单选题Which interface must a class implement so that instances of the class are notified after any object is added to a session？ （）Ajavax.servlet.http.HttpSessionListenerBjavax.servlet.http.HttpSessionValueListenerCjavax.servlet.http.HttpSessionBindingListen
题目
单选题
Which interface must a class implement so that instances of the class are notified after any object is added to a session？ （）
A
javax.servlet.http.HttpSessionListener
B
javax.servlet.http.HttpSessionValueListener
C
javax.servlet.http.HttpSessionBindingListener
D
javax.servlet.http.HttpSessionAttributeListener