Java html parser

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Java

HTML

Hi all, i have this code that i acquired help to parse a html web page and print all the <img> tag lines out.However, i'm having a slight issue with the codes.

import javax.swing.text.html.*;
import javax.swing.text.Element;
import javax.swing.text.ElementIterator;
import java.net.URL;
import java.io.InputStreamReader;
import java.io.Reader;

/**
 *  Extract all "img" tags from an HTML document.
 */
public class HTMLParser
{
  public static void main( String[] argv ) throws Exception
  {
    URL url = new URL( "http://java.sun.com" ); 
    HTMLEditorKit kit = new HTMLEditorKit(); 
    HTMLDocument doc = (HTMLDocument) kit.createDefaultDocument(); 
    doc.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
    Reader HTMLReader = new InputStreamReader(url.openConnection().getInputStream()); 
    kit.read(HTMLReader, doc, 0); 

    //  Get an iterator for all HTML tags.
    ElementIterator it = new ElementIterator(doc); 
    Element elem; 
    
    while( elem = it.next() != null  )
    { 
      if( elem.getName().equals(  "img") )
      { 
        String s = (String) elem.getAttributes().getAttribute(HTML.Attribute.SRC);
        if( s != null ) 
          System.out.println (s );
      } 
    }
    System.exit(0);
  }
} 

it keeps showing an error on the line

while( elem = it.next() != null  )

saying incompatible types. Anyone can help on this? thx in advance.