remove duplicate words from string in java

/**
 * @author lautturi.com 
 * Java example: remove duplicate words in a java string
 */


import java.util.*;
import java.util.regex.Pattern;

public class Lautturi {

	public static <T> ArrayList<T> removeDuplicates(ArrayList<T> list) {
		Set<T> set = new LinkedHashSet<>(list);
		return new ArrayList<T>(set);
	}

	public static void main(String[] args) {
		String string = "hi Java world,lauttur learning java. Java is a programming language";

		String[] words = string.split("\\W+");
		StringBuilder stringBuilder = new StringBuilder();
		Set<String> wordsHashSet = new HashSet<>();
		for (String word : words) {
			if (wordsHashSet.contains(word.toLowerCase()))
				continue;
			wordsHashSet.add(word.toLowerCase());
			stringBuilder.append(word).append(" ");
		}
		String newString = stringBuilder.toString().trim();
		
		System.out.println(string);
		System.out.println(newString);
	}
}

output:

hi Java world,lauttur learning java. Java is a programming language
hi Java world lauttur learning is a programming language