public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("Stage.xml");
		Stage stage = (Stage)context.getBean("stage");
		stage.embark(); // I'm unique stage
		
		stage.setDescription("Wei Jingjing");
		
		ApplicationContext context_2 = new ClassPathXmlApplicationContext("Stage.xml");
		Stage stage_2 = (Stage)context_2.getBean("stage");
		stage_2.embark(); // I'm Wei Jingjing
		
		// stage and stage_2 are the same reference to Stage
	}