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import java.util.*;

public class Program117 {

//solve the Union of Two Arrays problem using Hashing in Java

public static void main(String[] args) {

int[] arr1 = {7, 3, 9};

int[] arr2 = {6, 3, 9, 2, 9, 4};

Set<Integer> unionSet = new HashSet<>();

// Add all elements from arr1

for (int num : arr1) {

unionSet.add(num);

}

// Add all elements from arr2

for (int num : arr2) {

unionSet.add(num);

}

// Print the union elements

System.out.println("Union of arrays: " + unionSet);

// Print the count

System.out.println("Count of unique elements (Union size): " + unionSet.size());

}

}