You can use the first() and last() methods of TreeSet to get the elements at the ends of the tree:
public Object first() public Object last()
The first() element is the one that is ordered first in the set, while last() is last.
A NoSuchElementException will be thrown by either method if there are no elements in the set.
import java.util.Arrays; import java.util.Set; import java.util.TreeSet; public class MainClass { public static void main(String args[]) throws Exception { String elements[] = { "A", "C", "D", "G", "F" }; TreeSet set = new TreeSet(Arrays.asList(elements)); System.out.println(set); System.out.println(set.first()); System.out.println(set.last()); } }
[A, C, D, F, G] A G