E first()

// A Java program to demonstrate
// working of SortedSet
 
import java.util.SortedSet;
import java.util.TreeSet;
 
public class Main {
    public static void main(String[] args)
    {
        // Create a TreeSet and inserting elements
        SortedSet<Integer> s = new TreeSet<>();
 
        // Adding Element to SortedSet
        s.add(1);
        s.add(5);
        s.add(2);
        s.add(3);
        s.add(9);
 
        // Returning the lowest element from set
        System.out.print("Lowest element in set is : "
                         + s.first());
    }
}

Lowest element in set is : 1

// Program to illustrate the first()
// method of SortedSet interface
 
import java.util.SortedSet;
import java.util.TreeSet;
 
public class GFG {
    public static void main(String args[])
    {
        // Create an empty SortedSet
        SortedSet<Integer> s = new TreeSet<>();
 
        // Trying to access element from
        // empty set
        try {
            s.first();
        }
        catch (Exception e) {
            // throws NoSuchElementException
            System.out.println("Exception: " + e);
        }
    }
}

Exception: java.util.NoSuchElementException