synchronized (urlloaders)
synchronized (this)
  public String toString()  {    synchronized (urlloaders)      {	if (thisString == null)	  {	    StringBuffer sb = new StringBuffer();	    sb.append(this.getClass().getName());	    sb.append("{urls=[" );	    URL[] thisURLs = getURLs();	    for (int i = 0; i < thisURLs.length; i++)	      {		sb.append(thisURLs[i]);		if (i < thisURLs.length - 1)		  sb.append(',');	      }	    sb.append(']');	    sb.append(", parent=");	    sb.append(getParent());	    sb.append('}');	    thisString = sb.toString();	  }	return thisString;      }  }