code: public String getString(String key, Object[] args) {
          String value = getString(key);
          return MessageFormat.format(value, args);
      }
docs: Gets the String associated with <code>key</code> after having resolved
  any nested keys ({@link #resolve(String)}) and applied a formatter using
  the given <code>args</code>.
  
  @param key the key to lookup
  @param args the arguments to pass to the formatter
  @return the String associated with <code>key</code>