How can you create a listener class that receives events whe

题目
单选题
How can you create a listener class that receives events when the mouse is moved?()
A

 By extending MouseListener.

B

 By implementing MouseListener.

C

 By extending MouseMotionListener.

D

 By implementing MouseMotionListener.

E

 Either by extending MouseMotionListener or extending MouseListener.

F

 Either by implementing MouseMotion Listener or implementing MouseListener.

参考答案和解析
正确答案: D
解析: 暂无解析
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相似问题和答案

第1题:

—_______ are you going on a visit to Beijing? 学科网 —We’ll drive there.学科网A. Whe

—_______ are you going on a visit to Beijing?

—We’ll drive there.

A. When B.How C.Why


正确答案:B

第2题:

You create an application. The application processes hundreds of XML documents per minute. The XML documents are validated against inline schemas. You need to load XML documents from the file system and read them as quickly as possible. XML comments must be ignored while reading the XML documents.What should you do? ()

  • A、Create an instance of the XmlReader class by using the XmlReader Create method with an instance of the XmlReaderSettings class.
  • B、Create an instance of the XmlReader class with an instance of the XmlTextReader class.
  • C、Create an instance of the XmlDocument class and specify a location for the application schema.
  • D、Create an instance of the XmlReader class with an instance of the XmlNodeReader class.

正确答案:A

第3题:

How many usable IP addresses can you get from a conventional Class C address?

A.128

B.192

C.254

D.256

E.510


正确答案:C
解析:Explanation:
Class Caddresses range from 192.0.0.0 through 223.225.225.225 and default subnet maskof 255.255.255.0. In Class C addresses, the first 24 bits are used as for the network IDwhile only the last 8 bits is used for the host ID. Using the 2n-2 formula, we can calculate that Class C addresses can support a maximum of 254 (28-2) hosts.

Incorrect Answers:
D. Note that the question asked for the number of usable addresses, and not the total number of all addresses. We must subtract 2 for the network and broadcast addresses to calculate the number of usable addresses in any subnet.

第4题:

The listener has shut down unexpectedly. You want to view the listener log file and listener trace file to find the cause of the problem. How can you view the contents of the listener log file and the listener trace file?()

  • A、 Open the file at the location specified by the BACKGROUND_DUMP_DEST parameter in the pfile.
  • B、 Open the file at the location specified by the USER_DUMP_DEST parameter in the pfile.
  • C、 Issue the SERVICES command at the LSNRCTL> prompt.
  • D、 Issue the STATUS command at the LSNRCTL> prompt.

正确答案:D

第5题:

How can you create a listener class that receives events when the mouse is moved?()  

  • A、 By extending MouseListener.
  • B、 By implementing MouseListener.
  • C、 By extending MouseMotionListener.
  • D、 By implementing MouseMotionListener.
  • E、 Either by extending MouseMotionListener or extending MouseListener.
  • F、 Either by implementing MouseMotion Listener or implementing MouseListener.

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:

How many usable IP addresses can you get from a conventional Class C address?()

  • A、128
  • B、192
  • C、254
  • D、256
  • E、510

正确答案:C

第8题:

how can you create good vacuum on the fresh water (FW) distiller ?


正确答案:First of all ,to create good vacuum on the FW distiller .i must make sure that the internal chamber is sealed against possible entrance of the air during operation .secondly ,the air ejector and ejector pump should be in good condition .thirdly ,some revelant valves parking should be sealed against air leakage ,lastly ,the unit should be free from scales (水垢) 。both on its condenser and heater .

第9题:

You want to schedule a job to rebuild all indexes on the SALES table after the completion of a bulk load operation. The bulk load operation must also be a scheduled job that executes as soon as the first file that contains data arrives on the system. How would you create these jobs?()

  • A、Create both jobs by using events raised by the scheduler
  • B、Create both jobs by using events raised by the application
  • C、Create a job to rebuild indexes by using events arised by the application and then create another job to perform bulk load by using events raised by the scheduler
  • D、Create a job to rebuild indexes by using events arised by the Scheduler and then create another job to perform bulk load by using events raised by the application

正确答案:D

第10题:

You are required to remove the default EXTPROC entry from the default listener configuration to create a listener that will listen specifically for EXTPROC calls. Which two methods can you use to remove the default EXTPROC entry from the default listener configuration? ()

  • A、 the RMAN utility
  • B、 the import/export utility
  • C、 the Oracle Enterprise Manager
  • D、 the change tracking feature
  • E、 the Net Manager utility

正确答案:C,E

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