Looping through a sorted set backwards : TreeSet « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. TreeSet

import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.TreeSet;

public class MainClass {

  public static void main(String[] a) {

    String[] elements = new String[] { "A", "B", "C", "D" };

    TreeSet set = new TreeSet(Arrays.asList(elements));

    try {
      Object last = set.last();
      boolean first = true;
      while (true) {
        if (!first) {
          System.out.print(", ");
        }
        System.out.println(last);
        last = set.headSet(last).last();
      }
    } catch (NoSuchElementException e) {
      System.out.println();
    }
  }
}

D
C
B
A