Collections.reverseOrder() TreeSet

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import java.util.Set;

import java.util.TreeSet;

 

/**

 *

 */

public class NewClass {

    public static void main(String[] args) {

        List<Integer> list = new ArrayList<Integer>(Arrays.asList(5,1,2,7,1));

        System.out.println(list);

       Set<Integer> set = new TreeSet<>();

       set.addAll(list);

       System.out.println(set);

       TreeSet treeSet = new TreeSet(Collections.reverseOrder());

       treeSet.addAll(list);

       System.out.println(treeSet);

    }

}