remove duplicate string collection in java

/**
 * @author lautturi.com 
 * Java example: remove duplicates in java string collection 
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		String str = "HELLO WORLD java world";
		String[] arr = str.split("");
		str = new LinkedHashSet<>(Arrays.asList(arr)).toString().replace(", ", "");
		System.out.println(str);

	}
}