code: public void renderJavaStyle(StringBuilder sb) {
          sb.append("\tat ").append(fileName);
          if (lineNumber > -1) {
              sb.append(':').append(lineNumber);
          }
          if (functionName != null) {
              sb.append(" (").append(functionName).append(')');
          }
      }
docs: Render stack element in Java-inspired style:
  <code>    at fileName:lineNumber (functionName)</code>
  
  @param sb the StringBuilder to append to