Finding A URl on a Page Java Code --Java Programming: Solving Problems with Software

/**
 * Write a description of URLFINDER here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
import edu.duke.*;
import java.io.*;
public class URLFINDER
{
    public void asd(){
        URLResource file = new URLResource("http://www.dukelearntoprogram.com/course2/data/manylinks.html");
        for ( String item : file.words() ) {
            String itemLower = item.toLowerCase();
            int pos = itemLower.indexOf("youtube.com");
            if ( pos != -1 ) {
                int beg = item.lastIndexOf("\"", pos);
                int end = item.indexOf("\"", pos + 1);
                System.out.println(item.substring(beg + 1, end));
        }
    }
  }
}