code: public static boolean areValid(String... strings) {
  		boolean result = false;
  		if(strings != null) {
  			result = true;
  			for(String string : strings) {
  				result = result && isValid(string);
  			}
  		}
  		return result;
  	}
docs: Checks whether all the given strings are neither null nor blank.
  
  @param strings
  the strings to be checked.
  @return
  <code>true</code> if all the strings are not null and have some content
  besides blank spaces.