Using a HashSet and JSoup to process a List or URLs

HashSetExample.java

import java.util.*; 
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;

class HashSetExample { 

  static Set<String> urlsProcessed = new HashSet<String>();
	
  public static void main(String args[]) throws Exception {  
    List<String> toProcess = new ArrayList<String>(); 
    toProcess.add("http://bbc.co.uk");
    toProcess.add("http://wikipedia.com");
    toProcess.add("http://example.com");
    processURLs(toProcess);
  }  

  public static void processURLs(List<String> urls) throws IOException {
    for (String url : urls) {
      if (!urlsProcessed.contains(url)) {
        Document doc = Jsoup.connect(url).get();
        Elements title = doc.getElementsByTag("title");
        System.out.println(title.text());
        urlsProcessed.add(url);
      }
    }
  }
}