import java.util.*;

public class HashSetExample {

public static void main(String[] args) {

HashSet s=new HashSet();

s.add("A");

s.add("B");

s.add("C");

s.add(null);//null insetion possible

s.add(10);//hetrogenous Object insetion possible

System.out.println(s.add("A"));//adding duplicate give false

System.out.println("\n______________\n");

System.out.println(s);

System.out.println("\nLinkedHashSet:\n");

//Linked HashSet in this insertion order preserved

LinkedHashSet s1 = new LinkedHashSet();

s1.add("A");

s1.add("B");

s1.add("C");

s1.add(null);// null insetion possible

s1.add(10);// hetrogenous Object insetion possible

System.out.println(s1.add("A"));// adding duplicate give false

System.out.println("______________");

System.out.println(s1);

}

}