JSoup crawler variation

Brokens.java

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

public class Brokens 
{

	static boolean broken(String url)
	{
	    try {
	    	Jsoup.connect(url).get(); 
	    	return false;
	    }
	    catch (java.net.MalformedURLException e) {
	    	return true;
	    }	
		catch (IOException e){
			if (e.toString().contains("java.io.IOException: 404")) return true;
			return false; //this means it exists but isn't html     
		}
		catch(Exception e) {	
			return false; 
		//for any other errror assume not broken - this is a guess
		}
	}		

	static HashSet<String>  links (String url)
	{
		HashSet<String> a= new HashSet<String>();
		try{

			org.jsoup.Connection z=Jsoup.connect(url);
	        Document doc = z.get();
		   	Elements links = doc.select("a[href]");
	        for (Element link : links) a.add(link.attr("abs:href"));
		   
		   }
		   catch (Exception e)
		   {
		   
		   }
		 return a;  
	}



	static  void Spider (String url, int n, String contains)
	{
		  HashSet<String> alreadyVisited = new HashSet <String> ();
	      HashSet<String> toVisit = new HashSet <String> ();
		  toVisit.addAll(links(url));
		  alreadyVisited.add(url);  
		  int i=0;
		  while (i<n && !toVisit.isEmpty())
		  {
		  	
			String z= toVisit.iterator().next();
		    boolean already=alreadyVisited.contains(z);
			if (already) toVisit.remove(z);
			else 
			{
			  if (z.contains(contains))
			  {
			    System.out.println(z);
			    HashSet <String> k= links(z);
			    toVisit.addAll(k);
			  }
			  alreadyVisited.add(z);
			  i++;
			}  
		  }
		  
		  for (String k:alreadyVisited)
		  if (broken(k)) System.out.println("Broken: " +k);
	}

    public static void main(String[] args) throws IOException 
	{
        String url = args[0];
	   	Spider(url,100,args[1]);           
		   
    }
}