code: public static void main(final String[] args) throws Throwable {
  		final Preferences config = Preferences.systemNodeForPackage(Example.class);
  		System.out.println(config.get("mykey", "my-default-value1"));
  		System.out.println(config.get("mykey2", "my-default-value2"));
  		System.out.println(config.get("other.key", "my-default-value3"));
  		System.out.println(config.get("urlbase", "my-default-value4"));
  		System.out.println(config.get("urlsearch", "my-default-value5"));
  	}
docs: Simple Test