code: public static String getConstructorDescriptor(final Constructor<?> c) {
          Class<?>[] parameters = c.getParameterTypes();
          StringBuffer buf = new StringBuffer();
          buf.append('(');
          for (int i = 0; i < parameters.length; ++i) {
              getDescriptor(buf, parameters[i]);
          }
          return buf.append(")V").toString();
      }
docs: Returns the descriptor corresponding to the given constructor.
  
  @param c
  a {@link Constructor Constructor} object.
  @return the descriptor of the given constructor.