ConcurrentSkipListSet clone() method in Java

// Java Program Demonstrate clone()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;

class ConcurrentSkipListSetCloneExample1 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<Integer>
            set = new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 15; i++)
            set.add(i);

        // Printing elements of the set
        System.out.println("The set contains: " + set);

        // Cloning the ConcurrentSkipListSet
        ConcurrentSkipListSet<Integer> clone_set = set.clone();

        // Adding elements to the clone set
        clone_set.add(16);

        // Printing elements of the clone set
        System.out.println("The clone set contains: " + clone_set);
    }
}

// Java Program Demonstrate clone()
// method of ConcurrentSkipListSet */
import java.util.concurrent.*;

class ConcurrentSkipListSetCloneExample2 {
    public static void main(String[] args)
    {

        // Initializing the set
        ConcurrentSkipListSet<String>
            set = new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        set.add("Gfg");
        set.add("is");
        set.add("fun");

        // Printing elements of the set
        System.out.println("The set contains: " + set);

        // Cloning the ConcurrentSkipListSet
        ConcurrentSkipListSet<String> clone_set = set.clone();

        // Adding elements to the clone set
        clone_set.add("site");

        // Printing elements of the clone set
        System.out.println("The clone set contains: " + clone_set);
    }
}