import java.util.HashSet;
public class HashSetMain {
public static void main(String[] args) {

// Create a new hash set of integers

HashSet <Integer> myHash = new HashSet <Integer>();

myHash.add(1);
myHash.add(2);
myHash.add(3);
myHash.add(4);
myHash.add(5);

HashSet<Integer> myHash2 = new HashSet<Integer>();

myHash2.add(4);
myHash2.add(5);
myHash2.add(6);
myHash2.add(7);
myHash2.add(8);

// code for union of the hashsets
myHash.addAll(myHash2);
System.out.println("Union of hash set 1 and 2: " + myHash);

// code for intersection of hashsets
myHash.retainAll(myHash2);
System.out.println("Intersection of hash set 1 and 2: " + myHash);

// code to find difference between two hashsets
myHash.removeAll(myHash2);
System.out.println("Difference of hash set 1 and 2: " + myHash);

// code to find if myHash2 is a subset of myHash
boolean subset = myHash.containsAll(myHash2);
System.out.println("myHash2 is a subset of myHash? " + subset);
}
}