ConcurrentSkipListSet add() method in Java

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

import java.util.concurrent.*;

class ConcurrentSkipListSetAddExample1 {
    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);

        // Printing elements of the set
        System.out.println("The set contains: ");
        for (Integer i : Lset)
            System.out.print(i + " ");
    }
}

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

import java.util.concurrent.*;

class ConcurrentSkipListSetAddExample2 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<String> Lset = 
                     new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        Lset.add("alex");
        Lset.add("bob");
        Lset.add("chuck");
        Lset.add("drake");
        Lset.add("eric");

        // Printing elements of the set
        System.out.println("The set contains: ");
        for (String i : Lset)
            System.out.print(i + " ");
    }
}