java how to remove duplicate element from an array

/**
 * @author lautturi.com
 * Java example: how to remove duplicates in an array
 */
import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		int[] numArray = { 11,4,12,7,55,8,12,8,13,55,12,7 };
		Set<Integer> set = new HashSet<>();
		for (Integer num : numArray) 
		{
		     if (set.add(num) == false) 
		     {
		        // duplicate element
		     }
		}
		
		Integer[] arr = set.toArray(new Integer[set.size()]);
		
		// print the new array without duplicate elements
		for (Integer i : arr) {
			System.out.print(i+" ");
		}
		
	}
}

output:

4 7 55 8 11 12 13