TreeSet in reverse order
Below is the implementation of the above approach: 

Java




// Java Program to print TreeSet in reverse Order
import java.util.TreeSet;
 
public class TreeSetDescending
{
 
    public static void main(String[] args)
    {
        // Declare a treeset
        TreeSet<Object> ints = new TreeSet<Object>();
        ints.add(2);
        ints.add(20);
        ints.add(10);
        ints.add(5);
        ints.add(7);
        ints.add(3);
 
        // Initialize treeset with
        // predefined set in reverse order
        // using descendingSet()
        TreeSet<Object> intsReverse =
            (TreeSet<Object>)ints.descendingSet();
 
        // Print the set
        System.out.println("Without descendingSet(): " +
                                                 ints);
        System.out.println("With descendingSet(): " +
                                           intsReverse);
    }
}
Output
Without descendingSet(): [2, 3, 5, 7, 10, 20]
With descendingSet(): [20, 10, 7, 5, 3, 2]

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