code: public static String getName(final Constructor<?> c) {
  		StringBuilder ret = new StringBuilder("(");
  		Class<?>[] parameterTypes = c.getParameterTypes();
  		for (int i = 0; i < parameterTypes.length; i++) {
  			if (i > 0)
  				ret.append(',');
  			ret.append(getName(parameterTypes[i]));
  		}
  		ret.append(')');
  		return ret.toString();
  	}
docs: get constructor name. "()", "(java.lang.String,int)"
  
  @param c
  constructor.
  @return name.