spring的bean的init-method和 destroy-method=

<bean id="student" class="com.Student" init-method="init" destroy-method="close">
<constructor-arg ref="user"></constructor-arg>
<constructor-arg ref="user2"></constructor-arg>
</bean>

public void init()
{
System.out.println("init");
}

public void close()
{
System.out.println("close");
}