Arraylist Implements Serializable

package example.set;
 
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
 
public class Copy {
    public static void main(String args[]) throws Exception {
	String elements[] = { "Irish Setter", "Poodle", "English Setter", "Gordon Setter", "Pug" };
	Set set = new HashSet(Arrays.asList(elements));
	Set set2 = ((Set) ((HashSet) set).clone());
	System.out.println(set2);
	FileOutputStream fos = new FileOutputStream("set.ser");
	ObjectOutputStream oos = new ObjectOutputStream(fos);
	oos.writeObject(set);
	oos.close();
	FileInputStream fis = new FileInputStream("set.ser");
	ObjectInputStream ois = new ObjectInputStream(fis);
	Set set3 = (Set) ois.readObject();
	ois.close();
	System.out.println(set3);
    }
}