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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.HttpSessionListenerB  javax.servlet.http.HttpSessionValueListenerC  javax.servlet.http.HttpSessionBinding

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

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相似问题和答案

第1题：

A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.  Which two are true？ （）

  • A、 A  element in the echo tag LTD must have the value JSP
  • B、 The echo tag handler must define the setAttribute （String key， String value） method
  • C、 The true element must appear in the echo tag TLD
  • D、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface
  • E、 The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface

正确答案:C,E

第2题：

Which interface must a class implement to be informed of a session creation event？（）

  • A、 javax.servlet.http.HttpSessionListener
  • B、 javax.servlet.http.HttpSessionBindingListener
  • C、 javax.servlet.http.HttpSessionCreationListener
  • D、 javax.servlet.http.HttpSessionActivationListener

正确答案:A

第3题：

Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo()method, which two statements are true?()

A.The class implements java.lang.Comparable.

B.The class implements java.util.Comparator.

C.The interface used to implement sorting allows this class to define only one sort sequence.

D.The interface used to implement sorting allows this class to define many different sort sequences.


参考答案：A, C

第4题：

Which interface must a session attribute implement if it needs to be notified when a web container persistsa session？（）

  • A、javax.servlet.http.HttpSessionListener
  • B、javax.servlet.http.HttpSessionBindingListener
  • C、javax.servlet.http.HttpSessionAttributeListener
  • D、javax.servlet.http.HttpSessionActivationListener

正确答案:D

第5题：

In your web application，you need to execute a block of code whenever the session object is first created. Which design will accomplish this goal？（）

  • A、Create an HttpSessionListener class and implement the sessionInitialized method with that block ofcode.
  • B、Create an HttpSessionActivationListener class and implement the sessionCreated method with thatblock of code.
  • C、Create a Filter class， call the getSession（false） method， and if the result was null， then execute that block of code.
  • D、Create an HttpSessionListener class and implement the sessionCreated method with that block of code.

正确答案:D

第6题：

Your web application requires the adding and deleting of many session attributes during a complex usecase. A bug report has come in that indicates that an important session attribute is being deleted too soonand a NullPointerException is being thrown several interactions after the fact. You have decided to create asession event listener that will log when attributes are being deleted so you can track down when theattribute is erroneously being deleted. Which listener class will accomplish this debugging goal？（）

  • A、Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
  • B、Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.
  • C、Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
  • D、Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.

正确答案:B

第7题：

Which interface must a class implement so that instances of the class are notified after any object is addedto a session？（）

  • A、javax.servlet.http.HttpSessionListener
  • B、javax.servlet.http.HttpSessionValueListener
  • C、javax.servlet.http.HttpSessionBindingListener
  • D、javax.servlet.http.HttpSessionAttributeListener

正确答案:D

第8题：

Given:Which statement is true about the class of an object that can reference the variable base? ()

A.It can be any class.

B.No class has access to base.

C.The class must belong to the geometry package.

D.The class must be a subclass of the class Hypotenuse.


参考答案：C

第9题：

Which statements concerning the methods notify（） and notifyAll（） are true？  

  • A、Instances of class Thread have a method called notify（）.
  • B、A call to the method notify（） will wake the thread that currently owns the monitor of the object.
  • C、The method notify（） is synchronized.
  • D、The method notifyAll（） is defined in class Thread.
  • E、When there is more than one thread waiting to obtain the monitor of an object， there is no way to be     sure which thread will be notified by the notify（） method.

正确答案:A,E

第10题：

package geometry；  public class Hypotenuse {  public InnerTriangle it = new InnerTriangle（）；  class InnerTriangle {  public int base；  public int height；  }  }  Which is true about the class of an object that can reference the variable base？ （）

  • A、 It can be any class.
  • B、 No class has access to base.
  • C、 The class must belong to the geometry package.
  • D、 The class must be a subclass of the class Hypotenuse.

正确答案:C

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