1.構(gòu)造器實(shí)例化（默認(rèn)無參構(gòu)造）

2.靜態(tài)工廠方法實(shí)例化

3.實(shí)例工廠方法實(shí)例化

2.靜態(tài)工廠方法實(shí)例化

因?yàn)?/p>

Calendar calendar = Calendar.getInstance();
所有在sPRing中可以這樣創(chuàng)建對象
<bean id="cal" class="java.util.Calendar", factory-method="getInstance"></bean>
String str="applicationContext.xml";ApplicationContext context = new ClassPathXmlApplicationContext(str);Calendar caleandar = context.getBean("cal",Calendar.class);
3.實(shí)例工廠方法實(shí)例化
String str="ApplicationContext.xml";ApplicationContext context = new ClassPathXmlApplicationContext(str);Calendar caleandar = context.getBean("cal",Calendar.class);