private String mkStr(char kar, int num) {
   StringBuffer sb = new StringBuffer(num);
   for (int ix = 0; ix < num; ix++) {
     sb.append(kar);
   }
   return sb.toString();
 }
 public String toString() {
   StringBuffer sb = new StringBuffer(url.length() + 17);
   sb.append("[MyMockCachedUrl: ");
   sb.append(url);
   sb.append("]");
   return sb.toString();
 }
 private String makeContent(String url, String openTag, String closeTag) {
   StringBuffer sb = new StringBuffer(100);
   sb.append("<html><head><title>Test</title></head><body>");
   sb.append(openTag);
   sb.append(url);
   sb.append(">");
   sb.append(closeTag);
   sb.append("</body></html>");
   return sb.toString();
 }