ConcurrentSkipListSet higher() method in Java

// Java program to demonstrate higher()
// method of ConcurrentSkipListSet

import java.util.concurrent.*;

class ConcurrentSkipListSetHigherExample1 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<Integer>
            Lset = new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 50; i += 10)
            Lset.add(i);

        // Finding higher of 20 in the set
        System.out.println("The higher of 20 in the set: "
                           + Lset.higher(20));

        // Finding higher of 39 in the set
        System.out.println("The higher of 39 in the set: "
                           + Lset.higher(39));

        // Finding higher of 50 in the set
        System.out.println("The higher of 50 in the set: "
                           + Lset.higher(50));
    }
}

// Java program to demonstrate higher()
// method of ConcurrentSkipListSet

import java.util.concurrent.*;

class ConcurrentSkipListSetHigherExample1 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<Integer>
            Lset = new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 50; i += 10)
            Lset.add(i);

        try {
            // Trying to find higher of "null" in the set
            System.out.println("The higher of null in the set: "
                               + Lset.higher(null));
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}